sr - spring - what's the deal with 2 names

Jeff Tantsura jefftant.ietf at
Thu Sep 10 08:40:30 UTC 2020

SR could be instantiated with 2 data planes, MPLS and IPv6  - SR-MPLS and SRv6 respectively.
MPLS data  plane could be instantiated over either IPv4 or IPv6 (similarly to LDP6), MPLSoUDP->SRoUDP allows  transport of SR-MPLS over IP/UDP(RFC8663) and could be used to build innovative, end2end architectures, e.g.  draft-bookham-rtgwg-nfix-arch.
There is SFC related work, draft-ietf-spring-nsh-sr.

And there’s whole SRv6 thingy...

Let me know if I can help in any way.


> On Sep 10, 2020, at 08:10, aaron1 at wrote:
> Interesting... I've never heard of SPRINGv4
> s/ 
> I found it in the bottom section
> I wonder if SPRINGv4 is like SRv6, meaning, SPRING(SR) over IPv4 dataplane?
> Or, am I reading way too much into that SPRINGv4 acronym?
> -Aaron
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