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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter 10 Configuring Ethernet OAM
Understanding Ethernet Loopback
Restrictions
• Ethernet loopback is not supported on a routed port.
• A single terminal session is initiated at a time over a cross connect or bridge domain.
• The maximum total traffic that can be looped back across all sessions combined, is 1GB.
• For an internal loopback over bridge domain, the traffic for loopback must have encapsulation that
matches the egress encapsulation. If there is a rewrite operation on the egress EFP, the traffic post
the operation must match the EFP encapsulation.
• Dot1q tag-based filtering is not available on the Cisco ASR 901 router.
• Internal Loopback over bridge domain cannot be initiated if SPAN is already active.
• Internal Loopback over bridge domain cannot be initiated if Traffic generator is already active.
• Loopback is not supported on Fast Ethernet interface.
• External loopback is not supported on EFP with VLAN range.
• Source and destination address specified in the EXEC command are the MAC fields. These
addresses are used for MAC swap. The source and destination MAC addresses cannot be identical
or multicast MAC addresses.
• Source MAC address is mandatory.
• External loopback is only supported over bridge domain.
• Internal loopback is not supported over a port-channel interface
• When Ethernet Loopback is enabled, the L2CP forward and L2CP tunnel protocols are not
functional on any ports.
• Internal loopback over cross connect cannot be initiated if the Traffic Generator is already active.
Enabling Ethernet Loopback
Complete the following steps to configure Ethernet Loopback on the Cisco ASR 901 router:
SUMMARY STEPS
1. configure terminal
2. interface type number
3. service instance instance-number ethernet
4. encapsulation dotlq-number
5. rewrite ingress tag pop 1 symmetric
6. [bridge domain-number | xconnect peer-ip-address vc-id encapsulation mpls]
7. ethernet loopback permit [external | internal]
8. end
9. ethernet loopback start local interface interface-name service instance instance-number
{external | internal} source mac-address source-mac-address [destination mac-address
destination-mac-address] [timeout {time-in-seconds | none}]
10. ethernet loopback stop local interface type number id session id