Setting the CDP Transmission Rate | Cisco Systems OL-4580-01

Chapter 7 Configuring the Cisco Discovery Protocol

Setting the CDP Transmission Rate

Setting the CDP Transmission Rate

By default, the frequency at which the CSS transmits CDP packets to all receiving CDP-compatible devices is 60 seconds. To specify the frequency at which the CSS transmits CDP packets to all receiving CDP-compatible devices, use the cdp timer global configuration command. Valid entries are 5 to 254 seconds.

To change the CDP transmission rate for the CSS to 120 seconds, enter:

(config)# cdp timer 120

To reset the CDP timer to the default rate of 60 seconds, enter:

(config)# no cdp timer

Showing CDP Information

Use the show cdp command to display and verify CDP information for the CSS, such as frequency of transmissions and the hold time for transmitted CSS CDP information.

For example:

(config)# show cdp

Global CDP information:

Sending CDP packets every 60 seconds

Sending a holdtime value of 16 seconds

TimeLastCdpSent: 0 days 00:00:30

The following example illustrates the CDP output on a Cisco Catalyst 8540 router using the Cisco IOS show cdp neighbors command.

24-8540-1>show cdp neighbors

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge S -

Switch, H - Host, I - IGMP, r - Repeater

Device ID	Local Intrfce	Holdtme Capability		Platform	Port ID
00-10-58-01-4d-e3	Eth 0	178	R T S	CSS 11050	Eth-Mgmt
SCA043801A5	Eth 0	144	T S	WS-C6009	3/1
25-8540-1	Fas 0/0/7	142	R T	C8540CSR	Fas 0/0/4
25-8540-1	Eth 0	142	R T	C8540CSR	Eth 0
SCA043801HU(bxb11	Eth 0	151	T S	WS-C6009	2/48
00-07-85-43-14-1d	Eth 0	170	R T S	CSS11503	Eth-Mgmt

	Cisco Content Services Switch Routing and Bridging Configuration Guide
7-4	OL-4580-01

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Cisco Systems OL-4580-01 manual Setting the CDP Transmission Rate, Showing CDP Information, Config# no cdp timer

