Displaying VLANs, Configuring Vlan Trunks | Cisco Systems 3750E

Chapter 13 Configuring VLANs

Displaying VLANs

Displaying VLANs

Use the show vlan privileged EXEC command to display a list of all VLANs on the switch, including extended-range VLANs. The display includes VLAN status, ports, and configuration information. To view normal-range VLANs in the VLAN database (1 to 1005), use the show VLAN database configuration command (accessed by entering the vlan database privileged EXEC command).

Table 13-3lists the commands for monitoring VLANs.

Table 13-3	VLAN Monitoring Commands

Command		Command Mode	Purpose

show		VLAN database	Display status of VLANs in the VLAN database.
		configuration

show current [vlan-id]		VLAN database	Display status of all or the specified VLAN in the
		configuration	VLAN database.

show interfaces [vlan		Privileged EXEC	Display characteristics for all interfaces or for
vlan-id]			the specified VLAN configured on the switch.

show vlan [id vlan-id]		Privileged EXEC	Display parameters for all VLANs or the
			specified VLAN on the switch.

For more details about the show command options and explanations of output fields, see the command reference for this release.

Configuring VLAN Trunks

These sections contain this conceptual information:

•Trunking Overview, page 13-16

•Encapsulation Types, page 13-18

•Default Layer 2 Ethernet Interface VLAN Configuration, page 13-19

•Configuring an Ethernet Interface as a Trunk Port, page 13-19

•Configuring Trunk Ports for Load Sharing, page 13-24

Trunking Overview

Atrunk is a point-to-point link between one or more Ethernet switch interfaces and another networking device such as a router or a switch. Ethernet trunks carry the traffic of multiple VLANs over a single link, and you can extend the VLANs across an entire network.

Two trunking encapsulations are available on all Ethernet interfaces:

•Inter-Switch Link (ISL)—Cisco-proprietary trunking encapsulation.

•IEEE 802.1Q— industry-standard trunking encapsulation.

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
13-16	OL-9775-02

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Cisco Systems 3750E Displaying VLANs, Configuring Vlan Trunks, Trunking Overview, Command Command Mode Purpose, 13-16

