Cisco Systems A9014CFD Configuration Example for MST on EVC Bridge Domain, Verification, 13-6

Chapter 13 Configuring MST on EVC Bridge Domain

Contents

	Command	Purpose
Step 4	[no] service instance id Ethernet	Creates a service instance (EVC instance) on an
	[service-name]	interface and sets the device into the config-if-srv
		submode.
	Example:
	Router(config-if)# service instance 101
	ethernet
Step 5	encapsulation dot1q vlan-id	Defines the matching criteria to be used in order to map
		ingress dot1q frames on an interface to the appropriate
	Example:	service instance.
	Router(config-if-srv)# encapsulation
	dot1q 13
Step 6	[no] bridge-domain bridge-id	Binds the service instance to a bridge domain instance
		where bridge-idis the identifier for the bridge domain
	Example:	instance.
	Router(config-if-srv)# bridge-domain 12

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
		Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
	13-6			OL-23826-09