Contents

Software Version January Copyright 2004, Cisco Systems, Inc. All rights reserved N T E N T S Iii Configuring Circuits Showing Circuits Ospf Overview Setting the Retransmission Interval Vii Configuring the Internet Protocol Viii Enabling CDP OL-4580-01 Interface Trunking Between VLANs Xii Field Description for the show bridge port-fast Command Field Descriptions for the show ospf redistribute Command Xiv Preface This guide is organized as follows How to Use This GuideAudience Xvi Related Documentation Xvii Rmon Xviii TACACS+ Xix Symbols and Conventions Ordering Documentation Obtaining DocumentationCisco.com Xxi Cisco Technical Support Website Documentation FeedbackObtaining Technical Assistance Xxii Xxiii Opening a TAC CaseTAC Case Priority Definitions Obtaining Additional Publications and Information Xxiv Xxv Xxvi Configuring Interfaces and Circuits Interface and Circuit Overview OL-4580-01 CSS Interfaces and Circuits # config Interface and Circuit Configuration Quick StartLog in to the CSS Enter configuration mode by typing config Config# interface e1 Config# circuit VLAN1 Optional Display the interface configurationOptional Display the circuit configuration Config# circuit VLAN3 Configuring Interfaces Entering a Description for the Interface Configuring an InterfaceCommand. For example Text string from 1 to 255 characters including spaces Configuring Interface Duplex and Speed To remove an interface description, enter Configuring Interfaces and Circuits Setting Interface Maximum Idle Time Config-if1/1#phy auto-negotiate disable Bridging an Interface to a Vlan Specifying Vlan Trunking for an Interface Config-trunkif2/3# no trunk Selecting a Default Vlan in a Trunk To remove the default Vlan selection, enter Configuring Interfaces and Circuits To restore the default path cost, enter Configuring Spanning-Tree Bridge PathcostConfiguring Spanning-Tree Bridge Port Priority To restore the default port priority of 128, enter To disable the bridge state, enter Configuring Port Fast on an InterfaceConfiguring Spanning-Tree Bridge State Config-ife7#bridge state enable Config# bridge bpdu-guard enabled Config-if2/1#bridge port-fast enableConfig-if2/1#bridge port-fast disable Enabling Port Fast Config# bridge bpdu-guard disabled Showing Port Fast Information Showing Interface Configurations Showing Bridge Configurations Vlan Bridge interface virtual LAN number Field Description Port CSS port Showing Trunking ConfigurationsShowing Interface Information Vlan on the port Showing Interface Duplex and Speed 6describes the fields in the show interface command outputConfig# show phy 2/1 7describes the fields in the show phy command output Showing Interface Statistics That do not have such an address for example, a serial line 8describes the fields in the show mibii command outputInterface address at the protocol layer immediately This object contains an octet string of zero length # clear statistics Integral number of octets in length but do not pass Showing Ethernet Interface ErrorsNumber of frames received on the interface that are an Frame check sequence FCS check Field Description Shutting Down an Interface Shutting Down All Interfaces To shut down all interfaces, enter Restarting an InterfaceRestarting All Interfaces To restart all interfaces, enter Configuring a Circuit IP Interface Configuring CircuitsEntering Circuit Configuration Mode Config# circuit VLAN7 Configuring a Circuit IP Address Configuring a Circuit-IP Broadcast Address Configuring Circuit-IP Redirects Configuring Circuit-IP Unreachables 100 To disable router discovery, enterEnabling and Disabling a Circuit IP Preference To revert to the default of 224.0.0.1, enter Configuring the Router-Discovery LifetimeConfiguring Router-Discovery Limited-Broadcast Max-advertisement-interval Configuring the Router-Discovery Max-Advertisement-IntervalConfiguring the Router-Discovery Min-Advertisement-Interval Min-advertisement-interval To list an individual circuit, enter 10describes the fields in the show circuits command outputShowing Circuits # show ip interfaces Indicates whether RIP is Enabled or DisabledShowing IP Interfaces To stop running the RIP on the interface, enter Configuring RIP for an IP InterfaceEnabling RIP on an IP Interface Configuring RIP Send Version Configuring a RIP Default RouteConfiguring a RIP Receive Version Configuring RIP Packet Logging Showing RIP Configurations for IP Addresses 12describes the fields in the show rip command output # show rip globals # show rip statistics Configuring the Switched Port Analyzer Feature Example of Span Connectivity Configuring Span on a CSS Config# no setspan srcport 3/3 destport 3/12 Verifying the Span Configuration on a CSSConfig# setspan srcport 3/3 destport 3/12 copyBoth Field Description Configuring Spanning-Tree Bridging for the CSS Config# bridge hello-time Config# bridge aging-timeConfig# bridge forward-time CSS Spanning-Tree Bridging Quick Start Set the bridge spanning-tree maximum age, in seconds Configuring Spanning-Tree Bridge Aging-TimeTo restore the default aging time of 300, enter Recommended Display bridge forwarding information To restore the default delay time of 4, enter Configuring Spanning-Tree Bridge Hello-TimeConfiguring Spanning-Tree Bridge Max-Age To restore the default hello time interval of 1, enter Disabling Bridge Spanning-Tree Configuring Spanning-Tree Bridge PriorityTo restore the default maximum age of 6, enter To set the bridge maximum age to 21, enter To reenable spanning-tree bridging, enter Showing Bridge ConfigurationsTo disable spanning-tree bridging, enter Config# bridge spanning-tree disable Field Description OL-4580-01 Configuring Open Shortest Path First Ospf Ospf Overview Ospf Routing Hierarchy Link-State Databases Ospf Routing Hierarchy Boundry Router2 Backbone Area Autonomous SystemAreas Autonomous System Boundary Routers Area Border RoutersStub Area Link-State Databases CSS Ospf Configuration Quick Start Global Ospf Configuration Quick Start Enable Ospf on the CSS Config# circuit VLAN6 Ospf IP Interface Configuration Quick StartAccess global configuration mode. Enter Configure the IP interface as an Ospf interface. Enter # show ospf redistribute Verifying Your Configuration# show ospf global # show ospf advertise To delete the router ID on the CSS, disable Ospf and enter Configuring Ospf on the CSSConfiguring the Ospf Router ID Config# ospf