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
