Re: [Bier] adoption call for draft-zzhang-bier-multicast-as-a-service

"Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net> Fri, 17 June 2022 15:18 UTC

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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: duanfanghong <duanfanghong=40huawei.com@dmarc.ietf.org>, "EXT-zhang.zheng@zte.com.cn" <zhang.zheng@zte.com.cn>, "bier@ietf.org" <bier@ietf.org>
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Thread-Topic: [Bier] adoption call for draft-zzhang-bier-multicast-as-a-service
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Date: Fri, 17 Jun 2022 15:18:25 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bier/EJ3E7RqmslbkIvx9FJ7RJn3zgcw>
Subject: Re: [Bier] adoption call for draft-zzhang-bier-multicast-as-a-service
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Hi Fanghong,

Thanks for your comments. Please see zzh> below.

-----Original Message-----
From: BIER <bier-bounces@ietf.org> On Behalf Of duanfanghong
Sent: Thursday, June 16, 2022 5:57 AM
To: EXT-zhang.zheng@zte.com.cn <zhang.zheng@zte.com.cn>; bier@ietf.org
Cc: bier-chairs@ietf.org
Subject: Re: [Bier] adoption call for draft-zzhang-bier-multicast-as-a-service

[External Email. Be cautious of content]


I have read this draft and have following comments:

1. In this document, it introduced a RD domain sub-tlv to leak all the client BFR prefixes to provider's backbone. The solution doesn't follows the traditional VPN architecture, and faces the scalable problems in the scenarios with large scale VPNs. And the providers may also don't want to be aware of the client BFR prefixes in backbone.

Zzh> Only the client BFIR/BFER (not internal BFR) prefixes - those with a non-zero BFR-ID) need to be leaked into the provider's backbone, and *only if* the provider wants to provide transit BIER transportation that way (similar to whether a provider want to use selective tunnels to transport MVPN traffic as the selective tunnels are state in provider network but specifically for customer traffic).
Zzh> Consider that a client has 1000 BFIRs/BFERs (no matter how many BFRs it has) connected to a provider via 100 peering points, and client BIER traffic from one client BFIR needs to transit all 100 peering points (incoming on one and outgoing on 99). The provider *has a choice* of distributing 1000 client BFIR/BFER prefixes into its network so that the replication inside its network is efficient, or simply doing ingress replication - tunneling BIER traffic from the incoming peering point to 99 outgoing peering point (which does not involve the procedures in this document).

2. It was recommended in the draft that the RDs of all sites of a specific user VPN should be same, I wonder whether the solution can work if the RDs is distinct, which the author of this draft discussed with me in BESS mailing list for another draft and he insisted that the RDs is distinct in most cases.

Zzh> The draft says:

   *For simplicity*, all BFRs of
   the provider use the same RD that is specifically assigned for the
   customer.

Zzh> Using different RDs certainly work - as long as there is a way to know which routes are for which client (e.g., introducing a sub-tlv for "client-id"). I can clarify that in the draft. However, using different RDs for BIER prefix routes does not have any advantages.
Zzh> The scenario is different from the BGP-MVPN one in the BESS mailing list discussion, where distinct RDs are REQUIRED for Single Forwarder Selection and DESIRED otherwise.

Zzh> Jeffrey

-----Original Message-----
From: BIER [mailto:bier-bounces@ietf.org] On Behalf Of zhang.zheng@zte.com.cn<mailto:zhang.zheng@zte.com.cn>
Sent: Sunday, June 5, 2022 6:19 PM
To: bier@ietf.org<mailto:bier@ietf.org>
Cc: bier-chairs@ietf.org<mailto:bier-chairs@ietf.org>
Subject: [Bier] adoption call for draft-zzhang-bier-multicast-as-a-service

This is the 2-week WG adoption call  for https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-zzhang-bier-multicast-as-a-service/__;!!NEt6yMaO-gk!GyU1JM8mKhn2BJgATtbLqG_6YNjYmuMuPT-xPNaQDAT2f_AKWVA_NoDQyOcwJQ8m3zlPp2UWyxeqIomiyeulTKITwQ-JJ0c2$
Please indicate your support or objection.
Authors, please respond to the list indicating whether you are aware of any IPR that applies to this draft.
Thanks,
Sandy (As WG secretary, on behalf of Greg/Tony)

Juniper Business Use Only

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