nanog mailing list archives
Re: Devil's Advocate - Segment Routing, Why?
From: Tom Hill <tom () ninjabadger net>
Date: Wed, 17 Jun 2020 22:46:39 +0100
On 17/06/2020 18:38, Saku Ytti wrote:
Why do we really need SR? Be it SR-MPLS or SRv6 or SRv6+?I don't like this, SR-MPLS and SRv6 are just utterly different things to me, and no answer meaningfully applies to both. I would ask, why do we need LDP, why not use IGP to carry labels? Less state, protocols, SLOC, cost, bug surface And we get more features to boot, with LDP if you want LFA, you need to form tLDP to every Q-space node, on top of your normal LDP, because you don't know label view from anyone else but yourself. With SR by nature you know the label view for everyone, thus you have full LFA coverage for free, by-design. Also by-design IGP/LDP Sync. So no need to justify it by any magic new things, it's just a lot simpler than LDP, you don't need to need new things to justify SR-MPLS, you need to want to do existing things while reducing complexity and state.
Unsurprisingly, there would be no way on Earth that I could have said that better, so you shall find only loud cheering from over here. -- Tom
Current thread:
- Re: [c-nsp] Devil's Advocate - Segment Routing, Why?, (continued)
- Re: [c-nsp] Devil's Advocate - Segment Routing, Why? steve ulrich (Jun 19)
- Re: [c-nsp] Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 19)
- Message not available
- Re: [c-nsp] Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 20)
- Message not available
- Re: [c-nsp] Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 20)
- Re: Devil's Advocate - Segment Routing, Why? Anoop Ghanwani (Jun 19)
- Re: Devil's Advocate - Segment Routing, Why? Robert Raszuk (Jun 19)
- Re: Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 20)
- Re: Devil's Advocate - Segment Routing, Why? Sabri Berisha (Jun 20)
- Re: Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 21)
- Re: Devil's Advocate - Segment Routing, Why? Owen DeLong (Jun 20)
- Re: Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 17)
- Re: Devil's Advocate - Segment Routing, Why? Saku Ytti (Jun 17)
- 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? Mark Tinka (Jun 18)