Re: [bess] SRv6 versus SR-MPLS

Hi Gyan,
you're asking very good questions and your arguments are all correct. But I
think that now there are several proposals that address what is considered
the scalability issue of SRv6. Among these is the Unified SID for SRv6
<https://datatracker.ietf.org/doc/draft-mirsky-6man-unified-id-sr/>. U-SID
benefits from all the advantages SRH provides while adding a higher density
of SIDs thus allowing stricter path control.

Regards,
Greg

On Fri, Oct 4, 2019 at 10:02 PM Gyan Mishra <hayabusagsm@gmail.com> wrote:

>
> In line possible answers
>
> Sent from my iPhone
>
> On Oct 4, 2019, at 8:22 PM, Gyan Mishra <hayabusagsm@gmail.com> wrote:
>
>
> Bess,
>
> What is the benefit of SRv6 over SR-MPLS for greenfield deployments or
> existing mpls deployments.
>
> I think I answered my own question but please chime in with your thoughts..
>
> This NANOG document talks about the state of TE with providers and
> currently the big show stopper with SRv6 which removes it off the table as
> a possibility is the SID depth and larger packet size given that customers
> are set to 9100 and the core is 9216 so when adding in mpls overhead vpn
> labels and Ti-LFA EH insertion at PLR node to PQ node that adding in the
> entire SID list for long TE paths that have huge SID depth makes SRv6 not
> viable at this point.
>
>
> https://pc.nanog.org/static/published/meetings/NANOG73/1646/20180627_Gray_The_State_Of_v1.pdf
>
> For existing implementations it appears from my research a no brainer to
> go with SR-MPLS as that is a painless seamless migration but SRv6 due to
> SID depth issues and given limited head room from customer MTU to the
>  backbone MTU today we are over the limit with larger SID depth for Ti-LFA
> paths or non protected paths.  Until that is addressed SRv6 unfortunately
> may not get much traction with service providers which I think due to the
> SRv6 issues ....uSID and SRv6+ may tend to be more viable and more
> attractive.
>
>
>
>
> Regards,
>
> Gyan Mishra
>
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