Bruno,
On 25/07/2023 14:39, [email protected] wrote:
Hi all,
IP reachability advertised by IS-IS is often used by other routing and
signaling protocols (e.g., BGP, PIM (rpf vector) LDP, RSVP-TE...). As
such, UPA may affect those protocols.
Has UPA been presented in other WGs in the routing areas?
I believe this would be prudent if not required.
why do you believe so? How is this different to an IGP prefix becoming
unreachable without UPA?
In particular, BGP is (heavily) using reachability of (loopbacks)
addresses advertised in IS-IS in order to evaluate the reachability of
BGP routes and compute their preference.
If UPA is not interpreted the same ways by all routers, forwarding loops
may occur in a hop by hop routed network. (because different routers
would select different paths since they use different information to
select their path)
I don't see a problem, please provide an example.
If an ingress PE decides to switch to an alternate BGP path, how does
that creates any potential loop? And why all egress PEs would need to do
the same?
This is not considered nor discussed in the draft. Quite the contrary,
draft says that recognition, processing and use of UPA is a local
consideration.
yes, and we want to keep it that way.
thanks,
Peter
I would suggest to at minimum present this draft to IDR and gets the
feedback from the IDR WG.
--Bruno
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