Re: [spring] Spring SR question??

Jeff,

I'm not sure that is what Gyan was asking. He can clarify.

I think Gyan was asking about an environment where:

  *   SR-MPLS runs directly over ethernet. SR-MPLS is not encapsulated in IP or UDP over IP
  *   The SR-MPLS signaling protocol (IS-IS or OSPFv3) does not required IPv4 to be enabled on the network.

                                                                       Ron

Juniper Business Use Only
From: Jeff Tantsura <jefftant.ietf@gmail.com>
Sent: Tuesday, June 23, 2020 7:30 PM
To: Ron Bonica <rbonica@juniper.net>; Gyan Mishra <hayabusagsm@gmail.com>
Cc: SPRING WG <spring@ietf.org>
Subject: Re: [spring] Spring SR question??

[External Email. Be cautious of content]

Gyan,

In SR-MPLS, either over IPv4 or IPv6 the data-plane is MPLS (rfc8660)
If MPLS is tunneled over IP, e.g MPLS over GRE, MPLS over UDP, etc, then data-plane is that of outer encapsulation - rfc8663 as the best example, e.g outer header would be IPv4/IPv6+UDP
Since bindings (SIDs) need to be distributed, you'd need a label distribution protocol, with IPv6 that would be IS-IS, OSPFv3 or BGP (or  controller based).
Vendor support for that is rather limited, I don't recall any.
Other option to distribute label bindings over IPv6 would be LDPv6 + v6 IGP, I recall Junos implementation, there could be more.
There's quite interesting discussion on NANOG - https://mailman.nanog.org/pipermail/nanog/2020-June/208111.html

Hope this helps

Cheers,
Jeff
On Jun 23, 2020, 1:52 PM -0700, Gyan Mishra <hayabusagsm@gmail.com<mailto:hayabusagsm@gmail.com>>, wrote:

Thanks Ron!

Gyan

On Tue, Jun 23, 2020 at 3:51 PM Ron Bonica <rbonica@juniper.net<mailto:rbonica@juniper.net>> wrote:
Gyan,

You can signal SR-MPLS over a network that has IPv6 enabled, but does not have IPv4 enabled.

                                                   Ron

Juniper Business Use Only
From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On Behalf Of Gyan Mishra
Sent: Tuesday, June 23, 2020 1:20 PM
To: SPRING WG <spring@ietf.org<mailto:spring@ietf.org>>
Subject: [spring] Spring SR question??

[External Email. Be cautious of content]

All

SR-MPLS utilizes IPv4 data plane and and can service v4 v6 edges  6to4 softwire mesh framework from the VPN overlay aspect..

Can SR-MPLS use IPV6 data plane?

Reason why I am asking is that it is very simple to get from LDPv4 core to SR-MPLS core.

However if you have an existing brown field SP core and your end goal is to get to SRv6 - how can you easily get there.

So my thoughts are you can use SR-MPLS as a stepping stone so to speak to get to SRv6.

To that end you could use Greg Mirsky draft of tunneling SR-MPLS in SRV6 interoperability and use other inter operability drafts.

But let's say you prefer to get from point A go point B seamlessly and native naturally without any translation.

An analogy would be migratory to IPV6 instead of using translation technology tunnels you dual stand the entire network and use ds-lite or LSN or 6RD to close the gap.

So my thoughts on getting to the "end state" SRv6 are we follows:

MPLS LDPv4

MPLS LDPv6

SR-MPLS v6

Once you have a v6 core and you have decommissioned LDPv6 you now have the v6 data plan ready to go to get to SRv6

SRv6

Only caveat with this idea is I am not sure if SR-MPLS supports IPv6 data plane v6 label binding.

Kind Regards

Gyan

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