[bess] Re: A question about withdrawal of EVPN Type 7 and Type 8 routes in RFC 9251

[Alexander Vainshtein <[e-mail]>]

Jorge,
Lots of thanks for your email and apologies for my mistake!

I have re-checked, and found that withdrawal of the Type 7 and Type 8 routes mentioned in your email have been defined in RFC 9251.

Regards,
Sasha

From: Jorge Rabadan (Nokia) <jorge.rabadan=[e-mail]>
Sent: Thursday, July 3, 2025 5:45 PM
To: Alexander Vainshtein <[e-mail]>; Ali Sajassi (sajassi) <[e-mail]>; [e-mail]; [e-mail]; [e-mail]; Wen Lin <[e-mail]>
Cc: BESS <[e-mail]>
Subject: [EXTERNAL] Re: A question about withdrawal of EVPN Type 7 and Type 8 routes in RFC 9251

Hi Sasha,

As you can imagine, they need to be withdrawn when the local state they advertise is no longer present:


https://datatracker.ietf.org/doc/html/draft-sajassi-bess-rfc9251-00#name-local-igmp-mld-membership-r<https://datatracker.ietf.org/doc/html/draft-sajassi-bess-rfc9251-00#name-local-igmp-mld-membership-r>

“When a PE, either DF or non-DF, deletes its local IGMP Membership Request (x,G) state for that (ES,BD),
it MUST withdraw its BGP IGMP Membership Report Synch route for that (ES,BD).”


https://datatracker.ietf.org/doc/html/draft-sajassi-bess-rfc9251-00#section-6.2.2<https://datatracker.ietf.org/doc/html/draft-sajassi-bess-rfc9251-00#section-6.2.2>

“When the Maximum Response Time timer expires, a PE that has advertised an IGMP Leave Synch route withdraws it.”

Hope it helps.
Thanks.
Jorge


From: Alexander Vainshtein <Alexander.Vainshtein=[e-mail]<mailto:Alexander.Vainshtein=[e-mail]>>
Date: Tuesday, July 1, 2025 at 1:42 AM
To: Ali Sajassi (sajassi) <[e-mail]<mailto:[e-mail]>>, [e-mail]<mailto:[e-mail]> <[e-mail]<mailto:[e-mail]>>, [e-mail]<mailto:[e-mail]> <[e-mail]<mailto:[e-mail]>>, [e-mail]<mailto:[e-mail]> <[e-mail]<mailto:[e-mail]>>, Wen Lin <[e-mail]<mailto:[e-mail]>>
Cc: BESS <[e-mail]<mailto:[e-mail]>>
Subject: [bess] A question about withdrawal of EVPN Type 7 and Type 8 routes in RFC 9251

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Hi all,
RFC 9251 defines the rules for advertisement of Type 7 and Type 8 routes, and their processing.
However, I have not found any mention in the RFC of the conditions when these routes are withdrawn by the originating PE.

Does this ever happen? If not, are these routes supposed to stay forever in the BGP In-RIB and Local RIB of the receiving PEs?

Regards, and lots of thanks in advance,
Sasha



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