[c-nsp] ASR920 LACP and xconnect

Gert Doering gert at greenie.muc.de
Thu Aug 20 15:07:37 EDT 2020


On Thu, Aug 20, 2020 at 06:12:29PM +0000, Eric Van Tol wrote:
> I???m trying to verify something here that is working, but also not working. At some point, we built an LACP bundle to a customer device (2x1G ports) and put it into an EoMPLS setup using xconnect to send it over to another site where they have a 10G single circuit. While the LAG is ???up??? and passing traffic, the ports continuously get removed from the bundle and added back in and there???s obviously a small amount of packet loss that occurs when that happens.

I've been there, and could not make it work (we tried with 2x 10G as
well as 2x 1G).  I have the feeling that it's eating the/some LACP packets.

> If this is confirmed as unsupported, would I be correct in that we would have to separate out the untagged native VLAN into its own, non-xconnect EFP, so as to do proper ???l2protocol peer??? configuration? My only concern there is that the native VLAN needs to be transported along with all other VLANs to the other end of the xconnect so I am not sure right now how we do that, or if we even can.

There's an "encapsulation untagged" or something - it can be done :)

I have not tried to find out whether it's officially supported or
unsupported - ASR920 "what is supported and what not?" documentation is 
not exactly satisfactory.


"If was one thing all people took for granted, was conviction that if you 
 feed honest figures into a computer, honest figures come out. Never doubted 
 it myself till I met a computer with a sense of humor."
                             Robert A. Heinlein, The Moon is a Harsh Mistress

Gert Doering - Munich, Germany                             gert at greenie.muc.de
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