Verifying MST Configurations, Command | Cisco Systems N3KC3048TP1GE

Configuring Multiple Spanning Tree

Verifying MST Configurations

Procedure

	Command or Action	Purpose
Step 1	switch# clear spanning-tree detected-protocol	Restarts MST on entire switch or
	[interface interface [interface-num port-channel]]	specified interfaces.

This example shows how to restart MST on the Ethernet interface on slot 2, port 8:

switch# clear spanning-tree detected-protocol interface ethernet 2/8

Verifying MST Configurations

To display MST configuration information, perform one of the following tasks:

Command

Purpose

switch# show running-config spanning-tree [all]

switch# show spanning-tree mst [options]

Displays the current spanning tree configuration.

Displays detailed information for the current MST configuration.

The following example shows how to display current MST configuration:

switch# show spanning-tree mst configuration

%Switch is not in mst mode

Name [mist-attempt]

Revision 1 Instances configured 2 Instance Vlans mapped

-------- ---------------------------------------------------------------------

01-12,14-41,43-4094

113,42

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

Image 126

Cisco Systems N3KC3048TP1GE Verifying MST Configurations, Restarts MST on entire switch or, Specified interfaces, Command

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 Document Conventions PrefaceAudience Convention Description Italic screen font Error and System Messages Installation and Upgrade GuidesConfiguration Guides Release Notes Obtaining Documentation and Submitting a Service Request New and Changed Information for this Release Feature Description Added orSwitching mode. There are two switching Changed Release OL-26590-01 VLANs Layer 2 Ethernet Switching OverviewOverview This chapter contains the following sections Private VLANs Spanning TreeSTP Overview Rapid PVST+ STP Extensions Overview STP Extensions Configuring Ethernet Interfaces About the Interface CommandInformation About Ethernet Interfaces About the Unidirectional Link Detection Parameter Feature Default Udld ConfigurationFollowing table shows the default Udld configuration Udld Aggressive and Nonaggressive Modes Following table shows the default CDP configuration About the Error-Disabled StateDefault CDP Configuration About Interface Speed About MTU Configuration Configuring Ethernet InterfacesAbout the Debounce Timer Parameters About Port Profiles Switch# configure terminal Configuring the Udld ModeCommand or Action Purpose Step Aggressive Running-config bootflash Changing an Interface Port ModeCommand or Action Running-config startup-config Configuring Interface Speed Slot /portTransceiver inserted into it Command or Action Purpose Disabling Link Negotiation Device-id mac-address Configuring the CDP CharacteristicsAdvertise v1 Serial-number system-name Enabling or Disabling CDP Seconds Enabling the Error-Disabled Detection Example Config t Enters configuration mode Enabling the Error-Disabled RecoveryConfiguring the Error-Disabled Recovery Interval Copy running-config startup-config Errdisable recovery interval interval Configuring the Debounce TimerConfiguring the Description Parameter Show interface status err-disabled Switchconfig-if# shutdown Disables the interface Displaying Interface InformationDisabling 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 Configuring VLANs Information About VLANsUnderstanding VLANs Vlan Ranges VLANs as Logically Defined Networks Creating, Deleting, and Modifying VLANs VLANs Numbers Range Usage Creating and Deleting a Vlan Configuring a VlanAbout the Vlan Trunking Protocol Guidelines and Limitations for VTP Configuring a Vlan Vlan-id vlan-rangeVlan vlan-id vlan-range Switchconfig# interface ethernet Adding Ports to a VlanActive suspend Configure terminal Enters global configuration mode Configuring a Vlan as a Routed SVISwitchconfig-if# switchport access vlan Feature interface-vlan Enables the creation of SVIs Configuring a Vlan as a Management SVI Configuring VTPYou can configure routing protocols on this interface Copy running-config Vtp passwordShow vtp password