Contents

Americas Headquarters Text Part Number OL-9775-02Page N T E N T S Iii Assigning the Switch IP Address and Default Gateway Understanding Cisco Configuration Engine Software Clustering Switches Catalyst 1900 and Catalyst 2820 CLI Considerations Vii Creating a Banner Viii Changing the Default Privilege Level for Lines Device Roles Bypass Routed Ports Xii Monitoring and Maintaining the Interfaces Xiii Encapsulation Types Xiv Domain Names Private-VLAN Configuration Guidelines Xvi Disabled State Xvii Boundary Ports Xviii Xix 19-25 Dhcp Server Configuring Dynamic ARP Inspection Xxi Configuring MVR Xxii Understanding Storm Control Xxiii Understanding Udld Modes of Operation Xxiv Creating an Rspan Source Session Xxv Snmp Agent Functions Xxvi Creating a Numbered Extended ACL Xxvii Interaction with Other Features and Switches Xxviii Xxix Port-Channel Interfaces Xxx Configuring IP Addressing Xxxi Nonstop Forwarding Awareness Xxxii IPv6 Addresses Xxxiii Configuring Hsrp Priority Xxxiv Configuring IP Multicast Routing Xxxv Configuring Basic Dvmrp Interoperability Features Xxxvi Using a Filter Xxxvii Xxxviii 45-14 Configuring Online Diagnostics Xxxix Unsupported Route-Map Configuration Commands C-1 Hsrp Xli VTP Xlii Preface AudiencePurpose Conventions Related Publications Xliv Xlv Xlvi Features Overview Deployment Features Availability and Redundancy Features, Vlan Features, Overview Features Performance Features Management Options Manageability Features Availability and Redundancy Features Vlan Features Security Features Overview Features QoS and CoS Features Layer 3 Features Power over Ethernet Features Default Settings After Initial Switch Configuration Monitoring FeaturesVlan Overview Default Settings After Initial Switch Configuration Overview Default Settings After Initial Switch Configuration Network Configuration Examples Design Concepts for Using the Switch Network Demands Suggested Design Methods Cost-Effective Wiring Closet High-Performance Wiring Closet High-Performance Workgroup Gigabit-to-the-Desktop Redundant Gigabit Backbone Server Aggregation Linux Server Cluster Cisco SoftPhone Software Gigabit servers Internet Cisco 2600 or 3700 routers Catalyst 3560-E switches Large Network Using Catalyst 3750-E and 3560-E Switches Cisco 7x00 routers Catalyst Catalyst 3560-E Multidwelling Network Using Catalyst 3750-E Switches Long-Distance, High-Bandwidth Transport Configuration 11 Catalyst 3750-E Switches in a MAN Configuration Where to Go Next Access layer Aggregation layer OL-9775-02 Using the Command-Line Interface Understanding Command Modes Mode Access Method Prompt Exit Method About This Mode ConfigureQuit Ctrl-Z Console command Command PurposeUnderstanding the Help System Line vty or line Understanding Abbreviated Commands Understanding no and default Forms of CommandsCommand ? Command keyword ? Understanding CLI Error Messages Using Configuration LoggingError Message Meaning How to Get Help Using Command History Changing the Command History Buffer SizeRecalling Commands Action1 Result Using Editing Features Disabling the Command History FeatureEnabling and Disabling Editing Features Switch# terminal editing Editing Commands through Keystrokes Capability Keystroke1 Purpose Editing Command Lines that Wrap Return and Space barPress Ctrl-L or Ctrl-R Accessing the CLI Command begin include exclude regular-expressionSwitch# show interfaces include protocol Using the Command-Line Interface Accessing the CLI OL-9775-02 Assigning the Switch IP Address and Default Gateway Understanding the Boot Process Assigning Switch Information Default Switch Information Understanding DHCP-Based AutoconfigurationFeature Default Setting Dhcp Client Request Process Dhcp Client and Server Message Exchange Configuring DHCP-Based Autoconfiguration Dhcp Server Configuration Guidelines Configuring the Tftp Server Configuring the DNS Configuring the Relay Device Obtaining Configuration FilesRouterconfig-if#ip helper-address Example Configuration Tftpserver Switch a Switch B Switch C Switch D DNS Server ConfigurationTftp Server Configuration on Unix Dhcp Client Configuration Manually Assigning IP Information Checking and Saving the Running Configuration Switch# show running-configSwitch# copy running-config startup-config Modifying the Startup Configuration Default Boot ConfigurationAutomatically Downloading a Configuration File Booting Manually Boot config-file flash/ file-urlShow boot Configure terminal Enter global configuration mode Booting a Specific Software Image Boot system filesystem /file-url Boot system switch number all Controlling Environment Variables Set Manualboot yes Boot manual Set SwitchnumberSwitch current-stack-member-number renumber Set Switchpriority Configuring a Scheduled Reload Scheduling a Reload of the Software ImageVariable Description Reload in hhmm text Switch# reload at Switch# reload at 0200 junDisplaying Scheduled Reload Information Configuring Cisco IOS CNS Agents Understanding Cisco Configuration Engine Software Configuration Service Configuration Engine Architectural Overview Event Service ConfigIDWhat You Should Know About the CNS IDs and Device Hostnames NameSpace Mapper Using Hostname, DeviceID, and ConfigID DeviceIDHostname and DeviceID Initial Configuration Understanding Cisco IOS Agents Configuring Cisco IOS Agents Incremental Partial ConfigurationSynchronized Configuration Enabling Automated CNS Configuration Device Required Configuration Backup init-retry retry-count keepalive seconds Show running-configEnabling the CNS Event Agent Show cns event connections Enabling an Initial Configuration Enabling the Cisco IOS CNS Agent Cns config initial ip-address hostname Cns id interface num dns-reverse ipaddressMac-address event Cns id hardware-serial hostname string string Enabling a Partial Configuration Show running-config Verify your entriesCns config partial ip-address hostname Show cns config stats Displaying CNS Configuration Show cns config connectionsShow cns event stats Show cns event subject Managing Switch Stacks Understanding Switch Stacks Managing Switch Stacks Understanding Switch Stacks Switch Stack Membership Creating a Switch Stack from Two Standalone Switches Adding a Standalone Switch to a Switch Stack Stack Master Election and Re-Election Switch Stack Bridge ID and Router MAC Address Stack Member Numbers Stack Member Priority Values Switch Stack Offline Configuration Effects of Adding a Provisioned Switch to a Switch StackScenario Result Scenario Result Switch Stack Software Compatibility Recommendations Effects of Replacing a Provisioned Switch in a Switch Stack Major Version Number Incompatibility Among Switches Minor Version Number Incompatibility Among SwitchesStack Protocol Version Compatibility Understanding Auto-Upgrade and Auto-Advise Auto-Upgrade and Auto-Advise Example Messages SwitchDirectory Mar 1 000422.537%IMAGEMGR-6-AUTOADVISESW Incompatible Software and Stack Member Image Upgrades Switch Stack Configuration Files Switch Stack Management Connectivity Connectivity to the Switch Stack Through an IP Address Connectivity to the Switch Stack Through an SSH SessionConnectivity to Specific Stack Members Switch Stack Configuration Scenarios Use the switch stack-member-numberPriority new-priority-number global Current-stack-member-number Renumber new-stack-member-number Configuring the Switch Stack Default Switch Stack ConfigurationEnabling Persistent MAC Address Stack-mac persistent timer Show switchSwitchconfig# stack-mac persistent timer Time-value Setting the Stack Member Priority Value Assigning Stack Member InformationAssigning a Stack Member Number Provisioning a New Member for a Switch Stack Accessing the CLI of a Specific Stack Member Displaying Switch Stack InformationCommand Description Show switch stack-member-number Show switch stack-ports Show switch stack-ring activityDetail OL-9775-02 Clustering Switches Understanding Switch Clusters Switch Cisco IOS Release Cluster Capability Cluster Command Switch Characteristics Standby Cluster Command Switch Characteristics Planning a Switch Cluster Candidate Switch and Cluster Member Switch Characteristics Automatic Discovery of Cluster Candidates and Members Discovery Through CDP Hops Discovery Through CDP Hops Discovery Through Different VLANs Discovery Through Different Management VLANs Discovery Through Different VLANs Discovery Through Routed Ports Discovery of Newly Installed Switches New out-of-box Hsrp and Standby Cluster Command Switches Virtual IP Addresses Other Considerations for Cluster Standby Groups Automatic Recovery of Cluster Configuration IP Addresses Hostnames Passwords Snmp Community Strings Switch Clusters and Switch Stacks Switch Stack Switch ClusterMembers Other cluster member switches TACACS+ and Radius LRE Profiles Using the CLI to Manage Switch Clusters Switch# rcommandCatalyst 1900 and Catalyst 2820 CLI Considerations Using Snmp to Manage Switch Clusters Snmp Management for a Cluster OL-9775-02 Administering the Switch Managing the System Time and DateUnderstanding the System Clock Understanding Network Time Protocol NTP Configuring NTP Typical NTP Network Configuration Default NTP Configuration Configuring NTP AuthenticationNtp authenticate Configuring NTP Associations Configuring NTP Broadcast Service Switchconfig# ntp server 172.16.22.44 versionNtp peer ip-address version number Key keyid source interface prefer Interface interface-id Ntp broadcast version number key keyidDestination-address Ntp broadcast client Configuring NTP Access Restrictions Ntp broadcastdelay microsecondsNtp access-group query-only Serve-onl y serve peer Command Purpose Configuring the Source IP Address for NTP Packets Interface interface-id Configuring Time and Date Manually Displaying the NTP ConfigurationSetting the System Clock Fundamentals Command Reference, Release Displaying the Time and Date Configuration Configuring the Time ZoneClock timezone zone hours-offset Minutes-offset Configuring Summer Time Daylight Saving Time Clock summer-time zone recurringWeek day month hh mm week day month Hh mm offset Configuring a System Name and Prompt Clock summer-time zone date monthClock summer-time zone date date Default System Name and Prompt Configuration Configuring a System NameCopy running-config startup-confi g Understanding DNS Default DNS Configuration Setting Up DNSIp domain-name name Ip name-server server-address1 Default Banner Configuration Displaying the DNS ConfigurationCreating a Banner Configuring a Message-of-the-Day Login Banner Banner motd c message cUnix telnet Configuring a Login Banner Banner login c message cManaging the MAC Address Table Building the Address Table MAC Addresses and VLANs MAC Addresses and Switch Stacks Default MAC Address Table ConfigurationChanging the Address Aging Time Configuring MAC Address Notification Traps Removing Dynamic Address EntriesMac address-table aging-time Show mac address-table aging-time String by using the snmp-server community Snmp-server enable traps mac-notificationSnmp-server host host-addr traps informs version Mac address-table notification Adding and Removing Static Address Entries Configuring Unicast MAC Address Filtering Mac address-table static mac-addrVlan vlan-id interface interface-id Show mac address-table static Vlan vlan-id drop Managing the ARP Table Displaying Address Table Entries OL-9775-02 Configuring SDM Templates Understanding the SDM Templates Resource Access Default Routing Dual IPv4 and IPv6 SDM Templates SDM Templates