Cisco ASR 9000 Series Configuration Manuallines page 483

Implementing Multiple Spanning Tree Protocol
MSTI 10
VLAN IDs:
Role:
Bridge Priority:
Port Priority:
Cost:
Root Bridge:
Root Priority:
Topology Changes: 0
This example shows the output of show spanning-tree mstag bpdu interface, which produces details on the
BPDUs being output and received on a given local interface:
RP/0/RSP0/CPU0:router#show spanning-tree mstag foo bpdu interface GigabitEthernet 0/0/0/0
Transmitted:
MSTI 0 (CIST):
ProtocolIdentifier: 0
ProtocolVersionIdentifier: 3
BPDUType: 2
CISTFlags: Top Change Ack
CISTRootIdentifier: priority 8, MSTI 0, address 6969.6969.6969
CISTExternalPathCost: 0
CISTRegionalRootIdentifier: priority 8, MSTI 0, address 6969.6969.6969
CISTPortIdentifierPriority: 8
CISTPortIdentifierId: 1
MessageAge: 0
MaxAge: 20
HelloTime: 2
ForwardDelay: 15
Version1Length: 0
Version3Length: 80
FormatSelector: 0
Name: 6969:6969:6969
Revision: 0
MD5Digest: ac36177f 50283cd4 b83821d8 ab26de62
CISTInternalRootPathCost: 0
CISTBridgeIdentifier: priority 8, MSTI 0, address 6969.6969.6969
CISTRemainingHops: 20
MSTI 1:
MSTIFlags: Master
MSTIRegionalRootIdentifier: priority 8, MSTI 1, address 6969.6969.6969
MSTIInternalRootPathCost: 0
MSTIBridgePriority: 1
MSTIPortPriority: 8
MSTIRemainingHops: 20
This example shows the output of show spanning-tree mstag topology-change flushes, which displays
details about the topology changes that have occurred for each interface:
#show spanning-tree mstag b topology-change flushes
MSTAG Protocol Instance b
L2VPN and Ethernet Services Configuration Guide for Cisco ASR 9000 Series Routers, IOS XR Release 6.3.x
40
Root (Edge mode)
32768
128
200000000
6161.6161.6161
61440
0
Agreement 1
Forwarding 1
Learning 1
Role 3
Proposal 0
Topology Change 0
0
Agreement 1
Forwarding 1
Learning 1
Role 3
Proposal 0
Topology Change 0
Configuring MSTAG: Examples
457