Startup-config Switch# show vlan brief id vlanid vlanrange name name Verifying Vlan ConfigurationSwitch# show running-config vlan vlanid vlanrange Summary Configuring Private VLANs Information About Private VLANs Primary and Secondary VLANs in Private VLANs Private Vlan PortsThree types of Pvlan ports are as follows Primary, Isolated, and Community Private VLANs Associating Primary and Secondary VLANs Private Vlan Traffic Flows Broadcast Traffic in Private VLANs Private Vlan Promiscuous TrunksPrivate Vlan Isolated Trunks Private Vlan Port Isolation Guidelines and Limitations for Private VLANs Configuring a Private VlanSwitchconfig# feature private-vlan Enabling Private VLANs Configuring a Vlan as a Private Vlan Associating Secondary VLANs with a Primary Private VlanCommunity isolated primary Association add secondary-vlan-list Remove secondary-vlan-listAssociation Configuring an Interface as a Private Vlan Host Port Configuring an Interface as a Private Vlan Promiscuous Port Configuring a Promiscuous Trunk Port Configuring an Isolated Trunk PortConfiguring the Allowed VLANs for Pvlan Trunking Ports Switch# show feature Verifying the Private Vlan ConfigurationConfiguring Native 802.1Q VLANs on Private VLANs Switch# show interface switchport OL-26590-01 Configuring Access and Trunk Interfaces Information About 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 the Native Vlan ID for Trunk Ports Understanding Allowed VLANsUnderstanding Native 802.1Q VLANs Configuring Access and Trunk Interfaces Configuring a LAN Interface as an Ethernet Access Port Switchconfig-if# switchport host Configuring Access Host PortsConfiguring Trunk Ports On bpdu filtering and bpdu guard Specified trunk, use the switchport trunk allowed vlan Configuring the Native Vlan for 802.1Q Trunking PortsConfiguring the Allowed VLANs for Trunking Ports Port-channel number Configuring Native 802.1Q VLANs Switch# configure terminal Enters configuration mode Switch# show vlan dot1q tag native Verifying Interface ConfigurationSwitchconfig# no vlan dot1q tag Switch# show interface OL-26590-01 Cut-Through Switching Mode Configuring Switching ModesInformation About Switching Modes Store-and-Forward Switching Mode Cut-Through Switching Mode Guidelines and Limitations Guidelines and Limitations for Switching ModesLicensing Requirements for Switching Modes Store-and-Forward Switching Mode Guidelines and Limitations Enabling Store-and-Forward Switching Default Settings for Switching ModesConfiguring Switching Modes Reenabling Cut-Through Switching This example shows how to reenable cut-through switching Feature History for Switching ModesSaves the change persistently through reboots Feature Name Releases Information Understanding STP Configuring Rapid PVST+Information About Rapid PVST+ STP Overview Understanding How a Topology is Created Understanding the Bridge ID Bit Bit extended system ID field is part of the bridge IDBridge Priority Value 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 Protocol Timers Port RolesVariable Description Port States Rapid PVST+ Port State Overview Blocking State Operational Status Port State Enabled Blocking Learning Yes Forwarding DisabledSynchronization of Port Roles Topology? Processing Superior Bpdu Information Spanning-Tree Dispute Mechanism Port Cost Port Priority Rapid PVST+ and Ieee 802.1Q TrunksRapid PVST+ Interoperation with Legacy 802.1D STP Bandwidth Configuring Rapid PVST+ Rapid PVST+ Interoperation with 802.1s MSTEnabling Rapid PVST+ Enabling Rapid PVST+ per Vlan Mode rapid-pvstSwitch# configure 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 Pathcost method long short Configuring the Rapid PVST+ Pathcost Method and Port CostConfiguring the Rapid PVST+ Bridge Priority of a Vlan Vlan vlan-id cost value auto Configuring the Rapid PVST+ Hello Time for a Vlan Switchconfig# spanning-tree vlanVlan-range hello-time hello-time Specifying the Link Type Configuring the Rapid PVST+ Forward Delay Time for a VlanConfiguring the Rapid PVST+ Maximum Age Time for a Vlan Vlan-range forward-time forward-time Switch# show running-config spanning-tree all Verifying Rapid PVST+ ConfigurationsSwitch# clear