and Switch Stacks IPv4-and-IPv6 Resource Default Routing Configuring the Switch SDM Template Default SDM TemplateSDM Template Configuration Guidelines Setting the SDM Template Sdm prefer access defaultDual-ipv4-and-ipv6 default routing Vlan routing vlan Switchconfig# sdm prefer routing Switchconfig# sdm prefer dual-ipv4-and-ipv6 defaultDisplaying the SDM Templates Policy based routing aces 25K OL-9775-02 Configuring Switch-Based Authentication Preventing Unauthorized Access to Your Switch Protecting Access to Privileged Exec Commands Default Password and Privilege Level Configuration Setting or Changing a Static Enable Password Enable password passwordSwitchconfig# enable password l1u2c3k4y5 Enable password level level password Encryption-type encrypted-passwordEnable secret level level password Service password-encryption Disabling Password Recovery No service password-recoveryShow version Setting a Telnet Password for a Terminal Line Configuring Username and Password PairsPassword password Switchconfig-line#password let45me67in89 Configuring Multiple Privilege Levels Username commandLogin local Username name privilege level Setting the Privilege Level for a Command Privilege mode level level commandShow privilege Changing the Default Privilege Level for Lines CommandLogging into and Exiting a Privilege Level Controlling Switch Access with TACACS+ Understanding TACACS+ Typical TACACS+ Network Configuration Configuring TACACS+ TACACS+ Operation Default TACACS+ Configuration Tacacs-server host hostname portAaa new-model Aaa group server tacacs+ group-name Configuring TACACS+ Login Authentication Aaa new-model Enable AAAShow tacacs Verify your entries Aaa authentication login default Login authentication defaultAuthentication login command Line console tty vty line-number Show running-config Verify your entries Controlling Switch Access with Radius Displaying the TACACS+ ConfigurationStarting TACACS+ Accounting Understanding Radius Transitioning from Radius to TACACS+ Services Radius Operation Configuring Radius Default Radius ConfigurationIdentifying the Radius Server Host Page Acct-port port-number timeout Radius-server host hostnameIp-address auth-port port-number Seconds retransmit retries key Configuring Radius Login Authentication Switchconfig# radius-server host host1 Server Host section on Defining AAA Server Groups Aaa group server radius group-name Aaa authorization network radius Radius Starting Radius Accounting Configuring Settings for All Radius Servers Radius-server timeout secondsRadius-server key string Radius-server retransmit retries Authentication Radius-server vsa send accountingCisco-avpair=shellpriv-lvl=15 Cisco-avpair=ipoutacl#2=deny ip 10.10.10.10 0.0.255.255 any Controlling Switch Access with Kerberos Displaying the Radius ConfigurationRadius-server host hostname ip-address non-standard Understanding Kerberos Term Definition KDC Authenticating to a Boundary Switch Kerberos OperationKeytab Srvtab Configuring Kerberos Authenticating to Network ServicesObtaining a TGT from a KDC Aaa authentication login default local Aaa authorization exec localAaa authorization network local Configuring the Switch for Secure Shell Username commandUsername name privilege level Understanding SSH SSH Servers, Integrated Clients, and Supported Versions Configuring SSH Configuration GuidelinesLimitations Setting Up the Switch to Run SSH Displaying the SSH Configuration and Status Configuring the SSH ServerIp ssh timeout seconds Authentication-retries number Configuring the Switch for Secure Socket Layer Http Understanding Secure Http Servers and ClientsCertificate Authority Trustpoints Rsakeypair TP-self-signed-3080755072 Configuring Secure Http Servers and Clients Default SSL ConfigurationCipherSuites SSL Configuration Guidelines Configuring a CA Trustpoint Configuring the Secure Http Server Configuring the Secure Http Client Ip http timeout-policy idle seconds lifeShow ip http server secure status Ip http client secure-trustpoint name Configuring the Switch for Secure Copy Protocol Displaying Secure Http Server and Client StatusIp http client secure-ciphersuite Show ip http client secure status Information About Secure Copy Html OL-9775-02 Configuring Ieee 802.1x Port-Based Authentication Understanding Ieee 802.1x Port-Based Authentication10-1 Device Roles 10-2 Authentication Process 10-3 Authentication Flowchart 10-4 Authentication Initiation and Message Exchange 10-5 10-6 EAPOL-Start Ieee 802.1x Authentication and Switch Stacks Ports in Authorized and Unauthorized States10-7 Ieee 802.1x Host Mode 10-8 Ieee 802.1x Accounting Ieee 802.1x Accounting Attribute-Value PairsAttribute Number AV Pair Name 10-9 Using Ieee 802.1x Authentication with Vlan Assignment 10-10 Using Ieee 802.1x Authentication with Per-User ACLs 10-11 Using Ieee 802.1x Authentication with Guest Vlan 10-12 Using Ieee 802.1x Authentication with Restricted Vlan 10-13 10-14 Using Ieee 802.1x Authentication with Voice Vlan Ports 10-15 Using Ieee 802.1x Authentication with Port Security 10-16 Using Ieee 802.1x Authentication with Wake-on-LAN 10-17 10-18 Using Multidomain Authentication Network Admission Control Layer 2 Ieee 802.1x Validation10-19 Using Web Authentication For example10-20 Configuring Ieee 802.1x Authentication 10-21 Default Ieee 802.1x Authentication Configuration AAA10-22 Ieee 802.1x Authentication Configuration Guidelines Ieee 802.1x Authentication10-23 10-24 Configuring Ieee 802.1x Authentication MAC Authentication Bypass10-25 Configuring the Switch-to-RADIUS-Server Communication 10-26 Ip-address auth-port port-number key 10-27 Configuring the Host Mode Dot1x host-mode multi-hostMulti-domain Show dot1x interface interface-id Configuring Periodic Re-Authentication Manually Re-Authenticating a Client Connected to a Port10-29 Changing the Switch-to-Client Retransmission Time Dot1x timeout tx-period secondsChanging the Quiet Period Show dot1x interface interface-id Verify your entries Setting the Switch-to-Client Frame-Retransmission Number Switchconfig-if#dot1x timeout tx-periodShow dot1xinterface interface-id Verify your entries Dot1x max-reauth-req count Setting the Re-Authentication Number Configuring Ieee 802.1x AccountingSwitchconfig-if#dot1x max-reauth-req 10-32 Configuring a Guest Vlan 10-33 Configuring a Restricted Vlan Switchport mode private-vlan hostSwitchconfig# interface gigabitethernet2/0/2 Dot1x guest-vlan vlan-id Dot1x auth-fail vlan vlan-id Dot1x auth-fail max-attempts maxAttempts 10-35 Configuring the Inaccessible Authentication Bypass Feature Switchconfig-if#dot1x auth-fail max-attemptsRadius-server dead-criteria time time Tries tries 10-37 Configuring Ieee 802.1x Authentication with WoL Dot1x critical recovery actionReinitialize vlan vlan-id Show dot1x interface interface-id Configuring MAC Authentication Bypass Switchconfig-if#dot1x control-direction bothSwitchconfig-if#dot1x mac-auth-bypass Dot1x control-direction both Configuring NAC Layer 2 Ieee 802.1x Validation 10-40 Configuring Web Authentication 10-41 10-42 Disabling Ieee 802.1x Authentication on the Port No dot1x pae Disable Ieee 802.1x authentication on the portDot1x fallback fallback-profile 10-43 Displaying Ieee 802.1x Statistics and Status 10-44 Configuring Interface Characteristics Understanding Interface Types11-1 Switch Ports Port-Based VLANs11-2 Access Ports Trunk Ports11-3 Routed Ports Tunnel Ports11-4 Switch Virtual Interfaces EtherChannel Port Groups11-5 Power over Ethernet Ports Gigabit Ethernet InterfacesSupported Protocols and Standards 11-6 Powered-Device Detection and Initial Power Allocation Class11-7 Power Management Modes 11-8 Power Monitoring and Power Policing 11-9 Maximum Power Allocation Cutoff Power on a PoE Port 11-10 Connecting Interfaces 11-11 Ethernet Management Port 11-12 Connecting a Switch Stack to a PC 11-13 Tftp 11-14 Using Interface Configuration Mode MgmtinitMgmtshow Mgmtclr Procedures for Configuring Interfaces 11-16 Configuring a Range of Interfaces Interface range port-range macroMacroname Show interfaces interface-id 11-18 Configuring and Using Interface Range Macros Show running-config include defineDefine interface-range macroname Interface range macro macroname Configuring Ethernet Interfaces Switch# show running-config include defineSwitch# show run include define 11-20 Default Ethernet Interface Configuration 11-21 Configuring Interface Speed and Duplex Mode Speed and Duplex Configuration Guidelines11-22 Setting the Interface Speed and Duplex Parameters Speed 10 100 1000 auto 10Nonegotiate Duplex auto full half Configuring Ieee 802.3x Flow Control Flowcontrol receive on off desired11-24 Configuring Auto-MDIX on an Interface Local Side Auto-MDIXWith Correct Cabling 11-25 Configuring a Power Management Mode on a PoE Port Interface-id phy11-26 Budgeting Power for Devices Connected to a PoE Port Power inline auto max max-wattageShow power inline i nterface-id Neve r static max max-wattage Wattage 11-28 Configuring Power Policing 11-29 Adding a Description for an Interface 11-30 Configuring Layer 3 Interfaces Configuring Ethernet Management PortsSwitch# show interfaces gigabitethernet1/0/2 description 11-31 No switchport Interface gigabitethernet interface-id vlan vlan-idNo shutdown 11-32 Configuring the System MTU 11-33 Use the system mtu jumbo Use the system mtu routing System mtu jumbo bytesSystem mtu routing bytes 11-34 Configuring the Cisco Redundant Power System System mtu bytesReload Show system mtu Power rps switch-number name string serialnumber Power rps switch-number port rps-port-id mode activeStandby 11-36 Configuring the Power Supplies Power supply switch-numberoff onShow env power Show env rps Monitoring and Maintaining the Interfaces Monitoring Interface Status11-38 Clearing and Resetting Interfaces and Counters 11-39 Shutting Down and Restarting the Interface Interface vlan vlan-id gigabitethernet interface-idShutdown 11-40 Configuring Smartports Macros Understanding Smartports Macros12-1 Configuring Smartports Macros Default Smartports Macro ConfigurationMacro Name Description 12-2 Smartports Macro Configuration Guidelines 12-3 Creating Smartports Macros Macro name macro-nameName Sample-Macro and macro name sample-macro will result Show parser macro name macro-name Applying Smartports Macros 12-5 Applying Cisco-Default Smartports Macros Show parser macroShow parser macro macro-name 12-6 Switch# show parser macro cisco-desktop Switchconfig-if#macro apply cisco-desktop $AVID12-7 Displaying Smartports Macros Show parser macro briefShow parser macro description interface 12-8 Configuring VLANs Understanding VLANs13-1 13-2 Supported VLANs Vlan Port Membership Modes13-3 Configuring Normal-Range VLANs 13-4 Vlan ID 13-5 Normal-Range Vlan Configuration Guidelines Token Ring VLANs13-6 Vlan Configuration Mode Options Saving Vlan ConfigurationVlan Configuration in config-vlan Mode Vlan Configuration in Vlan Database Configuration Mode Default Ethernet Vlan Configuration Parameter Default RangeVLANxxxx, where 13-8 Copy running-config startup config Creating or Modifying an Ethernet VlanRemote-span 13-9 Deleting a Vlan Vlan database13-10 Assigning Static-Access Ports to a Vlan Switchport access vlan vlan-idNo vlan vlan-id Show vlan brief Configuring Extended-Range VLANs Default Vlan ConfigurationShow interfaces interface-id switchport Vlan fields of the display Extended-Range Vlan Configuration Guidelines 13-13 Vtp mode transparent Creating an Extended-Range VlanShow vlan id vlan-id 13-14 