Verify Spanning-Tree Configuration - Cisco ASR 903 Manual

Layer 2 Solution
10
172.16.10.0/24 - SubnetA
ASR903-CE1
Gi0/1/1
Customer A
Site 1
11
172.16.11.0/24 - SubnetB
ASR903-PE1 and ASR903-PE2 Configuration
spanning-tree mode mst
interface GigabitEthernet0/1/1
no ip address
negotiation auto
service instance trunk 1 ethernet
encapsulation dot1q 30-40
rewrite ingress tag pop 1 symmetric
bridge-domain from-encapsulation
!
service instance 2 ethernet
encapsulation untagged
l2protocol peer
bridge-domain 1
interface GigabitEthernet0/1/2
no ip address
negotiation auto
service instance trunk 1 ethernet
encapsulation dot1q 30-40
rewrite ingress tag pop 1 symmetric
bridge-domain from-encapsulation
!
service instance 2 ethernet
encapsulation untagged
l2protocol peer
bridge-domain 1

Verify Spanning-tree Configuration

ASR903-PE1# show span vlan 30
MST0
Spanning tree enabled protocol mstp
Root ID
OL-30526-01
Figure 3. Spanning Tree
10 30 10
ASR903-PE1
Gi0/1/0 Gi0/1/1
Gi0/1/2
11 40 11
Priority 32768
Address 7010.5c51.8fbb
30 10 10
ASR903-PE2
Gi0/1/1 Gi0/1/0 Gi0/1/2
x
Gi0/1/2
40 11 11
! enable MST on the ASR903
! enable l2protocol peering
! enable l2protocol peering
Cisco ASR 903 Router Design and Deployment Guide▄
Spanning-Tree Configuration ▀
10 172.16.10.0/24 – SubnetA
ASR903-CE2
Customer A
Site 2
172.16.11.0/24 – SubnetB
11
17