OL-26590-01 | Cisco Systems N3KC3048TP1GE, N3KC3064TFAL3 manual

Configuring Ethernet Interfaces

Default Physical Ethernet Settings

	Cisco Nexus 3000 NX-OS Layer 2 Switching Configuration Guide, Release 5.0(3)U3(1)
26	OL-26590-01

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Cisco Systems N3KC3048TP1GE, N3KC3064TFAL3 manual OL-26590-01

Contents

Americas Headquarters First Published February 29 Last Modified March 22Page N T E N T S Configuring VLANs Configuring Private VLANs Configuring Rapid PVST+ Configuring Multiple Spanning Tree Configuring the Port Priority Configuring Lldp Configuring Igmp Snooping Preface AudienceDocument Conventions Convention Description Italic screen font Installation and Upgrade Guides Configuration GuidesError and System Messages Release Notes Obtaining Documentation and Submitting a Service Request Feature Description Added or Switching mode. There are two switchingNew and Changed Information for this Release Changed Release OL-26590-01 Layer 2 Ethernet Switching Overview OverviewVLANs This chapter contains the following sections Spanning Tree Private VLANsSTP Overview Rapid PVST+ STP Extensions Overview STP Extensions About the Interface Command Configuring Ethernet InterfacesInformation About Ethernet Interfaces About the Unidirectional Link Detection Parameter Default Udld Configuration Following table shows the default Udld configurationFeature Udld Aggressive and Nonaggressive Modes About the Error-Disabled State Default CDP ConfigurationFollowing table shows the default CDP configuration About Interface Speed Configuring Ethernet Interfaces About the Debounce Timer ParametersAbout MTU Configuration About Port Profiles Configuring the Udld Mode Command or Action Purpose StepSwitch# configure terminal Aggressive Changing an Interface Port Mode Command or ActionRunning-config bootflash Running-config startup-config Slot /port Configuring Interface SpeedTransceiver inserted into it Command or Action Purpose Disabling Link Negotiation Configuring the CDP Characteristics Advertise v1Device-id mac-address Serial-number system-name Enabling or Disabling CDP Seconds Enabling the Error-Disabled Detection Example Enabling the Error-Disabled Recovery Configuring the Error-Disabled Recovery IntervalConfig t Enters configuration mode Copy running-config startup-config Configuring the Debounce Timer Configuring the Description ParameterErrdisable recovery interval interval Show interface status err-disabled Displaying Interface Information Switchconfig-if# shutdown Disables the interfaceDisabling and Restarting Ethernet Interfaces Command Purpose Following example shows how to display the CDP neighbors Displaying Input Packet Discard Information Default Physical Ethernet Settings Parameter Default SettingPage OL-26590-01 Information About VLANs Configuring VLANsUnderstanding VLANs Vlan Ranges VLANs as Logically Defined Networks Creating, Deleting, and Modifying VLANs VLANs Numbers Range Usage Configuring a Vlan About the Vlan Trunking ProtocolCreating and Deleting a Vlan Guidelines and Limitations for VTP Vlan-id vlan-range Configuring a VlanVlan vlan-id vlan-range Adding Ports to a Vlan Switchconfig# interface ethernetActive suspend Configuring a Vlan as a Routed SVI Switchconfig-if# switchport access vlanConfigure terminal Enters global configuration mode Feature interface-vlan Enables the creation of SVIs Configuring VTP Configuring a Vlan as a Management SVIYou can configure routing protocols on this interface Vtp password Show vtp passwordCopy running-config Startup-config Verifying Vlan Configuration Switch# show running-config vlan vlanid vlanrangeSwitch# show vlan brief id vlanid vlanrange name name Summary Configuring Private VLANs Information About Private VLANs Private Vlan Ports Primary and Secondary VLANs in Private VLANsThree types of Pvlan ports are as follows Primary, Isolated, and Community Private VLANs Associating Primary and Secondary VLANs Private Vlan Traffic Flows Private Vlan Promiscuous Trunks Private Vlan Isolated TrunksBroadcast Traffic in Private VLANs Private Vlan Port Isolation Configuring a Private Vlan Switchconfig# feature private-vlanGuidelines and Limitations for Private VLANs Enabling Private VLANs Associating Secondary VLANs with a Primary Private Vlan Configuring a Vlan as a Private VlanCommunity isolated primary Remove secondary-vlan-list Association add secondary-vlan-listAssociation