Switchconfig# vtp mode transparent Switch# copy running-config startup configCreating an Extended-Range Vlan with an Internal Vlan ID Show vlan internal usage Configuring Vlan Trunks Command Command Mode PurposeDisplaying VLANs Trunking Overview Switches in an ISL Trunking Environment 13-17 Mode Function Encapsulation TypesEncapsulation Function 13-18 Default Layer 2 Ethernet Interface Vlan Configuration Configuring an Ethernet Interface as a Trunk PortIeee 802.1Q Configuration Considerations 13-19 Interaction with Other Features Configuring a Trunk PortDot1q negotiate 13-20 Defining the Allowed VLANs on a Trunk 13-21 Switchport trunk allowed vlan add Changing the Pruning-Eligible ListAll except remove vlan-list 13-22 Configuring the Native Vlan for Untagged Traffic Switchport trunk pruning vlan addExcept none remove vlan-list Vlan ,vlan Configuring Trunk Ports for Load Sharing Load Sharing Using STP Port PrioritiesSwitchport trunk native vlan vlan-id 13-24 13-25 Load Sharing Using STP Path Cost Or switch stackConnect to the trunk ports configured on Switch a Exit Return to global configuration mode Switchport trunk encapsulation Interface gigabitethernet1/0/1Isl dot1q negotiate Spanning-tree vlan 2-4 cost Configuring Vmps Understanding Vmps13-28 Default Vmps Client Configuration Vmps Configuration GuidelinesDynamic-Access Port Vlan Membership 13-29 Configuring the Vmps Client Entering the IP Address of the Vmps13-30 Configuring Dynamic-Access Ports on Vmps Clients Switchport access vlan dynamicReconfirming Vlan Memberships Vmps reconfirm Changing the Reconfirmation Interval Changing the Retry CountVmps reconfirm minutes 13-32 Troubleshooting Dynamic-Access Port Vlan Membership Vmps Configuration ExampleSwitch# show vmps Monitoring the Vmps Dynamic Port Vlan Membership Configuration 13-34 Configuring VTP Understanding VTP14-1 VTP Domain 14-2 VTP Mode Description VTP ModesVTP Advertisements 14-3 VTP Version VTP Pruning14-4 14-5 Vlan Configuring VTP VTP and Switch Stacks14-6 Default VTP Configuration VTP Configuration OptionsVTP Configuration in Global Configuration Mode 14-7 VTP Configuration Guidelines VTP Configuration in Vlan Database Configuration ModePasswords Domain Names Configuring a VTP Server Configuration RequirementsVTP Version 14-9 Vtp password password Vtp password passwordShow vtp status Vtp server Configuring a VTP Client Vtp mode clientSwitch# vlan database 14-11 Disabling VTP VTP Transparent Mode 14-12 Enabling VTP Version Vtp version14-13 Adding a VTP Client Switch to a VTP Domain Enabling VTP PruningVtp pruning 14-14 14-15 Monitoring VTP 14-16 Configuring Voice Vlan Understanding Voice Vlan15-1 Cisco IP Phone Voice Traffic Cisco IP Phone Data Traffic15-2 Configuring Voice Vlan Default Voice Vlan ConfigurationVoice Vlan Configuration Guidelines 15-3 Configuring a Port Connected to a Cisco 7960 IP Phone 15-4 Configuring Cisco IP Phone Voice Traffic 15-5 Configuring the Priority of Incoming Data Frames 15-6 Displaying Voice Vlan 15-7 15-8 Configuring Private VLANs Understanding Private VLANs16-1 16-2 Private-VLAN Domain IP Addressing Scheme with Private VLANs 16-3 Private VLANs across Multiple Switches Private-VLAN Interaction with Other Features16-4 Private VLANs and Unicast, Broadcast, and Multicast Traffic Private VLANs and SVIs16-5 Configuring Private VLANs Tasks for Configuring Private VLANsPrivate VLANs and Switch Stacks 16-6 Default Private-VLAN Configuration Private-VLAN Configuration GuidelinesSecondary and Primary Vlan Configuration 16-7 Private-VLAN Port Configuration 16-8 Limitations with Other Features 16-9 Configuring and Associating VLANs in a Private Vlan 16-10 Show vlan private-vlan type Show interfaces status16-11 Configuring a Layer 2 Interface as a Private-VLAN Host Port Switchport private-vlan host-associationSwitch# show interfaces gigabitethernet1/0/22 switchport Primaryvlanid secondaryvlanid Switchport mode private-vlan promiscuous Switchport private-vlan mapping primaryvlanidAdd remove secondaryvlanlist 16-13 Switch# show interfaces private-vlan mapping Interface vlan primaryvlanidPrivate-vlan mapping add remove Show interface private-vlan mapping Monitoring Private VLANs 16-15 16-16 Configuring Ieee 802.1Q and Layer 2 Protocol Tunneling Understanding Ieee 802.1Q Tunneling17-1 Ieee 802.1Q Tunnel Ports in a Service-Provider Network 17-2 17-3 Configuring Ieee 802.1Q Tunneling Default Ieee 802.1Q Tunneling ConfigurationIeee 802.1Q Tunneling Configuration Guidelines Native VLANs System MTU 17-5 Ieee 802.1Q Tunneling and Other Features 17-6 Configuring an Ieee 802.1Q Tunneling Port Vlan dot1q tag nativeShow dot1q-tunnel Show vlan dot1q tag native Understanding Layer 2 Protocol Tunneling 17-8 17-9 Layer 2 Protocol Tunneling Configuring Layer 2 Protocol Tunneling 17-10 Default Layer 2 Protocol Tunneling Configuration 17-11 Layer 2 Protocol Tunneling Configuration Guidelines 17-12 Configuring Layer 2 Protocol Tunneling 17-13 Configuring Layer 2 Tunneling for EtherChannels Configuring the SP Edge SwitchL2protocol-tunnel point-to-point Pagp lacp udld 17-15 Configuring the Customer Switch 17-16 Switchconfig-if#channel-group 1 mode desirable Switchconfig# interface port-channel17-17 Monitoring and Maintaining Tunneling Status 17-18 Configuring STP Understanding Spanning-Tree Features18-1 STP Overview 18-2 Spanning-Tree Topology and BPDUs 18-3 Bridge ID, Switch Priority, and Extended System ID 18-4 Switch Priority Value Spanning-Tree Interface StatesBit 32768 16384 8192 4096 2048 1024 512 256 128 2illustrates how an interface moves through the states 18-6 Blocking State Listening StateLearning State Forwarding State How a Switch or Port Becomes the Root Switch or Root Port Disabled State18-8 Spanning Tree and Redundant Connectivity Spanning-Tree Address ManagementAccelerated Aging to Retain Connectivity 18-9 Spanning-Tree Modes and Protocols Supported Spanning-Tree Instances18-10 Spanning-Tree Interoperability and Backward Compatibility STP and Ieee 802.1Q TrunksVLAN-Bridge Spanning Tree Rapid PVST+ Configuring Spanning-Tree Features Spanning Tree and Switch Stacks18-12 Default Spanning-Tree Configuration Spanning-Tree Configuration Guidelines18-13 18-14 Changing the Spanning-Tree Mode 18-15 Configuring the Root Switch Disabling Spanning TreeShow spanning-tree vlan vlan-id Verify your entries 18-16 Spanning-tree vlan vlan-id root primary Diameter net-diameter hello-time secondsShow spanning-tree detail 18-17 Configuring a Secondary Root Switch Configuring Port PrioritySpanning-tree vlan vlan-id root secondary Diameter net-diameter hello-time Spanning-tree port-priority priority Spanning-tree vlan vlan-id port-priority priorityShow spanning-tree interface interface-id Show spanning-tree vlan vlan-id Configuring Path Cost Port-channel-numberSpanning-tree cost cost Spanning-tree vlan vlan-id cost cost Configuring the Switch Priority of a Vlan Spanning-tree vlan vlan-id priority priority18-21 Configuring Spanning-Tree Timers Configuring the Hello TimeSpanning-tree vlan vlan-id hello-time seconds 18-22 Configuring the Forwarding-Delay Time for a Vlan Configuring the Maximum-Aging Time for a VlanSpanning-tree vlan vlan-id forward-time Spanning-tree vlan vlan-idmax-age seconds Configuring the Transmit Hold-Count Displaying the Spanning-Tree StatusShow spanning-tree detail Verify your entries 18-24 Configuring Mstp 19-1 Understanding Mstp Multiple Spanning-Tree Regions19-2 IST, CIST, and CST Operations Within an MST Region19-3 Operations Between MST Regions 19-4 Hop Count Ieee 802.1s TerminologyCisco Prestandard Cisco Standard 19-5 Boundary Ports Ieee 802.1s Implementation19-6 Interoperation Between Legacy and Standard Switches Port Role Naming Change19-7 Mstp and Switch Stacks Detecting Unidirectional Link Failure19-8 Understanding Rstp Interoperability with Ieee 802.1D STPPort Roles and the Active Topology 19-9 Rapid Convergence 19-10 Synchronization of Port Roles 19-11 Bridge Protocol Data Unit Format and Processing Bit Function19-12 Topology Changes Processing Superior Bpdu InformationProcessing Inferior Bpdu Information 19-13 Configuring Mstp Features 19-14 Default Mstp Configuration Mstp Configuration Guidelines19-15 Specifying the MST Region Configuration and Enabling Mstp Spanning-tree mst configurationInstance instance-id vlan vlan-range Name name Spanning-tree mode mst Revision versionShow pending Exit Spanning-tree mst instance-id root primary 19-18 19-19 Spanning-tree mst instance-id port-priority priority Show spanning-tree mst interface interface-id19-20 Spanning-tree mst instance-id cost cost 19-21 Configuring the Switch Priority Configuring the Hello TimeSpanning-tree mst instance-id priority priority 19-22 Configuring the Forwarding-Delay Time Show spanning-tree mst Verify your entriesSpanning-tree mst forward-time seconds Show spanning-tree mst Configuring the Maximum-Aging Time Configuring the Maximum-Hop CountSpecifying the Link Type to Ensure Rapid Transitions Spanning-tree mst max-age seconds Designating the Neighbor Type 19-25 Displaying the MST Configuration and Status Restarting the Protocol Migration Process19-26 Configuring Optional Spanning-Tree Features Understanding Optional Spanning-Tree Features20-1 Understanding Port Fast Understanding Bpdu Guard20-2 Understanding Bpdu Filtering Understanding UplinkFast20-3 Switches in a Hierarchical Network 20-4 Understanding Cross-Stack UplinkFast 20-5 How Csuf Works 20-6 Understanding BackboneFast Events that Cause Fast Convergence20-7 20-8 BackboneFast Example Before Indirect Link Failure Adding a Switch in a Shared-Medium Topology 20-9 Understanding EtherChannel Guard Understanding Root Guard20-10 Understanding Loop Guard 20-11 Default Optional Spanning-Tree Configuration Optional Spanning-Tree Configuration GuidelinesEnabling Port Fast 20-12 Spanning-tree portfast trunk interface configuration Enabling Bpdu GuardSpanning-tree portfast trunk Portfast Spanning-tree portfast Enable the Port Fast feature Enabling Bpdu Filtering20-14 Enabling UplinkFast for Use with Redundant Links 20-15 Spanning-tree uplinkfast max-update-rate Uplinkfast commandEnabling Cross-Stack UplinkFast Enabling BackboneFast Spanning-tree backbonefast Enable BackboneFast Enabling EtherChannel GuardShow spanning-tree summary Verify your entries 20-17 Enabling Root Guard Enabling Loop Guard20-18 20-19 20-20 Flex Links 21-1 Switchport backup interface preemption delay commands Vlan Flex Link Load Balancing and Support21-2 MAC Address-Table Move Update 21-3 MAC Address-Table Move Update Example 21-4 Configuration Guidelines Default Configuration21-5 Configuring Flex Links Switchport backup interface interface-idShow interface interface-id switchport backup Switch# show interface switchport backup Switchport backup interface interface-id preemption Mode forced bandwidth offDelay delay-time 21-7 Configuring Vlan Load Balancing on Flex Links Switchport backup interface interface-id prefer vlanShow interfaces interface-id switchport backup Switch#show interfaces switchport backup Configuring the MAC Address-Table Move Update Feature Switchport backup interface interface-idmmuPrimary vlan vlan-id 21-9 End Return to global configuration mode Switchconf# mac address-table move update transmitSwitch# show mac-address-table move update 21-10 Monitoring Flex Links and the MAC Address-Table Move Update 21-11 21-12 Configuring Dhcp Features and IP Source Guard Understanding Dhcp Features22-1 Dhcp Server Dhcp Relay AgentDhcp Snooping 22-2 Option-82 Data