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 <[email protected]> wrote: > > In line possible answers > > Sent from my iPhone > > On Oct 4, 2019, at 8:22 PM, Gyan Mishra <[email protected]> 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 > > IT Network Engineering & Technology > > Verizon Communications Inc. (VZ) > > 13101 Columbia Pike > <https://www.google.com/maps/search/13101+Columbia+Pike?entry=gmail&source=g> > FDC1 > 3rd Floor > > Silver Spring, MD 20904 > > United States > > Phone: 301 502-1347 > > Email: [email protected] > > www.linkedin.com/in/GYAN-MISHRA-RS-SP-MPLS-IPV6-EXPERT > > Sent from my iPhone > > _______________________________________________ > BESS mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/bess >
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