Specifying the Link Type | Cisco Systems N3KC3064TFAL3 guide

Configuring Rapid PVST+

Configuring the Rapid PVST+ Forward Delay Time for a VLAN

Configuring the Rapid PVST+ Forward Delay Time for a VLAN

You can configure the forward delay time per VLAN when using Rapid PVST+.

Procedure

	Command or Action	Purpose
Step 1	switch# configure terminal	Enters configuration mode.
Step 2	switch(config)# spanning-tree vlan	Configures the forward delay time of a VLAN. The
	vlan-range forward-timeforward-time	forward delay time value can be from 4 to 30
		seconds, and the default is 15 seconds.

This example shows how to configure the forward delay time for a VLAN:

switch# configure terminal

switch(config)# spanning-tree vlan 5 forward-time 21

Configuring the Rapid PVST+ Maximum Age Time for a VLAN

You can configure the maximum age time per VLAN when using Rapid PVST+.

Procedure

	Command or Action	Purpose
Step 1	switch# configure terminal	Enters configuration mode.
Step 2	switch(config)# spanning-tree vlan	Configures the maximum aging time of a VLAN.
	vlan-range max-agemax-age	The maximum aging time value can be from 6 to 40
		seconds, and the default is 20 seconds.

This example shows how to configure the maximum aging time for a VLAN:

switch# configure terminal

switch(config)# spanning-tree vlan 5 max-age 36

Specifying the Link Type

Rapid connectivity (802.1w standard) is established only on point-to-point links. By default, the link type is controlled from the duplex mode of the interface. A full-duplex port is considered to have a point-to-point connection; a half-duplex port is considered to have a shared connection.

If you have a half-duplex link physically connected point-to-point to a single port on a remote switch, you can override the default setting on the link type and enable rapid transitions.

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

OL-26590-01

85

Image 99

Cisco Systems N3KC3064TFAL3 manual Configuring the Rapid PVST+ Forward Delay Time for a Vlan, Specifying the Link Type

