Interface Last TC Reason Count
------------ ------------------- -------------------------------- -----
Gi0/0/0/1 18:03:24 2009-07-14 Gi0/0/0/1.10 egress TCN 65535
Gi0/0/0/2 21:05:04 2009-07-15 Gi0/0/0/2.1234567890 ingress TCN 2
Configuring PVSTAG: Examples
This example shows PVSTAG configuration for a single VLAN on a single interface:
config
spanning-tree pvstag example
preempt delay for 60 seconds
interface GigabitEthernet0/0/0/0
vlan 10
root-priority 0
root-id 0.0.0
root-cost 0
priority 0
bridge-id 0.0.1
port-priority 0
port-id 1
max age 40
hello-time 1
!
!
!
This example shows the output of show spanning-tree pvstag:
# show spanning-tree pvstag interface GigabitEthernet0/0/0/1
GigabitEthernet0/0/0/1
VLAN 10
Preempt delay is disabled.
Sub-interface: GigabitEthernet0/0/0/1.20 (Up)
Max Age: 20
Root Priority: 0
Root Bridge: 0000.0000.0000
Cost: 0
Bridge Priority: 32768
Bridge ID: 6161.6161.6161
Port Priority: 128
Port ID: 1
Hello Time: 2
Active: no
BPDUs sent: 0
Topology Changes: 123
VLAN 20
Configuring PVSTAG on a Cluster with a Satellite: Example
This example shows application of PVSTAG in a cluster illustrated in the following network topology diagram,
For higher scale fanout, the cluster has satellite switches. The cluster provides L3 termination through a routed
interface (BVI). There is no VPLS in the core. PVSTAG is configured in this scenario with the single purpose
of eliminating full spanning tree from the cluster.
To simplify this PVSTAG example, there is only one access switch in the network topology. In a real scenario,
you can replace this with a ring of access switches.
L2VPN and Ethernet Services Configuration Guide for Cisco ASR 9000 Series Routers, IOS XR Release 6.3.x
458
Implementing Multiple Spanning Tree Protocol
Configuring PVSTAG: Examples
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