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[Bier] Comments on draft-chen-bier-frr

"Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net> Fri, 13 November 2020 13:14 UTC

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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: "bier@ietf.org" <bier@ietf.org>, "draft-chen-bier-frr@ietf.org" <draft-chen-bier-frr@ietf.org>, "draft-merling-bier-frr@ietf.org" <draft-merling-bier-frr@ietf.org>
Thread-Topic: Comments on draft-chen-bier-frr
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Date: Fri, 13 Nov 2020 13:14:12 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bier/wZhRiIaG_kCQciEUszRIUXimc5I>
Subject: [Bier] Comments on draft-chen-bier-frr
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Hi,

If I understand it correctly, this draft describes *one internal* implementation of BIER FRR based on unicast FRR, a concept that is already captured in BIER architecture. Therefore, at best it can be an *informational* document.

The described internal implementation is actually not the best way (I understand that is subject to argument). Unicast FRR does not use a separate FIB for FRR - the same FIB is used for both regular forwarding and FRR. Similarly, the same BIFT can be used BIER regular forwarding and FRR - an entry in the FIB has forwarding information for regular forwarding and FRR - as explained in https://tools.ietf.org/html/draft-merling-bier-frr-00.

Jeffrey

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