Insertion 22-3 22-4 Dhcp Relay Agent in a Metropolitan Ethernet Network Remote ID Suboption Frame Format 22-5 Cisco IOS Dhcp Server Database Dhcp Snooping Binding DatabaseRelease 22-6 22-7 Configuring Dhcp Features Dhcp Snooping and Switch StacksDefault Dhcp Configuration 22-8 Dhcp Snooping Configuration Guidelines 22-9 Configuring the Dhcp Server Dhcp Server and Switch Stacks22-10 Configuring the Dhcp Relay Agent Specifying the Packet Forwarding AddressIp helper-address address 22-11 Switchport mode access Switchport access vlan vlan-idEnabling Dhcp Snooping and Option Interface range port-range 22-13 Enabling Dhcp Snooping on Private VLANs Enabling the Cisco IOS Dhcp Server DatabaseEnabling the Dhcp Snooping Binding Database Agent Ip dhcp snooping database Displaying Dhcp Snooping Information 22-15 Understanding IP Source Guard Source IP Address Filtering22-16 Configuring IP Source Guard Default IP Source Guard ConfigurationIP Source Guard Configuration Guidelines Source IP and MAC Address Filtering Enabling IP Source Guard 22-18 Displaying IP Source Guard Information 22-19 22-20 Configuring Dynamic ARP Inspection Understanding Dynamic ARP Inspection23-1 23-2 ARP Cache Poisoning Interface Trust States and Network Security 23-3 Rate Limiting of ARP Packets Relative Priority of ARP ACLs and Dhcp Snooping Entries23-4 Configuring Dynamic ARP Inspection Default Dynamic ARP Inspection ConfigurationLogging of Dropped Packets 23-5 Dynamic ARP Inspection Configuration Guidelines 23-6 Configuring Dynamic ARP Inspection in Dhcp Environments Show cdp neighborsIp arp inspection vlan vlan-range 23-7 Configuring ARP ACLs for Non-DHCP Environments 23-8 23-9 Show arp access-list acl-name Limiting the Rate of Incoming ARP PacketsNo ip arp inspection trust Specified with the ip arp inspection vlan logging Performing Validation Checks 23-11 Configuring the Log Buffer Ip arp inspection validateSrc-mac dst-mac ip Show ip arp inspection vlan Ip arp inspection log-buffer entries Number logs number interval23-13 Displaying Dynamic ARP Inspection Information 23-14 Clear ip arp inspection statistics Show ip arp inspection statistics vlanClear ip arp inspection log Show ip arp inspection log 23-16 Configuring Igmp Snooping and MVR 24-1 Understanding Igmp Snooping 24-2 Igmp Versions Joining a Multicast Group24-3 224.1.2.3 24-4 Leaving a Multicast Group 24-5 Igmp Configurable-Leave Timer Immediate LeaveIgmp Report Suppression 24-6 Configuring Igmp Snooping Igmp Snooping and Switch StacksDefault Igmp Snooping Configuration PIM-DVMRP Enabling or Disabling Igmp Snooping Ip igmp snooping vlan vlan-id24-8 Setting the Snooping Method Ip igmp snooping vlan vlan-id mrouterLearn cgmp pim-dvmrp Show ip igmp snooping Configuring a Multicast Router Port Show ip igmp snooping mrouter vlan vlan-id24-10 Configuring a Host Statically to Join a Group Enabling Igmp Immediate LeaveIp igmp snooping vlan vlan-id static ipaddress Show ip igmp snooping groups Configuring the Igmp Leave Timer 24-12 Configuring TCN-Related Commands Recovering from Flood ModeControlling the Multicast Flooding Time After a TCN Event Count Disabling Multicast Flooding During a TCN Event No ip igmp snooping tcn flood24-14 Configuring the Igmp Snooping Querier 24-15 Disabling Igmp Report Suppression No ip igmp snooping report-suppression24-16 Displaying Igmp Snooping Information 24-17 Understanding Multicast Vlan Registration 24-18 Using MVR in a Multicast Television Application 24-19 Configuring MVR Default MVR ConfigurationMVR 24-20 MVR Configuration Guidelines and Limitations Configuring MVR Global ParametersMvr Enable MVR on the switch 24-21 Configuring MVR Interfaces 24-22 Mvr type source receiver Mvr immediateShow mvr Show mvr interface Show mvr members Configuring Igmp Filtering and Throttling Displaying MVR Information24-24 Default Igmp Filtering and Throttling Configuration Configuring Igmp Profiles24-25 Ip igmp profile profile number Permit denyRange ip multicast address Show ip igmp profile profile number Setting the Maximum Number of Igmp Groups Switch# show ip igmp profileApplying Igmp Profiles Ip igmp filter profile number Configuring the Igmp Throttling Action Show running-config interface Verify the configurationEtherChannel group or a EtherChannel interface Interface-id Displaying Igmp Filtering and Throttling Configuration Ip igmp max-groups action denyReplace Show ip igmp profile profile 24-30 Configuring IPv6 MLD Snooping Understanding MLD Snooping25-1 25-2 MLD Messages MLD QueriesMulticast Client Aging Robustness 25-3 Multicast Router Discovery MLD ReportsMLD Done Messages and Immediate-Leave 25-4 Configuring IPv6 MLD Snooping MLD Snooping in Switch StacksTopology Change Notification Processing 25-5 Default MLD Snooping Configuration MLD Snooping Configuration Guidelines25-6 Enabling or Disabling MLD Snooping Ipv6 mld snoopingIpv6 mld snooping vlan vlan-id 25-7 Configuring a Static Multicast Group Ipv6 mld snooping vlan vlan-id staticShow ipv6 mld snooping multicast-address user Show ipv6 mld snooping multicast-address vlan Enabling MLD Immediate Leave Ipv6 mld snooping vlan vlan-id mrouterShow ipv6 mld snooping mrouter vlan vlan-id 25-9 Configuring MLD Snooping Queries 25-10 Displaying MLD Snooping Information Disabling MLD Listener Message Suppression25-11 Show ipv6 mld snooping querier vlan vlan-id Vlan-id count dynamic userVlan-id ipv6-multicast-address 25-12 Configuring Port-Based Traffic Control Configuring Storm ControlUnderstanding Storm Control 26-1 26-2 Broadcast Storm Control Example Default Storm Control Configuration Configuring Storm Control and Threshold Levels26-3 Storm-control broadcast multicast Unicast level level level-low bps bpsBps-low pps pps pps-low Storm-control action shutdown trap Configuring Protected Ports Default Protected Port ConfigurationShow storm-control interface-id broadcast Multicast unicast Configuring Port Blocking Protected Port Configuration GuidelinesConfiguring a Protected Port 26-6 Configuring Port Security Default Port Blocking ConfigurationBlocking Flooded Traffic on an Interface 26-7 Understanding Port Security Secure MAC Addresses26-8 Security Violations 26-9 Default Port Security Configuration Port Security Configuration GuidelinesForwarded1 Trap Message Message2 Increments 26-10 26-11 Enabling and Configuring Port Security 26-12 Switchport port-security violation Protect restrict shutdownShutdown vlan 26-13 26-14 Switchconfig-if#switchport port-security Switchconfig-if#switchport port-security maximumSwitchconfig-if#switchport port-security mac-address sticky Switchconfig-if#switchport port-security violation restrict Enabling and Configuring Port Security Aging 26-16 Port Security and Switch Stacks Switchconfig# interface GigabitEthernet 1/0/8Port Security and Private VLANs 26-17 Displaying Port-Based Traffic Control Settings Show port-security interface interface-idaddressShow port-security interface interface-idvlan 26-18 Configuring CDP Understanding CDP27-1 Configuring CDP CDP and Switch StacksDefault CDP Configuration Configuring the CDP Characteristics Disabling and Enabling CDP Cdp holdtime secondsCdp advertise-v2 Show cdp No cdp enable Disable CDP on the interface Cdp enable Enable CDP on the interface after disabling itDisabling and Enabling CDP on an Interface 27-4 Monitoring and Maintaining CDP 27-5 27-6 Configuring Lldp and LLDP-MED Understanding Lldp and LLDP-MEDUnderstanding Lldp 28-1 Understanding LLDP-MED 28-2 Configuring Lldp and LLDP-MED Default Lldp ConfigurationConfiguring Lldp Characteristics 28-3 Disabling and Enabling Lldp Globally 28-4 Disabling and Enabling Lldp on an Interface 28-5 Configuring LLDP-MED TLVs TLV, and enter interface configuration modeNo lldp med-tlv-select tlv Specify the TLV to disable Lldp med-tlv-select tlv Specify the TLV to enable Monitoring and Maintaining Lldp and LLDP-MED 28-7 28-8 Configuring Udld Understanding UdldModes of Operation 29-1 Methods to Detect Unidirectional Links 29-2 Configuring Udld 29-3 Default Udld Configuration 29-4 Udld aggressive enable message time Message-timer-intervalEnabling Udld Globally Show udld Resetting an Interface Disabled by Udld Udld reset Show udldEnabling Udld on an Interface Udld port aggressive Displaying Udld Status 29-7 29-8 Configuring Span and Rspan Understanding Span and Rspan30-1 Local Span 30-2 Remote Span 30-3 Span and Rspan Concepts and Terminology Span Sessions30-4 Monitored Traffic 30-5 Source Ports 30-6 Source VLANs Vlan Filtering30-7 Destination Port 30-8 Span and Rspan Interaction with Other Features Rspan Vlan30-9 Configuring Span and Rspan Span and Rspan and Switch Stacks30-10 Default Span and Rspan Configuration Configuring Local SpanSpan Configuration Guidelines 30-11 Creating a Local Span Session 30-12 Monitor session sessionnumber Destination interface interface-idEncapsulation replicate Show monitor session sessionnumber 30-14 Specifying VLANs to Filter Monitor session sessionnumber filter vlan30-15 Configuring Rspan Rspan Configuration GuidelinesBe a Vlan 30-16 Configuring a Vlan as an Rspan Vlan 30-17 Creating an Rspan Source Session Interfaces port-channelport-channel-number. ValidDestination remote vlan vlan-id 30-18 Creating an Rspan Destination Session Remote vlan vlan-id30-19 30-20 Ingress dot1q vlan vlan-id isl untagged Untagged vlan vlan-id or vlan vlan-id- Forward incoming30-21 Show monitor session sessionnumber 30-22 Displaying Span and Rspan Status 30-23 30-24 Configuring Rmon Understanding Rmon31-1 Configuring Rmon 31-2 Default Rmon Configuration Configuring Rmon Alarms and Events31-3 Rmon event number description string log owner string Add an event in the Rmon event table that is31-4 Collecting Group History Statistics on an Interface Collecting Group Ethernet Statistics on an InterfaceRmon collection history index Show rmon history Displaying Rmon Status Rmon collection stats index owner ownernameShow rmon statistics 31-6 Configuring System Message Logging Understanding System Message Logging32-1 Configuring System Message Logging System Log Message Format32-2 Hhmmss short uptime Text string that uniquely describes the message32-3 Default System Message Logging Configuration No logging console Disable message loggingShow running-config Verify your entries Show logging Disabling Message Logging Setting the Message Display Destination Device Logging buffered sizeLogging host 32-5 Synchronizing Log Messages Logging file flash filenameTerminal monitor Session to see the debugging messages Line console vty line-number Line vtyLogging synchronous level severity-level All limit number-of-buffers Enabling and Disabling Time Stamps on Log Messages Enabling and Disabling Sequence Numbers in Log Messages32-8 Defining the Message Severity Level Logging console levelLogging monitor level Logging trap level Level Description Syslog Definition 32-10 Enabling the Configuration-Change Logger Logging history levelLogging history size number 32-11 Configuring Unix Syslog Servers Logging Messages to a Unix Syslog Daemon32-12 Configuring the Unix System Logging Facility Logging facility facility-typeFacility-type keywords 32-13 Displaying the Logging Configuration Facility Type Keyword Description32-14 Configuring Snmp Understanding Snmp33-1 Snmp Versions 33-2 Model Level Authentication Encryption Result Snmp Manager FunctionsDES Operation Description Using Snmp to Access MIB Variables Snmp Agent Functions33-4 Snmp Notifications 33-5 Configuring Snmp Snmp ifIndex MIB Object ValuesIfIndex Range