Configuring an Interface as a Private Vlan Host Port Configuring an Interface as a Private Vlan Promiscuous Port Configuring an Isolated Trunk Port Configuring a Promiscuous Trunk PortConfiguring the Allowed VLANs for Pvlan Trunking Ports Verifying the Private Vlan Configuration Configuring Native 802.1Q VLANs on Private VLANsSwitch# show feature Switch# show interface switchport OL-26590-01 Information About Access and Trunk Interfaces Configuring Access and Trunk InterfacesUnderstanding Access and Trunk Interfaces Understanding Ieee 802.1Q Encapsulation Devices in a Trunking Environment Understanding Access VLANs Header without and with 802.1Q Tag Included Understanding Allowed VLANs Understanding the Native Vlan ID for Trunk PortsUnderstanding Native 802.1Q VLANs Configuring Access and Trunk Interfaces Configuring a LAN Interface as an Ethernet Access Port Configuring Access Host Ports Configuring Trunk PortsSwitchconfig-if# switchport host On bpdu filtering and bpdu guard Configuring the Native Vlan for 802.1Q Trunking Ports Configuring the Allowed VLANs for Trunking PortsSpecified trunk, use the switchport trunk allowed vlan Port-channel number Configuring Native 802.1Q VLANs Switch# configure terminal Enters configuration mode Verifying Interface Configuration Switchconfig# no vlan dot1q tagSwitch# show vlan dot1q tag native Switch# show interface OL-26590-01 Configuring Switching Modes Information About Switching ModesCut-Through Switching Mode Store-and-Forward Switching Mode Guidelines and Limitations for Switching Modes Licensing Requirements for Switching ModesCut-Through Switching Mode Guidelines and Limitations Store-and-Forward Switching Mode Guidelines and Limitations Default Settings for Switching Modes Configuring Switching ModesEnabling Store-and-Forward Switching Reenabling Cut-Through Switching Feature History for Switching Modes Saves the change persistently through rebootsThis example shows how to reenable cut-through switching Feature Name Releases Information Configuring Rapid PVST+ Information About Rapid PVST+Understanding STP STP Overview Understanding How a Topology is Created Understanding the Bridge ID Bit extended system ID field is part of the bridge ID Bridge Priority ValueBit 8192 4096 2048 1024 512 256 128 Understanding BPDUs Election of the Root Bridge Creating the Spanning Tree Topology Understanding Rapid PVST+ Rapid PVST+ Overview Rapid PVST+ BPDUs Rapid PVST+ Flag Byte in Bpdu Proposal and Agreement Handshake Proposal and Agreement Handshaking for Rapid Convergence Port Roles Protocol TimersVariable Description Port States Rapid PVST+ Port State Overview Blocking State Enabled Blocking Learning Yes Forwarding Disabled Synchronization of Port RolesOperational Status Port State Topology? Processing Superior Bpdu Information Spanning-Tree Dispute Mechanism Port Cost Rapid PVST+ and Ieee 802.1Q Trunks Rapid PVST+ Interoperation with Legacy 802.1D STPPort Priority Bandwidth Rapid PVST+ Interoperation with 802.1s MST Configuring Rapid PVST+Enabling Rapid PVST+ Mode rapid-pvst Switch# configureEnabling Rapid PVST+ per Vlan Terminal Configuring the Root Bridge ID Configuring a Secondary Root Bridge Spanning-tree mst max-ageconfiguration commands Configuring the Rapid PVST+ Port Priority Vlan vlan-list port-priority priority Configuring the Rapid PVST+ Pathcost Method and Port Cost Configuring the Rapid PVST+ Bridge Priority of a VlanPathcost method long short Vlan vlan-id cost value auto Switchconfig# spanning-tree vlan Configuring the Rapid PVST+ Hello Time for a VlanVlan-range hello-time hello-time Configuring the Rapid PVST+ Forward Delay Time for a Vlan Configuring the Rapid PVST+ Maximum Age Time for a VlanSpecifying the Link Type Vlan-range forward-time forward-time Verifying Rapid PVST+ Configurations Switch# clear spanning-tree detected-protocolSwitch# show running-config spanning-tree all Restarting the Protocol Spanning tree configuration Switch# show spanning-tree optionsThis example shows how to display spanning tree status OL-26590-01 Information About MST Configuring Multiple Spanning TreeMST Overview MST Regions MST BPDUs IST, CIST, and CST MST Configuration InformationIST, CIST, and CST Overview Spanning Tree Operation Within an MST Region Spanning Tree Operations Between MST Regions MST Terminology MST Regions, Cist Regional Roots, and CST Root Hop Count Boundary Ports Spanning-Tree Dispute Mechanism MST