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Re: [MBONED] [Msr6] MSR6 BOF 3rd Issue Category: More details are requested about the large scale use cases, including issue 8-11

"Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net> Sat, 29 October 2022 16:31 UTC

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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: Dino Farinacci <farinacci@gmail.com>, Michael McBride <michael.mcbride@futurewei.com>
CC: "Xiejingrong (Jingrong)" <xiejingrong=40huawei.com@dmarc.ietf.org>, Toerless Eckert <tte@cs.fau.de>, BIER WG <bier@ietf.org>, "msr6@ietf.org" <msr6@ietf.org>, "mboned@ietf.org" <mboned@ietf.org>, "pim@ietf.org" <pim@ietf.org>
Thread-Topic: [MBONED] [Msr6] MSR6 BOF 3rd Issue Category: More details are requested about the large scale use cases, including issue 8-11
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Date: Sat, 29 Oct 2022 16:31:02 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mboned/EmgzJF9573xUrtE8rHgO5Z7pWws>
Subject: Re: [MBONED] [Msr6] MSR6 BOF 3rd Issue Category: More details are requested about the large scale use cases, including issue 8-11
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Please see zzh> below.


Juniper Business Use Only

-----Original Message-----
From: Dino Farinacci <farinacci@gmail.com> 
Sent: Friday, October 28, 2022 2:27 PM
To: Michael McBride <michael.mcbride@futurewei.com>
Cc: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>; Xiejingrong (Jingrong) <xiejingrong=40huawei.com@dmarc.ietf.org>; Toerless Eckert <tte@cs.fau.de>; BIER WG <bier@ietf.org>; msr6@ietf.org; mboned@ietf.org; pim@ietf.org
Subject: Re: [MBONED] [Msr6] MSR6 BOF 3rd Issue Category: More details are requested about the large scale use cases, including issue 8-11

[External Email. Be cautious of content]


>> It sounds like a compromise could be to use the bitfield concept introduced by BIER and put those in an IPv6 packet. But the bits describe the oif-list like BIER does and not the receiver hosts. Then you bring the scale down to "the number of interfaces that lead to the edges of this domain".
>
> Bingo. You just described msr6.

Zzh> These are the proposals that I have seen about MSR6 (stateless since it is source routing):
Zzh> 1) Encode replication branches as SIDs in SRH.
Zzh> 2) Encode replication branches as bits (BIER-TE and CGM2).
Zzh> 3) Encode edge routers (who have downstream receivers) as bits (BIER).
Zzh> 2) and 3) are BIER related. In an IPv6 network, the question is where to put the BIER header.
Zzh> One option is that IPv6 is nothing special. Multicast traffic, be it IPv4/IPv6/Ethernet/whatever, is treated as BIER payload, and BIER header comes after a L2 header or tunnel header, whether the tunnel is MPLS, IPv6 or whatever. This is referred to as BIERin6 (BIER in IPv6 network - though it is more accurate to say "Generic, IPv6-agnostic BIER used for IPv6 network").
Zzh> The other option is that BIER header is put into an IPv6 extension header (referred to as BIERv6) - tightly tied to SRv6 (especially when it comes to using BIER to transport overlay/service traffic).

msr6 appears to want to track receivers. And if someone comments "that is one mode but not all modes", then my response is "having too many solution options is an architectural bug".

Zzh> So there is this cleanly-layered BIERin6 mode that is not IPv6 specific and works well for IPv6. Another mode that is intimately tied to IPv6/SRv6.
Zzh> Jeffrey

Zzh> 

;-)

Dino

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