SVI Default Snmp Configuration Snmp Configuration Guidelines33-7 Configuring Community Strings No snmp-server Disable the Snmp agent operationDisabling the Snmp Agent 33-8 View-name ro rw access-list-number Access-list access-list-number denySnmp-server community string view Permit source source-wildcard Configuring Snmp Groups and Users Snmp-server engineID local engineid-stringSnmp-server engineID local 33-10 Write writeview notify notifyview access Snmp-server group groupname v1 v2cAuth noauth priv read readview 33-11 Configuring Snmp Notifications Remote host udp-port port v1 accessEncrypted access access-list auth md5 Notification Type Keyword Description 33-13 33-14 Setting the Agent Contact and Location Information 33-12 , or enter snmp-server enable traps ?Enable traps command for each trap type Notification-types Switchconfig# snmp-server community public Limiting Tftp Servers Used Through SnmpSnmp Examples Snmp-server tftp-server-list Displaying Snmp Status 33-17 33-18 Configuring Network Security with ACLs Understanding ACLs34-1 Supported ACLs 34-2 Port ACLs 34-3 Router ACLs 34-4 Handling Fragmented and Unfragmented Traffic Vlan Maps34-5 ACLs and Switch Stacks 34-6 Configuring IPv4 ACLs 34-7 Access List Numbers Access List Number Type SupportedCreating Standard and Extended IPv4 ACLs 34-8 ACL Logging 34-9 Access-list access-list-number deny permit Show access-lists number nameCreating a Numbered Standard ACL Source source-wildcard log Creating a Numbered Extended ACL 34-11 34-12 34-13 34-14 Resequencing ACEs in an ACL Creating Named Standard and Extended ACLs34-15 Ip access-list standard name Ip access-list extended nameAny log Tos tos established log time-range Using Time Ranges with ACLs 34-17 Absolute start time date Periodic weekdays weekend dailyShow time-range 34-18 Switch# show ip access-lists Applying an IPv4 ACL to a Terminal LineIncluding Comments in ACLs 34-19 Access-class access-list-number Applying an IPv4 ACL to an InterfaceOut 34-20 Ip access-group access-list-number 34-21 IPv4 ACL Configuration Examples Hardware and Software Treatment of IP ACLs34-22 Switchconfig# access-list 6 permit 172.20.128.64 Switchconfig# access-list 106 permit ip any 172.20.128.6434-23 Numbered ACLs Extended ACLs34-24 Named ACLs Time Range Applied to an IP ACLCommented IP ACL Entries 34-25 Switch# show logging Switchconfig-if#ip access-group ext134-26 Creating Named MAC Extended ACLs 34-27 Applying a MAC ACL to a Layer 2 Interface 34-28 Configuring Vlan Maps Mac access-group nameShow mac access-group interface interface-id ACL Vlan Map Configuration Guidelines 34-30 Vlan access-map name number Creating a Vlan MapAction drop forward Match ip mac address name Examples of ACLs and Vlan Maps 34-32 34-33 Using Vlan Maps in Your Network Wiring Closet ConfigurationApplying a Vlan Map to a Vlan Vlan filter mapname vlan-list list Denying Access to a Server on Anothera Vlan Switchconfig# vlan access-map map2Switchconfig# ip access-list extended matchall Switchconfig# vlan filter map2 vlan Using Vlan Maps with Router ACLs 34-36 Vlan Maps and Router ACL Configuration Guidelines 34-37 ACLs and Switched Packets Examples of Router ACLs and Vlan Maps Applied to VLANsACLs and Bridged Packets 34-38 ACLs and Routed Packets 34-39 Displaying IPv4 ACL Configuration Show ip access-lists number nameACLs and Multicast Packets 34-40 Show running-config interface interface-id Show mac access-group interface interface-idShow ip interface interface-id 34-41 34-42 Configuring IPv6 ACLs 35-1 Understanding IPv6 ACLs 35-2 Supported ACL Features IPv6 ACLs and Switch StacksIPv6 ACL Limitations 35-3 Configuring IPv6 ACLs Default IPv6 ACL ConfigurationInteraction with Other Features and Switches 35-4 Ipv6 access-list access-list-name Creating IPv6 ACLs35-5 Dscp value fragments log Log-input routing sequenceValue time-range name 35-6 35-7 Ipv6 traffic-filter access-list-name Applying an IPv6 ACL to an InterfaceIpv6 address ipv6-address 35-8 Show access-lists Show ipv6 access-list access-list-nameDisplaying IPv6 ACLs 35-9 35-10 Configuring QoS 36-1 Understanding QoS 36-2 Basic QoS Model 36-3 36-4 Basic QoS Model Classification 36-5 36-6 Check if packet came with CoS label tag Yes Classification Based on QoS ACLs Classification Based on Class Maps and Policy Maps36-7 Policing and Marking 36-8 Policing on Physical Ports 36-9 Policing on SVIs 36-10 Policing and Marking Flowchart on SVIs 36-11 Mapping Tables 36-12 Queueing and Scheduling Overview 36-13 Weighted Tail Drop SRR Shaping and Sharing36-14 Queueing and Scheduling on Ingress Queues 36-15 Queue Type Function 36-16 WTD Thresholds 36-17 Queueing and Scheduling on Egress Queues 36-18 36-19 Buffer and Memory Allocation 36-20 Packet Modification 36-21 Configuring Auto-QoS 36-22 Generated Auto-QoS Configuration 36-23 Description Automatically Generated Command 36-24 36-25 Switch automatically configures the egress queue buffer Sizes. It configures the bandwidth and the SRR mode shapedIf you entered the auto qos voip trust command, the switch Or shared on the egress queues mapped to the port Effects of Auto-QoS on the Configuration Auto-QoS Configuration Guidelines36-27 Enabling Auto-QoS for VoIP Auto qos voip cisco-phoneCisco-softphone trust Show auto qos interface interface-id 36-29 Auto-QoS Configuration Example 36-30 Cdp enable Debug auto qosAuto qos voip trust Show auto qos Configuring Standard QoS Displaying Auto-QoS Information36-32 Default Standard QoS Configuration Default Ingress Queue Configuration36-33 Default Egress Queue Configuration Dscp Value Queue ID -Threshold ID36-34 Standard QoS Configuration Guidelines Default Mapping Table ConfigurationQoS ACL Guidelines Applying QoS on Interfaces Policing Guidelines General QoS Guidelines36-36 Enabling QoS Globally Enabling VLAN-Based QoS on Physical Ports36-37 Configuring Classification Using Port Trust States Configuring the Trust State on Ports within the QoS Domain36-38 36-39 15 Port Trusted States within the QoS Domain Configuring the CoS Value for an Interface Mls qos trust cos dscp ip-precedenceShow mls qos interface 36-40 Configuring a Trusted Boundary to Ensure Port Security Mls qos cos default-cos override36-41 Enabling Dscp Transparency Mode Mls qos trust dscpMls qos trust device cisco-phone 36-42 No mls qos rewrite ip dscp 36-43 Mls qos map dscp-mutation Mls qos dscp-mutationShow mls qos maps dscp-mutation 36-44 Configuring a QoS Policy Switchconfig-if#mls qos dscp-mutation gi1/0/2-mutation36-45 Classifying Traffic by Using ACLs 36-46 Switchconfig# access-list 100 permit ip any any dscp Switchconfig# access-list 102 permit pim any 224.0.0.2 dscpPermit protocol source source-wildcard Source-wildcard Mac access-list extended name 36-48 Classifying Traffic by Using Class Maps Class-map match-all match-anyIs match-all Match-any keywords Match access-group acl-index-or-name Ip dscp dscp-list ip precedenceIp-precedence-list Show class-map 36-51 Policy-map policy-map-name Class class-map-name36-52 36-53 Service-policy input policy-map-name Show policy-map policy-map-nameclass36-54 Switchconfig# policy-map macpolicy1 Switchconfig-pmap#class macclass2 maclist2Switchconfig-if#service-policy input macpolicy1 36-55 Traffic by Using Class Maps section on 36-56 36-57 Police rate-bps burst-byte exceed-action Drop policed-dscp-transmitExceed-action policed-dscp-transmit keywords to mark down 36-58 Service-policy policy-map-name 36-59 Service-policy input policy-map-name Show policy-map policy-map-nameclassShow mls qos vlan-based Mls qos aggregate-policer Aggregate-policer-name rate-bps burst-byteExceed-action drop Policed-dscp-transmit Only one policy map per ingress port is supported Show mls qos aggregate-policerAggregate-policer-name Configuring Dscp Maps Configuring the CoS-to-DSCP MapSwitchconfig-pmap-c#police aggregate transmit1 CoS Value Dscp Value Configuring the IP-Precedence-to-DSCP Map Mls qos map cos-dscp dscp1...dscp8IP Precedence Value Dscp Value 36-64 Configuring the Policed-DSCP Map 36-65 Configuring the DSCP-to-CoS Map Dscp Value CoS Value36-66 Show Configuring the DSCP-to-DSCP-Mutation Map Mls qos map dscp-cos dscp-list to cosShow mls qos maps dscp-to-cos 36-67 Switchconfig-if#mls qos dscp-mutation mutation1 Switch# show mls qos maps dscp-mutation mutation136-68 Configuring Ingress Queue Characteristics 36-69 Mls qos srr-queue input dscp-map Mls qos srr-queue input cos-mapMls qos srr-queue input threshold Show mls qos maps Allocating Buffer Space Between the Ingress Queues Allocating Bandwidth Between the Ingress QueuesMls qos srr-queue input buffers Show mls qos interface buffer Configuring the Ingress Priority Queue Weight1 weight2Mls qos srr-queue input bandwidth Show mls qos interface queueing Configuring Egress Queue Characteristics WeightMls qos srr-queue input Priority-queue queue-id bandwidth 36-74 Mls qos queue-set output qset-id Queue-set qset-id36-75 36-76 Mls qos srr-queue output dscp-map Mls qos srr-queue output cos-map36-77 Configuring SRR Shaped Weights on Egress Queues Srr-queue bandwidth shape weight1Weight2 weight3 weight4 Queueing Configuring SRR Shared Weights on Egress Queues Configuring the Egress Expedite QueueSrr-queue bandwidth share weight1 36-79 Mls qos Enable QoS on a switch Srr-queue bandwidth limit weight1Limiting the Bandwidth on an Egress Interface 36-80 Displaying Standard QoS Information 36-81 Show running-config include rewrite 36-82 Configuring EtherChannels and Link-State Tracking Understanding EtherChannels37-1 EtherChannel Overview 37-2 Single-Switch EtherChannel 37-3 Port-Channel Interfaces 37-4 Port Aggregation Protocol 37-5 PAgP Interaction with Other Features Mode DescriptionPAgP Modes Auto Lacp Interaction with Other Features Link Aggregation Control ProtocolLacp Modes 37-7 EtherChannel On Mode Load-Balancing and Forwarding Methods37-8 37-9 EtherChannel and Switch Stacks 37-10 Configuring EtherChannels Default EtherChannel Configuration37-11 EtherChannel Configuration Guidelines 37-12 Configuring Layer 2 EtherChannels 37-13 Auto non-silent desirable non-silent on Active passive37-14 Configuring Layer 3 EtherChannels Switchconfig-if-range#channel-group 5 mode activeCreating Port-Channel Logical Interfaces 37-15 Configuring the Physical Interfaces Interface port-channel port-channel-numberShow etherchannel channel-group-number detail No ip address Partner that is PAgP capable, configure the switch port for For channel-group-number, the range is 1 to 48. This numberMust be the same as the port-channel-number logical port 37-17 Configuring EtherChannel Load-Balancing Port-channel load-balance dst-ip dst-macSrc-dst-ip src-dst-mac src-ip src-mac 37-18 Configuring the PAgP Learn Method and Priority Show etherchannel load-balance Verify your entries37-19 Configuring Lacp Hot-Standby Ports Pagp learn-method physical-portPagp port-priority priority Show pagp channel-group-number internal Configuring the Lacp System Priority Show running-config Verify your entries Show lacp sys-id37-21 Configuring the Lacp Port Priority Lacp port-priority priorityShow lacp channel-group-number Internal Displaying EtherChannel, PAgP, and Lacp Status Understanding Link-State Tracking37-23 37-24 Configuring Link-State Tracking 37-25 Default Link-State Tracking Configuration Link-State Tracking Configuration GuidelinesConfiguring Link-State Tracking 37-26 Switch show link state group Switch show link state group detailDisplaying Link-State Tracking Status 37-27 37-28 Configuring IP Unicast Routing 38-1 