spanning-tree detected-protocol Restarting the Protocol Switch# show spanning-tree options Spanning tree configurationThis example shows how to display spanning tree status OL-26590-01 Configuring Multiple Spanning Tree Information About MSTMST Overview MST Regions MST BPDUs MST Configuration Information IST, CIST, and CSTIST, 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 You must enable MST Rapid PVST+ is the default Configuring MSTMST Configuration Guidelines Enabling MST Switchconfig# no spanning-tree mode mst Entering MST Configuration ModeSwitchconfig# spanning-tree mode mst Mst configuration Switchconfig# spanning-tree mst Specifying the MST NameSpanning-tree mst Specifying the MST Configuration Revision Number Specifying the Configuration on an MST RegionInstance-id vlan vlan-range Name Version Default MSTI, which is the Cist This example shows how to map Vlan 200 to MstiMapping and Unmapping VLANs to MST Instances Same Msti and their associated primary Vlan Configuring the Root BridgeSynchronize For all private VLANs 104 Configuring the Port Priority Switchconfig# no spanning-tree OptionalMst instance-id root Configuring the Port Cost Configuring the Switch Priority Configuring the Hello Time Configures the hello time for all MST instances. The helloHello-time seconds Configuring the Forwarding-Delay Time Configuring the Maximum-Aging TimeSwitch is alive. For seconds, the range is from 1 to 10, Mst max-age seconds Configuring the Maximum-Hop CountConfiguring Pvst Simulation Globally Max-hops hop-count Configuring Pvst Simulation Per Port Switchconfig-if#spanning-tree mst simulate pvst disable Command Verifying MST ConfigurationsRestarts MST on entire switch or Specified interfaces Information About STP Extensions Configuring STP ExtensionsAbout STP Extensions Understanding STP Port Types Understanding Bridge Assurance Understanding Bpdu Guard Understanding Bpdu Filtering Is disabledDefault Enable Disable Enabled/Disabled Port returns to Understanding Loop Guard Understanding Root Guard Configuring STP Extensions STP Extensions Configuration GuidelinesConfiguring Spanning Tree Port Types Globally Port type edge default Port type network default Port type edge Switchconfig# interface typeSwitchconfig-if# spanning-tree Edge ports. Edge ports immediately transition to Ports. If you enable Bridge Assurance, it automatically Enabling Bpdu Guard GloballyPort type network Enabling Bpdu Guard on Specified Interfaces Edge bpdufilter default Switchconfig-if# no spanning-tree bpduguardEnables Bpdu Filtering by default on all Filtering is disabled by default Bpdufilter enable disable Enabling Bpdu Filtering on Specified InterfacesBpdufilter Guard is disabled Loopguard defaultNormal and network ports. By default, global Loop Enabling Loop Guard Globally Verifying STP Extension Configuration Guard loop root none 126 Configuring Lldp Configuring Global Lldp Commands Ensure that the Lldp feature is enabled on the switch Holdtime reinit timerOptionalswitch# 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 a Static MAC Address Configuring the MAC Address TableConfiguring MAC Addresses Information About MAC Addresses Switch# configure terminal Enters global configuration mode Configuring the Aging Time for the MAC TableSwitchconfig-# no mac-address-table static Macaddress vlan vlan-id Switch# show mac-address-table aging-time Verifying the MAC Address ConfigurationSwitchconfig# clear mac-address-table dynamic 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 IGMPv3 Igmp Snooping QuerierIgmp Forwarding Configuring Igmp Snooping Parameters Parameter Description No ip igmp snooping mrouter vpc-peer-link No ip igmp snooping mrouterSnooping Last-member-query-interval Snooping explicit-trackingSnooping fast-leave 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 Configures traffic storm control for traffic Configuring Traffic Storm ControlSwitchconfig-if# storm-control broadcast On the interface. The default state is Verifying Traffic Storm Control Configuration Traffic Storm Control Example ConfigurationDefault Traffic Storm Settings 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