[j-nsp] l2circuit between ASR9k and MX80

[Adam Vitkovsky]

Hey Saku,

> Saku Ytti
> Sent: 02 August 2015 11:01
> There are many ways to get functioning EoMPLS on arbitrary and
> mismatching
> SVLAN counts, but only one way to do it, so that you don't need A-B
> intelligence to configure A, which I view as crucial property.
> The way to avoid A-B knowledge is to guarantee that when you send EoMPLS
> frame
> to MPLS core it has exactly 1 SVLAN, which far-end will swap to its own
> SVLAN.
> This way, A does not need to know what is happening in B port. Maybe A has
> 2
> SVLAN (QinQ SVLAN) and B has 0?
>
I still don't understand the rationale behind the preservation of the arbitrary SVLAN tag.
I guess the requirement is setup specific.
I used a word "arbitrary" because 1 SVLAN might mean top SVLAN or bottom SVLAN -depending on the setup.
Also how good is to preserve the SVLAN if the B side pops the SVLAN(s) leaving the frame with just CVLAN tag(s) or no VLAN tag.
In my mind the SVLAN CoS is equivalent of MPLS EXP though I'm aware there might be setups where unique QOS scheme might be required for the L2 Agg network.

adam


        Adam Vitkovsky
        IP Engineer

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