Understanding IP Routing Types of Routing38-2 IP Routing and Switch Stacks 38-3 38-4 Steps for Configuring Routing Configuring IP Addressing38-5 Default Addressing Configuration ARPIrdp 38-6 Show running-config Verify your entry Assigning IP Addresses to Network InterfacesUse of Subnet Zero 38-7 Classless Routing 38-8 Configuring Address Resolution Methods No ip classless Disable classless routing behavior38-9 Define a Static ARP Cache Arp ip-address hardware-address type38-10 Set ARP Encapsulation 38-11 Routing Assistance When IP Routing is Disabled Enable Proxy ARPDefault Gateway Proxy ARP Icmp Router Discovery Protocol Irdp 38-13 Configuring Broadcast Packet Handling 38-14 Ip directed-broadcast access-list-number Ip forward-protocol udp port nd sdns38-15 Forwarding UDP Broadcast Packets and Protocols 38-16 Establishing an IP Broadcast Address Flooding IP BroadcastsIp broadcast-address ip-address 38-17 Monitoring and Maintaining IP Addressing Clear arp-cacheClear host name Clear ip route network mask Enabling IP Unicast Routing 38-19 Configuring RIP 38-20 Default RIP Configuration Configuring Basic RIP ParametersRouter rip Network network number 38-22 Configuring RIP Authentication Configuring Summary Addresses and Split HorizonIp rip authentication key-chain name-of-chain Ip rip authentication mode text md5 Configuring Split Horizon Switchconfig-router#neighbor 2.2.2.2 peer-group mygroupIp summary-address rip ip address ip-network mask No ip split horizon Configuring Ospf No ip split-horizon38-25 Default Ospf Configuration 38-26 Ospf Nonstop Forwarding 38-27 Ospf NSF Awareness 38-28 Configuring Basic Ospf Parameters Configuring Ospf Interfaces38-29 38-30 Configuring Ospf Area Parameters 38-31 Configuring Other Ospf Parameters 38-32 38-33 Configuring a Loopback Interface Changing LSA Group PacingIp address address mask 38-34 Configuring Eigrp Monitoring Ospf38-35 38-36 Default Eigrp Configuration 38-37 Eigrp Nonstop Forwarding 38-38 Configuring Basic Eigrp Parameters Router eigrp autonomous-systemNetwork network-number Eigrp log-neighbor-changes Configuring Eigrp Interfaces No auto-summaryIp summary-address eigrp 38-40 Configuring Eigrp Route Authentication Ip hello-interval eigrp autonomous-system-numberNo ip split-horizon eigrp autonomous-system-number Show ip eigrp interface Eigrp Stub Routing 38-42 Configuring BGP Monitoring and Maintaining Eigrp38-43 38-44 EBGP, IBGP, and Multiple Autonomous Systems Default BGP Configuration 38-45 38-46 Nonstop Forwarding Awareness 38-47 Enabling BGP Routing Router bgp autonomous-systemNetwork network-number mask network-mask Route-map route-map-name 38-49 Switchconfig-router#neighbor 192.208.10.2 remote-as Switch# show ip bgp neighborsManaging Routing Policy Changes 38-50 Type of Reset Advantages Disadvantages Show ip bgp neighborsClear ip bgp * address Show ip bgp Configuring BGP Decision Attributes 38-52 38-53 Configuring BGP Filtering with Route Maps Configuring BGP Filtering by Neighbor38-54 Ip as-path access-list access-list-number Out weight weightRoute-map map-tag in out Show ip bgp neighbors paths Configuring Prefix Lists for BGP Filtering 38-56 Configuring BGP Community Filtering Ip community-listcommunity-list-numberPermit deny community-number Send-community Configuring BGP Neighbors and Peer Groups Set comm-list list-num deleteIp bgp-community new-format Show ip bgp community 38-59 Configuring Aggregate Addresses 38-60 Configuring Routing Domain Confederations Configuring BGP Route Reflectors38-61 Configuring Route Dampening Route-reflector-clientBgp cluster-id cluster-id No bgp client-to-client reflection Monitoring and Maintaining BGP 38-63 Configuring Multi-VRF CE 38-64 Understanding Multi-VRF CE 38-65 38-66 Default Multi-VRF CE Configuration Multi-VRF CE Configuration GuidelinesVRF 38-67 Configuring VRFs Route-target export import bothImport map route-map Ip vrf forwarding vrf-name Configuring a VPN Routing Session Show ip vrf brief detail interfacesLog-adjacency-changes Redistribute bgp Configuring BGP PE to CE Routing Sessions Multi-VRF CE Configuration Example38-70 38-71 VPN2 CE1 Configuring Switch a 38-72 Switchconfig-router-af#network 8.8.2.0 mask Switchconfig-router-af#network 8.8.1.0 maskSwitchconfig-if#ip address 208.0.0.20 38-73 Router# configure terminal 38-74 Configuring Unicast Reverse Path Forwarding Displaying Multi-VRF CE Status38-75 Configuring Protocol-Independent Features Configuring Distributed Cisco Express Forwarding38-76 Configuring the Number of Equal-Cost Routing Paths 38-77 Configuring Static Unicast Routes Router bgp rip ospf eigrpMaximum-paths maximum Show ip route Specifying Default Routes and Networks Route Source Default DistanceIp default-network network number Specify a default network 38-79 Using Route Maps to Redistribute Routing Information 38-80 38-81 38-82 Configuring Policy-Based Routing 38-83 PBR Configuration Guidelines 38-84 Enabling PBR 38-85 Ip policy route-map map-tag Ip route-cache policyIp local policy route-map map-tag 38-86 Setting Passive Interfaces Filtering Routing Information38-87 Controlling Advertising and Processing in Routing Updates Filtering Sources of Routing InformationRouter bgp rip eigrp 38-88 Managing Authentication Keys Distance weight ip-address ip-address maskIp access list 38-89 Monitoring and Maintaining the IP Network 38-90 38-91 38-92 Configuring IPv6 Unicast Routing Understanding IPv639-1 IPv6 Addresses 39-2 Supported IPv6 Unicast Routing Features Bit Wide Unicast Addresses39-3 DNS for IPv6 Path MTU Discovery for IPv6 UnicastICMPv6 Neighbor Discovery IPv6 Applications 39-5 Unsupported IPv6 Unicast Routing Features Dual IPv4 and IPv6 Protocol Stacks39-6 IPv6 and Switch Stacks Limitations39-7 39-8 SDM Templates Dual IPv4-and IPv6 SDM Templates39-9 Configuring IPv6 39-10 Default IPv6 Configuration Configuring IPv6 Addressing and Enabling IPv6 Routing39-11 39-12 Configuring IPv4 and IPv6 Protocol Stacks Ip routing Enable routing on the switchSwitchconfig-if#ipv6 address 20010DB8c181/64 eui 39-13 39-14 Configuring IPv6 Icmp Rate Limiting Configuring CEF and dCEF for IPv6Ipv6 icmp error-interval interval bucketsize Show ipv6 interface interface-id Configuring Static Routing for IPv6 39-16 Administrative distance Ipv6 route ipv6-prefix/prefix lengthIpv6-address interface-id ipv6-address 39-17 Configuring RIP for IPv6 Show ipv6 route static updatedShow ipv6 static ipv6-address Interface-id recursive detail 39-19 Configuring Ospf for IPv6 39-20 39-21 Switch# show ipv6 interface Displaying IPv639-22 Switch# show ipv6 cef /0 Switch# show ipv6 protocolsSwitch# show ipv6 rip 39-23 Switch# show ipv6 neighbors Switch# show ipv6 staticSwitch# show ipv6 route Switch# show ipv6 traffic 39-25 39-26 Configuring Hsrp and Enhanced Object Tracking Understanding Hsrp40-1 40-2 Multiple Hsrp 40-3 Configuring Hsrp Hsrp and Switch Stacks40-4 Default Hsrp Configuration Hsrp Configuration GuidelinesEnabling Hsrp 40-5 Switch# show standby Standby group-number ip ip-addressSecondary Show standby interface-id group Configuring Hsrp Priority 40-7 Priority preempt delay delay Standby group-number priorityStandby group-number track 40-8 Configuring Mhsrp Configuring Hsrp Authentication and TimersSwitchconfig-if#standby 2 ip 40-9 Standby group-number authentication string Standby group-number timers hellotimeSwitchconfig-if#standby 1 authentication word Holdtime Displaying Hsrp Configurations Configuring Hsrp Groups and ClusteringEnabling Hsrp Support for Icmp Redirect Messages Show standby interface-idgroup brief detail Configuring Enhanced Object Tracking Understanding Enhanced Object Tracking40-12 Configuring Enhanced Object Tracking Features Tracking Interface Line-Protocol or IP Routing StateTrack object-number interface 40-13 Configuring a Tracked List Switch# show track 33 TrackTrack track-numberlist boolean Object object-number not Weight Threshold weight up numberTrack track-numberlist threshold 40-15 Track track-number list threshold PercentageObject object-number Threshold percentage up number Configuring Hsrp Object Tracking 40-17 Configuring Other Tracking Characteristics Show standby40-18 Configuring Web Cache Services By Using Understanding Wccp41-1 Wccp Message Exchange 41-2 Packet Redirection and Service Groups Wccp NegotiationMD5 Security 41-3 Wccp and Switch Stacks 41-4 Configuring Wccp Unsupported Wccp FeaturesDefault Wccp Configuration Wccp Configuration Guidelines Enabling the Web Cache Service 41-6 41-7 41-8 Switchconfig# interface range gigabitethernet1/0/3 Switchconfig-if-range#switchport access vlanMonitoring and Maintaining Wccp 41-9 Enabled / disabled 41-10 Configuring IP Multicast Routing 42-1 42-2 IP Multicast Routing Protocols Understanding Igmp Igmp Version42-3 Understanding PIM PIM VersionsPIM Modes 42-4 PIM Stub Routing 42-5 Auto-RP 42-6 Bootstrap Router Multicast Forwarding and Reverse Path Check42-7 Understanding Dvmrp Network Port42-8 Multicast Routing and Switch Stacks Understanding Cgmp42-9 Configuring IP Multicast Routing Default Multicast Routing ConfigurationMulticast Routing Configuration Guidelines 42-10 Auto-RP and BSR Configuration Guidelines PIMv1 and PIMv2 Interoperability42-11 Configuring Basic Multicast Routing Ip multicast-routing distributed42-12 Configuring PIM Stub Routing Ip pim version 1Ip pim dense-mode sparse-mode Sparse-dense-mode Configuring a Rendezvous Point Manually Assigning an RP to Multicast GroupsIp pim passive 42-14 Access-list-number override Ip pim rp-address ip-address42-15 Configuring Auto-RP 42-16 Scope ttl group-list access-list-number Ip pim send-rp-announce interface-idInterval seconds 42-17 Ip pim send-rp-discovery scope ttl Show ip pim rp mappingShow ip pim rp 42-18 Access-list-number group-list Ip pim rp-announce-filter rp-list42-19 Configuring PIMv2 BSR Ip pim bsr-border42-20 Ip multicast boundary 42-21 Ip pim bsr-candidate interface-id Hash-mask-length priority42-22 Group-list access-list-number Ip pim rp-candidate interface-id42-23 Using Auto-RP and a BSR Show ip pim rp group-nameGroup-address mapping Show ip pim rp-hash group Configuring Advanced PIM Features Troubleshooting PIMv1 and PIMv2 Interoperability ProblemsMonitoring the RP Mapping Information Understanding PIM Shared Tree and Source Tree 42-26 Shared Tree and Source Tree Shortest-Path Tree Delaying the Use of PIM Shortest-Path Tree Ip pim spt-threshold kbps infinity42-27 Configuring Optional Igmp Features Modifying the PIM Router-Query Message IntervalIp pim query-interval seconds Show ip igmp interface interface-id Default Igmp Configuration Configuring the Switch as a Member of a GroupIp igmp join-group group-address 42-29 Controlling Access to IP Multicast Groups Ip igmp access-group access-list-numberShow ip igmp interface interface-id Verify your entries 42-30 Changing the Igmp Version Modifying the Igmp Host-Query Message IntervalIp igmp version 1 Query-interval or the ip igmp query-max-response-time Changing the Igmp Query Timeout for IGMPv2 Ip igmp querier-timeout secondsIp igmp query-interval seconds 42-32 Configuring the Switch as a Statically Connected Member Changing the Maximum Query Response Time for IGMPv2Ip igmp query-max-response-time 42-33 Configuring Optional Multicast Routing Features Enabling Cgmp Server SupportIp igmp static-group group-address 42-34 Configuring sdr Listener Support Ip cgmp proxy42-35 Ip sdr listen Enable sdr listener support Enabling sdr Listener SupportLimiting How Long an sdr Cache Entry Exists 42-36 Configuring an IP Multicast