• PVSTAG does not support:
• Physical interfaces configured in L2 mode
• Subinterface configured with a default encapsulation (encapsulation default)
• Subinterfaces configured to match any VLAN (encapsulation dot1q any)
For more information about configuring L2 subinterfaces, refer to the Implementing Point to Point Layer 2
Services module.
Verifying PVSTAG
These show commands allow you to verify the operation of PVSTAG or PVRSTAG:
• show spanning-tree pvstag mst-name
• show spanning-tree pvstag mst-name
In particular, these commands display the subinterface that is being used for each VLAN.
Configuring PVRST
Before you begin
Ensure that:
• L2transport subinterfaces with VLAN encapsulation are defined.
• L2VPN bridge domains under bridge group for every VLAN running spanning tree are configured, and
corresponding l2transport subinterfaces are configured in the bridge-domain.
SUMMARY STEPS
1. configure
2. spanning-tree pvrst protocol-instance-name
3. apply-group group_name group_name
4. forward-delay seconds
5. maximum age seconds
6. transmit hold-count count
7. vlan vlan_id
8. Use the commit or end command.
DETAILED STEPS
Step 1 configure
Example:
RP/0/RSP0/CPU0:router# configure
L2VPN and Ethernet Services Configuration Guide for Cisco ASR 9000 Series Routers, IOS XR Release 6.3.x
447
Implementing Multiple Spanning Tree Protocol
Verifying PVSTAG
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