nanog mailing list archives
Re: Devil's Advocate - Segment Routing, Why?
From: James Bensley <jwbensley+nanog () gmail com>
Date: Tue, 30 Jun 2020 19:30:46 +0100
On Wed, 17 Jun 2020 at 22:09, <adamv0025 () netconsultings com> wrote:
From: NANOG <nanog-bounces () nanog org> On Behalf Of Mark Tinka Sent: Wednesday, June 17, 2020 6:07 PM I've heard a lot about "network programmability", e.t.c.,First of all the "SR = network programmability" is BS, SR = MPLS, any programmability we've had for MPLS since ever works the same way for SR.
It works because SR != MPLS. SR is a protocol which describes many aspects, such as how traffic forwarding decisions made at the ingress node to a PSN can be guaranteed across the PSN, even though the nodes along the PSN path use per-hop forwarding behaviour and different nodes along the path have made different forwarding decisions. When using SR MPLS segment IDs are used as an index into the label range (SRGB) and so SIDs don't correlate 1:1 to MPLS labels, equally with SRv6 the segment IDs are encoded as IPv6 addresses and don't correlate 1:1 to an IPv6 address. There is a venn diagram with an overlapping section in the middle which is "generic SR" with a bunch of core features that are supported agnostic of the encoding mechanism. Cheers, James.
Current thread:
- Re: Devil's Advocate - Segment Routing, Why?, (continued)
- Re: Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 18)
- RE: Devil's Advocate - Segment Routing, Why? adamv0025 (Jun 18)
- Re: Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 18)
- RE: Devil's Advocate - Segment Routing, Why? adamv0025 (Jun 18)
- Re: Devil's Advocate - Segment Routing, Why? Robert Raszuk (Jun 18)
- Re: Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 18)
- Re: Devil's Advocate - Segment Routing, Why? Saku Ytti (Jun 18)
- Re: Devil's Advocate - Segment Routing, Why? James Bensley (Jun 30)
- RE: Devil's Advocate - Segment Routing, Why? adamv0025 (Jun 17)
- Re: Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 17)
- Re: Devil's Advocate - Segment Routing, Why? James Bensley (Jun 30)
- Re: [c-nsp] Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 17)
- Re: Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 30)