Boundary Ports Port Cost and Port Priority Interoperability with Ieee 802.1D Configuring MST MST Configuration GuidelinesYou must enable MST Rapid PVST+ is the default Enabling MST Entering MST Configuration Mode Switchconfig# spanning-tree mode mstSwitchconfig# no spanning-tree mode mst Mst configuration Specifying the MST Name Switchconfig# spanning-tree mstSpanning-tree mst Specifying the Configuration on an MST Region Specifying the MST Configuration Revision NumberInstance-id vlan vlan-range Name Version This example shows how to map Vlan 200 to Msti Default MSTI, which is the CistMapping and Unmapping VLANs to MST Instances Configuring the Root Bridge SynchronizeSame Msti and their associated primary Vlan For all private VLANs 104 Switchconfig# no spanning-tree Optional Configuring the Port PriorityMst instance-id root Configuring the Port Cost Configuring the Switch Priority Configures the hello time for all MST instances. The hello Configuring the Hello TimeHello-time seconds Configuring the Maximum-Aging Time Configuring the Forwarding-Delay TimeSwitch is alive. For seconds, the range is from 1 to 10, Configuring the Maximum-Hop Count Configuring Pvst Simulation GloballyMst max-age seconds Max-hops hop-count Configuring Pvst Simulation Per Port Switchconfig-if#spanning-tree mst simulate pvst disable Verifying MST Configurations Restarts MST on entire switch orCommand Specified interfaces Configuring STP Extensions About STP ExtensionsInformation About STP Extensions Understanding STP Port Types Understanding Bridge Assurance Understanding Bpdu Guard Is disabled Default Enable Disable Enabled/DisabledUnderstanding Bpdu Filtering Port returns to Understanding Loop Guard Understanding Root Guard STP Extensions Configuration Guidelines Configuring STP ExtensionsConfiguring Spanning Tree Port Types Globally Port type edge default Port type network default Switchconfig# interface type Switchconfig-if# spanning-treePort type edge Edge ports. Edge ports immediately transition to Enabling Bpdu Guard Globally Ports. If you enable Bridge Assurance, it automaticallyPort type network Enabling Bpdu Guard on Specified Interfaces Switchconfig-if# no spanning-tree bpduguard Enables Bpdu Filtering by default on allEdge bpdufilter default Filtering is disabled by default Enabling Bpdu Filtering on Specified Interfaces Bpdufilter enable disableBpdufilter Loopguard default Normal and network ports. By default, global LoopGuard is disabled Enabling Loop Guard Globally Verifying STP Extension Configuration Guard loop root none 126 Configuring Lldp Configuring Global Lldp Commands Holdtime reinit timer Ensure that the Lldp feature is enabled on the switchOptionalswitch# show lldp Displays Lldp configurations Configuring Interface Lldp Commands Transmit This example shows how to display Lldp timer information This example shows how to display Lldp counters Configuring the MAC Address Table Configuring MAC AddressesConfiguring a Static MAC Address Information About MAC Addresses Configuring the Aging Time for the MAC Table Switchconfig-# no mac-address-table staticSwitch# configure terminal Enters global configuration mode Macaddress vlan vlan-id Verifying the MAC Address Configuration Switchconfig# clear mac-address-table dynamicSwitch# show mac-address-table aging-time Defined in the switch This example shows how to display the MAC address table This example shows how to display the current aging time Configuring Igmp Snooping Information About Igmp Snooping Igmp Snooping Switch IGMPv1 and IGMPv2 Igmp Snooping Querier IGMPv3Igmp Forwarding Configuring Igmp Snooping Parameters Parameter Description No ip igmp snooping mrouter No ip igmp snooping mrouter vpc-peer-linkSnooping Snooping explicit-tracking Snooping fast-leaveLast-member-query-interval Snooping querier IP-address Verifying Igmp Snooping Configuration 141 142 Configuring Traffic Storm Control Information About Traffic Storm Control Traffic Storm Guidelines and Limitations Broadcast Suppression Configuring Traffic Storm Control Switchconfig-if# storm-control broadcastConfigures traffic storm control for traffic On the interface. The default state is Traffic Storm Control Example Configuration Default Traffic Storm SettingsVerifying Traffic Storm Control Configuration Parameters Default D E Mstp Cist root 93 CIST, described 91 CST 91 Rstp 68, 71, 75, 89 active topology 71 Bpdu Adding ports to Private Configuring VLANs