Cisco ASR1K GE 'loopback mac' command

[johnlloyd_13]

hi,

i'm trying to troubleshooting an ISP circuit in ASR1K and trying to push back the issue to the ISP.

can someone advise if it's possible to perform loopback test in a GE port? i've done this in serial E1 link where you can configure a loopback towards the provider.

what is the function of the 'loopback mac' command under GE interface. is it the same as doing a hard loop towards the provider?

ASR1K(config-if)#loopback ?
mac Loopback towards system at the MAC controller level

ASR1K(config-if)#loopback mac ?
<cr> <cr>

[Giuseppe Larosa]

Hello @johnlloyd_13 ,

loopback MAC should loop towards the router interface controller not in the direction of the provider

>> mac Loopback towards system at the MAC controller level

see the attached document the command provides a local loopback towards the router and allows to verify your side.

The document provides also a suggestion to use two different VRFs to test SFPs and cables on a single router box

Hope to help

Giuseppe