Hi, Robert:
Aijun Wang China Telecom > On Jan 25, 2022, at 17:36, Robert Raszuk <[email protected]> wrote: > > > Aijun, > >> On Tue, Jan 25, 2022 at 10:30 AM Aijun Wang <[email protected]> >> wrote: >> Hi, Robert: >> >> >> >> So the main point here is that yes it is highly recommended to use summaries >> across areas. But what's not clear (at least to me) is if we really need to >> signal node liveness in IGP to accomplish the ultimate goal of few sec >> connectivity restoration upon PE failure in the cases of redundant egress >> connectivity. >> >> [WAJ] I think the goal is same as that we invented the BFD for BGP, or BFD >> for other protocol. We have discussed several rounds that why we don’t want >> to reply on BFD for the previous mentioned two categories scenarios. >> > > > You are completely missing the point. I never mentioned BFD. BFD is not > needed in neither X nor Y options listed in my note. [WAJ] X aims to how to withdraw the VPN prefixes with the mentioned extended communities, right? Y aims to how assist the RR get the prefix cost from one node that other than the RR itself. Right? I think they all don’t answer the questions how to detect the failure of BGP peer. Right? For this requirement, you can only depend on the BGP hello timers, or BFD for BGP. Right? What I try to answer is your question for the “ultimate goal”. > > >> Especially as some folks apparently still believe that "BGP is slow" and >> that iBGP def timers of 180 sec are even relevant to the topic. They are >> clearly not. >> >> [WAJ] What we are discussing is that the “BGP Peer Status Detection(BGP’s >> hello timer)” is slow. For tunnel services, there is no timers at all. >> > > > And the fundamental observation is that “BGP Peer Status Detection(BGP’s > hello timer)” is absolutely irrelevant to neither X nor Y. [WAJ]Yes. Then can I stated that X or Y is irrelevant to the discussed questions? > > If you and/or others do not understand this basic premise then we have an > issue. > > And for tunnel services with no BGP there is other layer controlling the > service. Tunnel all by itself is pretty useless. [WAJ] For SRv6 tunnel services, which layer control? How? > > Kind regards, > R. >
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