Cisco Systems A9014CFD manual 10-54

Chapter 10 Configuring Ethernet OAM

Understanding Ethernet Loopback

	Command or Action	Purpose
Step 9
	ethernet loopback permit external	Configures ethernet permit external loopback on an
		interface. External loopback allows loopback of traffic from
	Example:	the wire side. This command is supported under a service
		instance and interface.
	Router(config-if-srv)# ethernet loopback permit
	external
Step 10
	ethernet loopback permit internal	Configures ethernet permit internal loopback on an
		interface. Internal loopback allows loopback of traffic from
	Example:	the relay side. This command is supported under a service
		instance and interface.
	Router(config-if-srv)# ethernet loopback permit
	internal
Step 11
	end	Returns to privileged EXEC mode.
	Example:
	Router(config-if-srv)# end
Step 12
	ethernet loopback start local interface type	Starts ethernet external or internal loopback process on the
	number service instance instance-number {	service instance. Destination MAC address is an optional
	external internal } source mac-address source	field. If destination mac address is not provided, the
	mac-address[destination mac-address
		loopback interface MAC address is assigned to the source
	destination-mac-address] [timeout
		MAC address after swapping.
	{time-in-seconds none}]
		• (Optional) Use the timeout time-in-secondscommand
	Example:	to set a loopback timeout period. The range is from 1 to
	Router# ethernet loopback start local interface	90000 seconds (25 hours). The default value is 300
	gigabitEthernet 0/1 service instance 10	seconds.
	external source mac-address 0123.4567.89ab	• (Optional) Use the timeout none command to set the
	destination mac-address 255.255.255 timeout
	9000	loopback to no time out.
Step 13
	ethernet loopback stop local interface type	Stops ethernet loopback.
	number id session id
	Example:
	Router# ethernet loopback stop local interface
	gigabitEthernet 0/1 id 3

Configuration Example

This example shows how to configure Ethernet External Loopback for a bridge-domain:

!

interface GigabitEthernet0/0

service instance 201 ethernet evc201 encapsulation dot1q 201

rewrite ingress tag pop 1 symmetric bridge-domain 201

ethernet loopback permit external ethernet loopback permit internal

!

	Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
10-54	OL-23826-09