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13-6
Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter 13 Configuring MST on EVC Bridge Domain
Contents
Configuration Example for MST on EVC Bridge Domain
In the following example, two interfaces participate in MST instance 0, the default instance to which all
VLANs are mapped:
Router# enable
Router# configure terminal
Router(config)# interface g0/1
Router(config-if)# service instance 1 ethernet
Router(config-if-srv)# encapsulation dot1q 2
Router(config-if-srv)# bridge-domain 100
Router(config-if-srv)# interface g0/3
Router(config-if)# service instance 1 ethernet
Router(config-if-srv)# encapsulation dot1q 2
Router(config-if-srv)# bridge-domain 100
Router(config-if-srv)# end
Verification
Use this command to verify the configuration:
Router# show spanning-tree vlan 2
MST0
Spanning tree enabled protocol mstp
Root ID Priority 32768
Address 0009.e91a.bc40
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32768 (priority 32768 sys-id-ext 0)
Address 0009.e91a.bc40
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi4/1 Desg FWD 20000 128.1537 P2p
Gi4/3 Back BLK 20000 128.1540 P2p
Step 4
[no] service instance
id
Ethernet
[
service-name
]
Example:
Router(config-if)# service instance 101
ethernet
Creates a service instance (EVC instance) on an
interface and sets the device into the config-if-srv
submode.
Step 5
encapsulation dot1q
vlan-id
Example:
Router(config-if-srv)# encapsulation
dot1q 13
Defines the matching criteria to be used in order to map
ingress dot1q frames on an interface to the appropriate
service instance.
Step 6
[no] bridge-domain
bridge-id
Example:
Router(config-if-srv)# bridge-domain 12
Binds the service instance to a bridge domain instance
where bridge-id is the identifier for the bridge domain
instance.
Command Purpose