Alcatel-Lucent OmniSwitch 6850-48 Cli Reference Manual page 2900

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Only Layer 2 loopback tests are supported, so test frames are not routed. As a result, the loopback test
operation will only swap the source and destination MAC address of bridged test frames.
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In a typical ingress loopback scenario, specifying the switch base MAC addess as the destination
address is recommended. In a typical egress loopback scenario, a customer premises equipment (CPE)
MAC address can be used, but configuring and using a static MAC address on the egress loopback port
is recommended.
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The port specified for an inward loopback test is the port on which test frames are received and looped
back. The port specified for an outward test is the egress destination port on which test frames are
looped back. The loopback operation performed on the specified port swaps the source and destination
MAC address of the test frame and then forwards the frame back to the test head.
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The switch creates a static MAC address entry for the egress port when the outward loopback profile is
applied on that port.. The static address created is the destination MAC address specified in the profile.
If the switch receives a non-test frame that contains the same MAC address, both the test and non-test
frames are filtered even if they were received on different ports.
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If the MAC addresses specified in the loopback test profile are actual network address (for example,
02:da:95:e1:22:10, not aa:aa:aa:aa:aa:aa), flush the MAC address table for the switch when the loop-
back test is finished.
Examples
The following command examples create an ingress UNI and NNI test profile:
-> loopback-test PE1-inward-UNI source-mac 00:00:00:dd:aa:01 destination-mac
00:00:00:cc:aa:bb vlan 1001 loopback-port 1/1 type inward
-> loopback-test PE2-inward-NNI source-mac 00:00:00:dd:aa:02 destination-mac
00:00:00:cc:aa:bc vlan 1001 loopback-port 2/1 type inward
The following command examples create an egress UNI and NNI test profile:
-> loopback-test PE2-outward-UNI source-mac 00:00:00:dd:ab:01 destination-mac
00:00:00:cc:ab:bb vlan 1001 loopback-port 1/1 type outward
-> loopback-test PE1-outward-NNI source-mac 00:00:00:cc:ab:bb destination-mac
00:00:00:dd:ab:01b vlan 1001 loopback-port 2/1 type outward
The following command examples enable and disable a loopback test profile:
-> loopback-test PE1-outward-UNI enable
-> loopback-test PE1-outward-UNI disable
Release History
Release 6.4.3; command was introduced.
page 44-50
VLAN Stacking Commands
OmniSwitch CLI Reference Guide June 2012