Boundary 42-37 Configuring Basic Dvmrp Interoperability Features 42-38 Configuring Dvmrp Interoperability 42-39 Ip dvmrp metric metric list 42-40 Configuring a Dvmrp Tunnel 42-41 Access-list-number distance Neighbor-list access-list-numberAdvertising Network 0.0.0.0 to Dvmrp Neighbors Ip dvmrp accept-filter Configuring Advanced Dvmrp Interoperability Features Ip dvmrp default-informationResponding to mrinfo Requests Originate only Enabling Dvmrp Unicast Routing 42-44 Rejecting a Dvmrp Nonpruning Neighbor 42-45 Enter interface configuration mode 42-46 By default, 7000 routes are advertised. The range is 0 to Controlling Route ExchangesLimiting the Number of Dvmrp Routes Advertised Changing the Dvmrp Route Threshold Configuring a Dvmrp Summary Address Default is 10,000 routes. The range is 1 toRoute-count 42-48 42-49 Disabling Dvmrp Autosummarization Ip dvmrp summary-address addressMask metric value No ip dvmrp auto-summary Adding a Metric Offset to the Dvmrp Route Ip dvmrp metric-offset in outIncrement 42-51 Monitoring and Maintaining IP Multicast Routing Clearing Caches, Tables, and DatabasesDisplaying System and Network Statistics 42-52 Monitoring IP Multicast Routing 42-53 42-54 Configuring Msdp Understanding Msdp43-1 Msdp Operation 43-2 Msdp Benefits 43-3 Configuring Msdp Default Msdp ConfigurationConfiguring a Default Msdp Peer 43-4 Ip msdp default-peer ip-address name Prefix-list list43-5 Caching Source-Active State Ip prefix-list name description stringSeq number permit deny network Ip msdp description peer-name Ip msdp cache-sa-state list 43-7 Switchconfig# ip msdp sa-request Requesting Source Information from an Msdp PeerIp msdp sa-request ip-address name 43-8 Controlling Source Information that Your Switch Originates Redistributing SourcesIp msdp redistribute list 43-9 43-10 Name list access-list-number Filtering Source-Active Request MessagesIp msdp filter-sa-request ip-address 43-11 Controlling Source Information that Your Switch Forwards Using a FilterIp msdp sa-filter out ip-address name Route-map map-tag 43-13 Controlling Source Information that Your Switch Receives Using TTL to Limit the Multicast Data Sent in SA MessagesIp msdp ttl-threshold ip-address name Ttl Switchconfig# ip msdp sa-filter in switch.cisco.com Ip msdp sa-filter in ip-address name43-15 Configuring an Msdp Mesh Group Shutting Down an Msdp PeerIp msdp mesh-group name ip-address 43-16 Including a Bordering PIM Dense-Mode Region in Msdp Ip msdp shutdown peer-name peerIp msdp border sa-address interface-id 43-17 Configuring an Originating Address other than the RP Address 43-18 Monitoring and Maintaining Msdp Clear ip msdp peer peer-addressnameClear ip msdp statistics peer-addressname Clear ip msdp sa-cache group-addressname 43-20 Configuring Fallback Bridging Understanding Fallback BridgingFallback Bridging Overview 44-1 44-2 Configuring Fallback Bridging Fallback Bridging and Switch Stacks44-3 Default Fallback Bridging Configuration Fallback Bridging Configuration GuidelinesCreating a Bridge Group 44-4 Bridge bridge-group protocol Vlan-bridgeBridge-group bridge-group 44-5 Adjusting Spanning-Tree Parameters Switchconfig# bridge 10 protocol vlan-bridge44-6 Changing the VLAN-Bridge Spanning-Tree Priority Changing the Interface PriorityBridge bridge-group priority number Bridge-group bridge-grouppriority Assigning a Path Cost Bridge-group bridge-group path-costCost 44-8 Adjusting Bpdu Intervals Switchconfig# bridge 10 hello-timeBridge bridge-group hello-time seconds 44-9 Switchconfig# bridge 10 forward-time Switchconfig# bridge 10 max-ageBridge bridge-group forward-time Bridge bridge-group max-age seconds Monitoring and Maintaining Fallback Bridging Disabling the Spanning Tree on an InterfaceClear bridge bridge-group Show bridge bridge-group group 44-12 Troubleshooting 45-1 Recovering from a Software Failure 45-2 Recovering from a Lost or Forgotten Password Switch flashinitSwitch loadhelper Switch copy xmodem flashimagefilename.bin 45-4 Procedure with Password Recovery Enabled 45-5 Copy the configuration file into memory 45-6 Procedure with Password Recovery Disabled Switch dir flash45-7 Preventing Switch Stack Problems 45-8 Recovering from a Command Switch Failure 45-9 Replacing a Failed Command Switch with a Cluster Member Switchconfig# no cluster commander-address45-10 Replacing a Failed Command Switch with Another Switch 45-11 45-12 Recovering from Lost Cluster Member Connectivity Troubleshooting Power over Ethernet Switch PortsPreventing Autonegotiation Mismatches 45-13 Disabled Port Caused by Power Loss Disabled Port Caused by False Link UpShow controllers power inline privileged Exec command SFP Module Security and Identification Monitoring Temperature Using PingMonitoring SFP Module Status Understanding Ping Switch# ping Executing PingCharacter Description 45-16 Using Layer 2 Traceroute Understanding Layer 2 TracerouteUsage Guidelines 45-17 Using IP Traceroute Displaying the Physical PathUnderstanding IP Traceroute 45-18 Switch# traceroute ip Executing IP TracerouteTraceroute ip host Trace the path that packets take through the network Using TDR Understanding TDR45-20 Using Debug Commands Enabling Debugging on a Specific FeatureRunning TDR and Displaying the Results 45-21 Enabling All-System Diagnostics Redirecting Debug and Error Message Output45-22 Using the show platform forward Command 45-23Udp 10 45-24 Using the crashinfo Files Basic crashinfo Files45-25 Using On-Board Failure Logging Extended crashinfo FilesUnderstanding Obfl 45-26 Configuring Obfl 45-27 Displaying Obfl Information Show logging onboard module45-28 Configuring Online Diagnostics Understanding Online Diagnostics46-1 Configuring Online Diagnostics Scheduling Online DiagnosticsDiagnostic schedule switch Non-disruptive daily hhmm Configuring Health-Monitoring Diagnostics Diagnostic monitor interval switchDiagnostic content command output Diagnostic monitor syslog Diagnostic monitor threshold switch Diagnostic monitor switch number testShow diagnostic content post result Schedule status switch Running Online Diagnostic Tests Starting Online Diagnostic TestsDiagnostic start switch number All basic non-disruptive Displaying Online Diagnostic Tests and Test Results 46-6 Supported MIBs MIB ListCISCO-FTP-CLIENT-MIB CISCO-HSRP-MIB CISCO-IGMP-FILTER-MIB CISCO-RTTMON-MIB CISCO-SMI-MIBETHERLIKE-MIB IEEE8021-PAE-MIB IEEE8023-LAG-MIB IGMP-MIB INET-ADDRESS-MIB IPMROUTE-MIB TCP-MIB UDP-MIB Using FTP to Access the MIB Files Working with the Flash File System Switch# show file systems Displaying Available File Systems Setting the Default File System Field Value Cd newconfigs Displaying Information about Files on a File SystemChanging Directories and Displaying the Working Directory Pwd Mkdir oldconfigs Creating and Removing DirectoriesCopying Files Switch# delete myconfig Deleting FilesCreating, Displaying, and Extracting Files Archive /create destination-url FlashArchive /table source-url Archive /xtract source-url Extract a file into a directory on the flash file systemDirectories are extracted More /ascii /binary /ebcdic Working with Configuration Files Guidelines for Creating and Using Configuration Files Configuration File Types and Location Creating a Configuration File By Using a Text Editor Copying Configuration Files By Using Tftp Downloading the Configuration File By Using Tftp Uploading the Configuration File By Using Tftp Copying Configuration Files By Using FTP Downloading a Configuration File By Using FTP Ip ftp password passwordIp ftp username username Uploading a Configuration File By Using FTP Ftp // username password @ location /directoryFilename systemrunning-config Filename nvramstartup-config Copying Configuration Files By Using RCP Copy systemrunning-configCopy nvramstartup-config Ftp // username password @ location /directory Filename Hostname Switch1 Ip rcmd remote-username User0 Downloading a Configuration File By Using RCP Systemrunning-configNvramstartup-config Ip rcmd remote-username username Clearing Configuration Information Uploading a Configuration File By Using RCPSwitch# copy nvramstartup-config rcp Clearing the Startup Configuration File Deleting a Stored Configuration FileWorking with Software Images Image Location on the Switch File Format of Images on a Server or Cisco.com Copying Image Files By Using Tftp Field Description Preparing to Download or Upload an Image File By Using Tftp Downloading an Image File By Using Tftp Allow-feature-upgrade /directory Archive download-swOverwrite /reload Archive download-sw /directory Uploading an Image File By Using Tftp Archive upload-swTftp //location /directory /image-name .tar Copying Image Files By Using FTP Preparing to Download or Upload an Image File By Using FTP Downloading an Image File By Using FTP Archive download-sw /allow-feature-upgrade Directory /overwrite /reloadFor /directory /image-name1 .tar Directory /image-name2 .tar image-name3 .tar Uploading an Image File By Using FTP Copying Image Files By Using RCP Preparing to Download or Upload an Image File By Using RCP Downloading an Image File By Using RCP File By Using RCP section on page B-31 Or Upload an Image File By Using RCP section on Uploading an Image File By Using RCP Copying an Image File from One Stack Member to Another Rcp // username @ location /directory /image-naMe.tar Archive copy-sw /destination-system Destination-stack-member-number /force-reloadSource-stack-member-number For /destination-system destination-stack-member-number Unsupported Commands Cisco IOS Release 12.237SE Access Control ListsUnsupported Privileged Exec Commands Unsupported Global Configuration Commands Archive Commands ARP CommandsBoot Loader Commands Debug Commands Fallback Bridging Bridge bridge-groupacquireBridge crb Bridge bridge-group domain domain-name bridge irb Hsrp X25 map bridge x.121-address broadcast options-keywords Igmp Snooping Commands Interface CommandsIP Multicast Routing Ip pim accept-rpaddress auto-rpgroup-access-list-number Show ip pim vc group-address name type numberShow ip rtp header-compression type number detail Ip multicast-routing vrf vrf-name Unsupported Privileged Exec or User Exec Commands IP Unicast Routing Unsupported BGP Router Configuration Commands Unsupported VPN Configuration CommandsUnsupported Route Map Commands MAC Address Commands Show cable-diagnostics prbs Test cable-diagnostics prbsMiscellaneous Set tag tag-value NetFlow Commands Msdp Network Address Translation NAT Commands Unsupported Global Configuration CommandUnsupported Policy-Map Configuration Command QoS Unsupported Interface Configuration Command Unsupported User Exec CommandsUnsupported Privileged Exec Command Spanning Tree Numerics IN-1 ACLs IN-2 CDP Lldp RIP EigrpHsrp TACACS+ BGP CidrIN-4 Bpdu IN-5 CDP CEFCgmp CLI CNS IN-7 IN-8 Dhcp DNSIN-9 Snmp TACACS+ UdldVmps Wccp Dhcp option IN-11 DTP IN-12 Dvmrp IN-13 Dynamic ARP inspection IN-14 Lacp IN-15 STP FIBIN-16 Mstp STP FTPIN-17 Https IcmpIN-18 Igmp IN-19 IN-20 IP addresses IN-21 Mbone IN-22 IGP IN-23 IP unicast routing IN-24 ISL IN-25 LLDP-MED IN-26 IN-27 MDA MhsrpIN-28 Msdp IN-29 CST ISTMTU IN-30 NAC IN-31 NSSA, Ospf IN-32 Obfl PBRIN-33 PIM IN-34 Port-based authentication IN-35 Pvid VvidIN-36 Private VLANs IN-37 QoS IN-38 IN-39 RCP IN-40 Radius TACACS+ RFCRmon IN-41 RPS RspanRstp IN-42 SDM IN-43 Snmp IN-44 Span SRRIN-45 SSL VTPIN-46 Stacks, switch IN-47 LLDP-MED Ospf IN-48 STP IN-49 IN-50 System message logging IN-51 IN-52 IN-53 IN-54 VLANs IN-55 VPN VQPIN-56 WTD IN-57 IN-58