Re: [Bier] bier-frr w/ a single bift
"Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net> Wed, 17 March 2021 15:23 UTC
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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: Michael Menth <menth@uni-tuebingen.de>, BIER WG <bier@ietf.org>
Thread-Topic: [Bier] bier-frr w/ a single bift
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Date: Wed, 17 Mar 2021 15:23:05 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bier/yCHzhEO0VgUXlKgmCGyAwc-hIWM>
Subject: Re: [Bier] bier-frr w/ a single bift
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Michael clarified that the "duplicates" does not mean a BFER will receive duplicates, but that a packet may be sent out of a link multiple times - once for normally forwarded traffic and once for FRR'ed traffic. Given that ambiguity, let me call it "redundant" instead. If the backup branch is the alternative path to the same BFR nbr as in the primary branch, then indeed you could send out redundant copies. If the backup branch is the alternative path to the BFER, and if the backup-nbr's F-BM also includes BFERs whose normal path is through the same nbr, then redundant copy won't happen only if one of the affected BFERs happens to have a lower id than the non-affected BFERs (that go through the same "backup" nbr). I don't think we need to worry about that redundant copy even if it happens in the latter case (backup branch is an alternative path to the BFER) - it is transient anyway. In other words, condition 2) is not really necessary. Jeffrey -----Original Message----- From: BIER <bier-bounces@ietf.org> On Behalf Of Michael Menth Sent: Wednesday, March 17, 2021 10:35 AM To: BIER WG <bier@ietf.org> Subject: [Bier] bier-frr w/ a single bift [External Email. Be cautious of content] Hi all, one of the advantages of LFA-based bier-frr is that duplicates may be avoided. However, I think this is only true if we have either 1) failure-spedific bifts (which is not preferred?) or 2) the possibility to first process BFERs which are affected by a failure If assumption 2) is acceptable, I think a single-bift draft for all bier-frr solution is feasible. Comments? Regards Michael -- Prof. Dr. habil. Michael Menth University of Tuebingen Faculty of Science Department of Computer Science Chair of Communication Networks Sand 13, 72076 Tuebingen, Germany phone: (+49)-7071/29-70505 fax: (+49)-7071/29-5220 mailto:menth@uni-tuebingen.de https://urldefense.com/v3/__http://kn.inf.uni-tuebingen.de__;!!NEt6yMaO-gk!QgEyleDd8rFwSesZlYNnOW6nNZZcFvvN00x5qyJv2rIewxMirxNfzN0unVfUToR7$ _______________________________________________ BIER mailing list BIER@ietf.org https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/bier__;!!NEt6yMaO-gk!QgEyleDd8rFwSesZlYNnOW6nNZZcFvvN00x5qyJv2rIewxMirxNfzN0unXKTPyhq$ Juniper Business Use Only
- [Bier] bier-frr w/ a single bift Michael Menth
- Re: [Bier] bier-frr w/ a single bift Jeffrey (Zhaohui) Zhang