Greg,
Those are exactly my questions too.
Regards
Brian
On 25-Oct-21 11:25, Greg Mirsky wrote:
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]
<mailto:[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/
<https://xkcd.com/2530/>
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