router-id Enabling Ospf Configuring an AreaTo disable OSPF, enter Removing an Area Configuring Equal-Cost RoutesConfiguring Summarized Routes at an ABR To remove the range, enter To remove the CSS as an AS boundary router, enter Advertising a Route as an Ospf ASE Route VIP is Config# ospf advertise 192.168.44.0 Config# no ospf advertise Preceded by an exclamation point Advertising a Default ASE Route Config# ospf default Config# ospf redistribute firewall Config# ospf default metric 10 type1Config# no ospf default Advertising Other Routes Through Ospf Config# no ospf redistribute rip Configuring Ospf on a CSS IP InterfaceConfig# ospf redistribute rip metric 3 type1 To stop advertising the RIP routes via OSPF, enter Configuring the CSS IP Interface as an Ospf Interface Configure this circuit as an Ospf circuit. Enter To disable Ospf on the interface, enter Configuring the Interface AttributesTo reset the interface to the default backbone area, enter Assigning an Ospf Area to the Interface Setting the Hello Packet Interval Setting the CostSetting the Dead Router Interval To remove the Ospf password from the interface, enter Setting the PasswordSetting the Poll Interval For example, to set the poll interval to 200 seconds, enter Setting the Priority of the CSSSetting the Retransmission Interval To set the retransmission interval to 10 seconds, enter Setting the Transit-Link DelayShowing Ospf Information Showing Global Statistics 3describes the fields in the show ospf areas command outputShowing Ospf Area Information To show information about Ospf areas, enter Showing IP Interface Information To show Ospf interfaces, enter Field Field Description Showing Link-State Databases # show ospf lsdb 6describes the fields in the show ospf lsdb command outputTo show the entire database, enter Field Description To show AS-external ASE entries in the LSDB, enter 7describes the fields in the show ospf ase command outputShowing ASE Entries # show ospf ase # show ospf advertise 192.168.11.1/24 Showing the Configured Advertised ASE RoutesTo show the configuration of ASE routes into OSPF, enter Showing the Redistribution Policy Firewall Field Description Showing Ospf Neighbors Showing Summary Route Configuration InformationTo show the summary-route configuration information, enter To show the Ospf neighbors, enter 11 Field Descriptions for show ospf neighbors Command Field Description Field Description Ospf Configuration in a Startup-Configuration File OL-4580-01 Configuring the Address Resolution Protocol Define a static ARP mapping ARP Configuration Quick StartSet the time, in seconds, to wait for an ARP resolution Configuring ARP Mapping Config# no arp To restore the default wait time of 5 seconds, enter Configuring ARP TimeoutConfiguring ARP Wait Config# no arp timeout # clear arp cache Updating ARP ParametersClearing ARP Parameters Show arp configfilemanagement-portsummaryiporhost Showing ARP Information 2describes the fields in the show arp command output # show arp summary # show arp config To display the global ARP configuration, enter4describes the fields in the show arp config command output # show arp file To display the resolution for a host IP address, enter OL-4580-01 Configuring Routing Information Protocol Config# rip advertise 192.168.1.0/24 RIP Configuration Quick StartConfigure the CSS to advertise a route through RIP Config# rip redistribute static Config# no rip advertise 192.168.1.0/24 Configuring RIP AdvertiseConfiguring RIP Redistribute Configuring Equal-Cost RIP Routes Config# no rip equal-cost Showing RIP Configurations 3describes the fields in the show rip globals command output Field Descriptions for the show rip statistics Command OL-4580-01 Configuring the Internet Protocol IP Configuration Quick Start Configuring an IP Route Configuring the Internet Protocol Configuring an IP Route To remove a firewall route, enter For example, to configure a blackhole route, enterTo remove a static route, enter Config# no ip no-implicit-service Disabling an Implicit Service for the Static Route Next HopTo reset the default setting, enter Config# ip source-route Configuring an IP Source RouteConfiguring the IP Record Route Config# no ip source-route To disable box-to-box redundancy, enter Configuring Box-to-Box RedundancyConfiguring IP Equal-Cost Multipath Syntax for this global configuration command is Config# ip ecmp roundrobin Config# ip ecmp no-prefer-ingressConfig# no ip ecmp no-prefer-ingress Config# no ip subnet-broadcast Config# ip uncond-bridging Configuring IP Unconditional BridgingTo restore the default behavior of the CSS, enter Config# no ip uncond-bridging Example of Opportunistic Layer 3 Forwarding Config# no ip opportunistic Showing IP Configuration InformationConfig# ip opportunistic all Config# ip route 0.0.0.0 /0 192.168.1.7 originated-packets Showing IP Global Configuration Parameters Whether RIP is enabled or disabled 4describes the fields in the show ip routes command output Showing IP Routing Information Which the next hop of this route should be reached Showing IP StatisticsIndex value that identifies the local interface through TCP Statistics Icmp Statistics ARP Statistics Resetting IP Statistics Showing a Summary of IP Global Statistics Field Description OL-4580-01 Configuring the Cisco Discovery Protocol Config# cdp timer CDP Configuration Quick StartConfig# cdp holdTime Recommended Display and verify CDP information for the CSS Config# no cdp holdTime Setting the CDP Hold TimeTo disable CDP transmissions on the CSS, enter Enabling CDP Showing CDP Information Setting the CDP Transmission RateConfig# no cdp timer Configuring the Dhcp Relay Agent Optional Verify the Dhcp configuration Dhcp Relay Agent Configuration Quick StartEnable the Dhcp relay agent on the CSS circuit Adding a Dhcp Destination on a Circuit To disable the Dhcp relay agent on the circuit, enterConfig-circuitVLAN2#no dhcp relay-to Enabling and Disabling Dhcp on the Circuit Defining the Hops Field Value for Forwarding Dhcp Messages Displaying the Dhcp Relay ConfigurationConfig# no dhcp-agent max-hops # show dhcp-relay-agent global Field Description OL-4580-01 IN-1 Aging time, configuring for bridgingBpdu guard Displaying information Enabling CLI IN-2 DNS IN-3 IP Ecmp IN-4 IN-5 IN-6 IN-7 IN-8 Switched port analyzer. See also SpanMIB-II interface Ospf global Symbol overview Zero, resetting Ethernet statistics to IN-9 IN-10