Contents

First Published February 29 Last Modified March 22 Americas HeadquartersPage 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 Convention Description PrefaceAudience Document Conventions Italic screen font Release Notes Installation and Upgrade GuidesConfiguration Guides Error and System Messages Obtaining Documentation and Submitting a Service Request Changed Release Feature Description Added orSwitching mode. There are two switching New and Changed Information for this Release OL-26590-01 This chapter contains the following sections Layer 2 Ethernet Switching OverviewOverview VLANs Private VLANs Spanning TreeSTP Overview STP Extensions Rapid PVST+ Overview STP Extensions Configuring Ethernet Interfaces About the Interface CommandInformation About Ethernet Interfaces About the Unidirectional Link Detection Parameter Udld Aggressive and Nonaggressive Modes Default Udld ConfigurationFollowing table shows the default Udld configuration Feature About Interface Speed About the Error-Disabled StateDefault CDP Configuration Following table shows the default CDP configuration About Port Profiles Configuring Ethernet InterfacesAbout the Debounce Timer Parameters About MTU Configuration Aggressive Configuring the Udld ModeCommand or Action Purpose Step Switch# configure terminal Running-config startup-config Changing an Interface Port ModeCommand or Action Running-config bootflash Configuring Interface Speed Slot /portTransceiver inserted into it Disabling Link Negotiation Command or Action Purpose Serial-number system-name Configuring the CDP CharacteristicsAdvertise v1 Device-id mac-address Seconds Enabling or Disabling CDP Example Enabling the Error-Disabled Detection Copy running-config startup-config Enabling the Error-Disabled RecoveryConfiguring the Error-Disabled Recovery Interval Config t Enters configuration mode Show interface status err-disabled Configuring the Debounce TimerConfiguring the Description Parameter Errdisable recovery interval interval Switchconfig-if# shutdown Disables the interface Displaying Interface InformationDisabling and Restarting Ethernet Interfaces Command Purpose Displaying Input Packet Discard Information Following example shows how to display the CDP neighbors Parameter Default Setting Default Physical Ethernet SettingsPage OL-26590-01 Configuring VLANs Information About VLANsUnderstanding VLANs VLANs as Logically Defined Networks Vlan Ranges VLANs Numbers Range Usage Creating, Deleting, and Modifying VLANs Guidelines and Limitations for VTP Configuring a VlanAbout the Vlan Trunking Protocol Creating and Deleting a Vlan Configuring a Vlan Vlan-id vlan-rangeVlan vlan-id vlan-range Switchconfig# interface ethernet Adding Ports to a VlanActive suspend Feature interface-vlan Enables the creation of SVIs Configuring a Vlan as a Routed SVISwitchconfig-if# switchport access vlan Configure terminal Enters global configuration mode Configuring a Vlan as a Management SVI Configuring VTPYou can configure routing protocols on this interface Startup-config Vtp passwordShow vtp password Copy running-config Summary Verifying Vlan ConfigurationSwitch# show running-config vlan vlanid vlanrange Switch# show vlan brief id vlanid vlanrange name name Information About Private VLANs Configuring 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 Private Vlan Traffic Flows Associating Primary and Secondary VLANs Private Vlan Port Isolation Private Vlan Promiscuous TrunksPrivate Vlan Isolated Trunks Broadcast Traffic in Private VLANs Enabling Private VLANs Configuring a Private VlanSwitchconfig# feature private-vlan Guidelines and Limitations for 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 Promiscuous Port Configuring an Interface as a Private Vlan Host Port Configuring a Promiscuous Trunk Port Configuring an Isolated Trunk PortConfiguring the Allowed VLANs for Pvlan Trunking Ports Switch# show interface switchport Verifying the Private Vlan ConfigurationConfiguring Native 802.1Q VLANs on Private VLANs Switch# show feature OL-26590-01 Configuring Access and Trunk Interfaces Information About Access and Trunk InterfacesUnderstanding Access and Trunk Interfaces Devices in a Trunking Environment Understanding Ieee 802.1Q Encapsulation Header without and with 802.1Q Tag Included Understanding Access VLANs Understanding the Native Vlan ID for Trunk Ports Understanding Allowed VLANsUnderstanding Native 802.1Q VLANs Configuring a LAN Interface as an Ethernet Access Port Configuring Access and Trunk Interfaces On bpdu filtering and bpdu guard Configuring Access Host PortsConfiguring Trunk Ports Switchconfig-if# switchport host Port-channel number Configuring the Native Vlan for 802.1Q Trunking PortsConfiguring the Allowed VLANs for Trunking Ports Specified trunk, use the switchport trunk allowed vlan Switch# configure terminal Enters configuration mode Configuring Native 802.1Q VLANs Switch# show interface Verifying Interface ConfigurationSwitchconfig# no vlan dot1q tag Switch# show vlan dot1q tag native OL-26590-01 Store-and-Forward Switching Mode Configuring Switching ModesInformation About Switching Modes Cut-Through Switching Mode Store-and-Forward Switching Mode Guidelines and Limitations Guidelines and Limitations for Switching ModesLicensing Requirements for Switching Modes Cut-Through Switching Mode Guidelines and Limitations Reenabling Cut-Through Switching Default Settings for Switching ModesConfiguring Switching Modes Enabling Store-and-Forward Switching Feature Name Releases Information Feature History for Switching ModesSaves the change persistently through reboots This example shows how to reenable cut-through switching STP Overview Configuring Rapid PVST+Information About Rapid PVST+ Understanding STP Understanding the Bridge ID Understanding How a Topology is Created 8192 4096 2048 1024 512 256 128 Bit extended system ID field is part of the bridge IDBridge Priority Value Bit Understanding BPDUs Creating the Spanning Tree Topology Election of the Root Bridge Rapid PVST+ Overview Understanding Rapid PVST+ Rapid PVST+ Flag Byte in Bpdu Rapid PVST+ BPDUs Proposal and Agreement Handshaking for Rapid Convergence Proposal and Agreement Handshake Protocol Timers Port RolesVariable Description Rapid PVST+ Port State Overview Port States Blocking State Topology? Enabled Blocking Learning Yes Forwarding DisabledSynchronization of Port Roles Operational Status Port State Processing Superior Bpdu Information Port Cost Spanning-Tree Dispute Mechanism Bandwidth Rapid PVST+ and Ieee 802.1Q TrunksRapid PVST+ Interoperation with Legacy 802.1D STP Port Priority Configuring Rapid PVST+ Rapid PVST+ Interoperation with 802.1s MSTEnabling Rapid PVST+ Terminal Mode rapid-pvstSwitch# configure Enabling Rapid PVST+ per Vlan Configuring the Root Bridge ID Spanning-tree mst max-ageconfiguration commands Configuring a Secondary Root Bridge Vlan vlan-list port-priority priority Configuring the Rapid PVST+ Port Priority Vlan vlan-id cost value auto Configuring the Rapid PVST+ Pathcost Method and Port CostConfiguring the Rapid PVST+ Bridge Priority of a Vlan Pathcost method long short Configuring the Rapid PVST+ Hello Time for a Vlan Switchconfig# spanning-tree vlanVlan-range hello-time hello-time Vlan-range forward-time forward-time Configuring the Rapid PVST+ Forward Delay Time for a VlanConfiguring the Rapid PVST+ Maximum Age Time for a Vlan Specifying the Link Type Restarting the Protocol Verifying Rapid PVST+ ConfigurationsSwitch# clear spanning-tree detected-protocol Switch# show running-config spanning-tree all 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 BPDUs MST Regions MST Configuration Information IST, CIST, and CSTIST, CIST, and CST Overview Spanning Tree Operations Between MST Regions Spanning Tree Operation Within an MST Region MST Regions, Cist Regional Roots, and CST Root MST Terminology Boundary Ports Hop Count MST Boundary Ports Spanning-Tree Dispute Mechanism Interoperability with Ieee 802.1D Port Cost and Port Priority Enabling MST Configuring MSTMST Configuration Guidelines You must enable MST Rapid PVST+ is the default Mst configuration Entering MST Configuration ModeSwitchconfig# spanning-tree mode mst Switchconfig# no spanning-tree mode mst 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 Version Name Default MSTI, which is the Cist This example shows how to map Vlan 200 to MstiMapping and Unmapping VLANs to MST Instances For all private VLANs Configuring the Root BridgeSynchronize Same Msti and their associated primary Vlan 104 Configuring the Port Priority Switchconfig# no spanning-tree OptionalMst instance-id root Configuring the Switch Priority Configuring the Port Cost 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, Max-hops hop-count Configuring the Maximum-Hop CountConfiguring Pvst Simulation Globally Mst max-age seconds Configuring Pvst Simulation Per Port Switchconfig-if#spanning-tree mst simulate pvst disable Specified interfaces Verifying MST ConfigurationsRestarts MST on entire switch or Command Understanding STP Port Types Configuring STP ExtensionsAbout STP Extensions Information About STP Extensions Understanding Bpdu Guard Understanding Bridge Assurance Port returns to Is disabledDefault Enable Disable Enabled/Disabled Understanding Bpdu Filtering Understanding Root Guard Understanding Loop Guard Configuring STP Extensions STP Extensions Configuration GuidelinesConfiguring Spanning Tree Port Types Globally Port type network default Port type edge default Edge ports. Edge ports immediately transition to Switchconfig# interface typeSwitchconfig-if# spanning-tree Port type edge Ports. If you enable Bridge Assurance, it automatically Enabling Bpdu Guard GloballyPort type network Enabling Bpdu Guard on Specified Interfaces Filtering is disabled by default Switchconfig-if# no spanning-tree bpduguardEnables Bpdu Filtering by default on all Edge bpdufilter default Bpdufilter enable disable Enabling Bpdu Filtering on Specified InterfacesBpdufilter Enabling Loop Guard Globally Loopguard defaultNormal and network ports. By default, global Loop Guard is disabled Guard loop root none Verifying STP Extension Configuration 126 Configuring Global Lldp Commands Configuring Lldp Ensure that the Lldp feature is enabled on the switch Holdtime reinit timerOptionalswitch# show lldp Displays Lldp configurations Transmit Configuring Interface Lldp Commands This example shows how to display Lldp counters This example shows how to display Lldp timer information Information About MAC Addresses Configuring the MAC Address TableConfiguring MAC Addresses Configuring a Static MAC Address Macaddress vlan vlan-id Configuring the Aging Time for the MAC TableSwitchconfig-# no mac-address-table static Switch# configure terminal Enters global configuration mode Defined in the switch Verifying the MAC Address ConfigurationSwitchconfig# clear mac-address-table dynamic Switch# show mac-address-table aging-time This example shows how to display the current aging time This example shows how to display the MAC address table Information About Igmp Snooping Configuring Igmp Snooping IGMPv1 and IGMPv2 Igmp Snooping Switch IGMPv3 Igmp Snooping QuerierIgmp Forwarding Parameter Description Configuring Igmp Snooping Parameters No ip igmp snooping mrouter vpc-peer-link No ip igmp snooping mrouterSnooping Snooping querier IP-address Snooping explicit-trackingSnooping fast-leave Last-member-query-interval 141 Verifying Igmp Snooping Configuration 142 Information About Traffic Storm Control Configuring Traffic Storm Control Broadcast Suppression Traffic Storm Guidelines and Limitations On the interface. The default state is Configuring Traffic Storm ControlSwitchconfig-if# storm-control broadcast Configures traffic storm control for traffic Parameters Default Traffic Storm Control Example ConfigurationDefault Traffic Storm Settings Verifying Traffic Storm Control Configuration D E Mstp Cist root 93 CIST, described 91 CST 91 Rstp 68, 71, 75, 89 active topology 71 Bpdu VLANs Adding ports to Private Configuring