Cisco ASR 9000 Series Configuration Manuallines page 467
L2vpn and ethernet services configuration guide
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Also See for ASR 9000 Series:
- Command reference manual (1138 pages) ,
- Routing configuration manual (702 pages) ,
- Reference manual (696 pages)
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Implementing Multiple Spanning Tree Protocol
/* Configure MSTAG for a protocol instance called 'foo', with two interfaces facing the
access ring and pre-empt delay of ten seconds */
RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)# spanning-tree mstag foo
RP/0/RSP0/CPU0:router(config-mstag)# preempt delay for 10 seconds
RP/0/RSP0/CPU0:router(config-mstag)# interface GigabitEthernet0/0/0/0
RP/0/RSP0/CPU0:router(config-mstag-if)# exit
RP/0/RSP0/CPU0:router(config-mstag)# interface GigabitEthernet0/0/0/1
RP/0/RSP0/CPU0:router(config-mstag-if)# commit
RP/0/RSP0/CPU0:router(config-mstag-if)# root
/* Configure Uplink Tracking by adding core-facing interfaces under the 'track' keyword */
RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)# spanning-tree mstag foo
RP/0/RSP0/CPU0:router(config-mstag)#track
RP/0/RSP0/CPU0:router(config-mstag-track)# interface GigabitEthernet0/0/0/2
RP/0/RSP0/CPU0:router(config-mstag-track)# interface GigabitEthernet0/0/0/3
RP/0/RSP0/CPU0:router(config-mstag-track)# commit
/* When pre-empt timer is zero, traffic flows through interface GigabitEthernet0/0/0/3 as
soon as this interface comes up.*/
/* In this configuration, pre-empt delay is set to 10 seconds. Traffic flows through interface
GigabitEthernet0/0/0/3, ten seconds after this interface comes up. */
Running Configuration
configure
spanning-tree mstag foo
!
!
Verification
Verify the core connectivity status. The following example shows the state of the interfaces that connect the
core.
RP/0/0/CPU0:ios#show spanning-tree mstag foo tracked
Core Connectivity Available: True
Tracked Items:
Interface Name
-----------------------------------------------
GigabitEthernet0/0/0/3
GigabitEthernet0/0/0/2
-----------------------------------------------
interface GigabitEthernet 0/0/0/0
!
interface GigabitEthernet 0/0/0/1
!
track
interface GigabitEthernet 0/0/0/2
interface GigabitEthernet 0/0/0/3
!
pre-empt delay for 10 seconds
L2VPN and Ethernet Services Configuration Guide for Cisco ASR 9000 Series Routers, IOS XR Release 6.3.x
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