[c-nsp] ASR9K to ASR920 MPLS issue

[Saku Ytti]

On Sat, 30 Jan 2021 at 02:51, Jerry Bacon <jerryb at startouch.com> wrote:

> Finally was able to get this all working and tested. As we surmised, it
> works properly either with or without the "rewrite", as long as it's
> symmetrical. So I guess it comes down to a personal or network
> preference. I can see a slight advantage to always doing it, as it
> uncouples the VLAN encapsulation on the two sides.

There is VLAN rewrite, always (except some really old linecards), so
you do not need to have the same VLAN-id on both ends.

You do want to normalise your network to 0 or 1 SVLAN,  so that A end
provisioning is independent of B end provisioning, greatly reducing
complexity and configuration permutations.

I personally like 1 SVLAN normalisation, so that we can carry 802.1p.
This also means, even in port mode, I'll impose additional SVLAN on
the port-mode end, and force the type to VLAN, so that far-side VLAN
mode is unaware that it is interoperating with port mode.


-- 
  ++ytti