[c-nsp] Cisco ASR 9k transporting QinQ traffic

Lukas Tribus luky-37 at hotmail.com
Thu Jul 14 08:48:41 EDT 2016


> wonder if the 4948 is using 8100 for both the outer and inner tags, in 
> which case using dot1ad wouldn't match.

By default Cisco tags with 8100 for both outer and inner tag. Don't expected 1ad unless explicitly requested/configured on the Catalayst.

> Is "rewrite ingress tag pop [1|2] symmetrical" always required?

Required no. But it makes sense to pop the S-Tag, since your requirement is to transport the S-Tag payload, not the transport overhead.

>  l2protocol cpsv tunnel

Don't tunnel, your Catalysts are already tunneling; just forward this traffic on the 9k.

- match dot1q, not 1ad
- pop 1 tag
- don't tunnel l2tp


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