Hi Brian, so far I haven't noticed a proposal to support C-SID in IGP. I think that it brings up a legitimate question: How is it going to work? Would it C-SID be used in combination with dynamic routing protocols or only from a centralized controller?
Regards, Greg On Sun, Oct 24, 2021 at 2:20 PM Brian E Carpenter < [email protected]> wrote: > On 25-Oct-21 09:23, Eliot Lear wrote: > > > > On 24.10.21 21:59, Nick Hilliard wrote: > >> Eliot Lear wrote on 24/10/2021 18:17: > >>> On 24.10.21 17:36, Nick Hilliard wrote: > >>>> The issue is a good deal deeper than just debugging. As long as > >>>> there's an option to specify a variable length parameter without > >>>> being able to specify the length in the protocol, then the protocol > >>>> is fundamentally ambiguous and its interpretation is entirely > >>>> context dependent. > >>> > >>> You mean, like a subnet mask? > >> > >> There's no direct analog here. > > > > Of course there is. You cannot distinguish routing from host without > > looking at external control channels, such as a routing or configuration > > protocol; and you certainly cannot determine the subnet mask of a > > network without that external information, since it's not in the > > packet. And it's not even in the control plane if the route has been > > aggregated. Does that make the information "ambiguous"? The > point is > > that the subnet mask of a network is part of a context that you > > discussed, and you might not have it. > > > > Note- I am not taking a position about CSIDs, but I think this line of > > argument is on the wrong track. > > My assumption has been that within the SRv6 domain, some routing protocol > will be in use (e.g. OSPF) and that (by some magic that I don't understand) > it will be announcing the subnets currently in use, so that bog-standard > routing will occur, including the final hop, because "hosts" supporting > SRv6 will have to function as routers for the final hop. After all, SRv6 > is an overlay, a form of VRF. > > Quite what the magic is that configures OSPF accordingly, I do not know. > > Regards > Brian > Thinking of the IETF standards process: https://xkcd.com/2530/ > > -------------------------------------------------------------------- > IETF IPv6 working group mailing list > [email protected] > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > -------------------------------------------------------------------- >
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