Re: [Bier] What does BIERin6 propose to satisfy the requirements? //RE: draft-ietf-bier-ipv6-requirements-09

"Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net> Wed, 25 November 2020 13:57 UTC

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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: "Xiejingrong (Jingrong)" <xiejingrong@huawei.com>, Gyan Mishra <hayabusagsm@gmail.com>
CC: BIER WG <bier@ietf.org>
Thread-Topic: What does BIERin6 propose to satisfy the requirements? //RE: draft-ietf-bier-ipv6-requirements-09
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Date: Wed, 25 Nov 2020 13:56:48 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bier/ayMjaBiIxJ51Mw_zUfLHm1duqp8>
Subject: Re: [Bier] What does BIERin6 propose to satisfy the requirements? //RE: draft-ietf-bier-ipv6-requirements-09
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Please see zzh> below.

-----Original Message-----
From: Xiejingrong (Jingrong) <xiejingrong@huawei.com>
Sent: Tuesday, November 24, 2020 10:27 PM
To: Gyan Mishra <hayabusagsm@gmail.com>om>; Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>
Cc: BIER WG <bier@ietf.org>
Subject: What does BIERin6 propose to satisfy the requirements? //RE: draft-ietf-bier-ipv6-requirements-09

[External Email. Be cautious of content]


(to make clean, raise a new topic)

I am confused too by the claiming a solution can do everything and it is an "existing" solution, while requesting allocation of IPv6 Next Header / IPv4 Protocol value which is non-trivial.

Zzh> Comparing requesting a "next header" value for BIER, and specifying an IPv6 DOH to encode BIER and standardizing draft-xie-bier-ipv6-mvpn, which is more trivial?
Zzh> I want to point out that w/o draft-xie-bier-ipv6-mvpn, BIERv6 is not complete.

We need to know, what does *the* BIERin6 draft propose, and how does *the* BIERin6 draft satisfy the bier-ipv6-requirements.
Take req-1 as an example, suppose there are PPP-over-SONET(POS, RFC2615) links in an IPv6 network, can the existing RFC8296 solve ? What does *the* BIERin6 draft propose to solve ?

Zzh> How does IP work with POS? PPP header has a proto field - a new code point would be assigned for BIER. That is not IPv6 specific.

Please note in my question the word *the* does not include anything that RFC8296 can solve. Any existing RFC8296 solution is not belonging to *the* BIERin6 proposal. Please tell us *the* BIERin6 proposal.

Zzh> *The* BIERin6 proposal is BIER over L2 and/or tunnels (IPv6 or not). In case of IPv6 tunnels, new code points are needed and that's why it needs to be on standards track, as I already explained.
Zzh> I had also explained already, why BIERin6 needs to explicitly spell out using *existing* solution (concept, not code point) for IPv6 network - we've wasted two years on this.

Thanks
Jingrong

-----Original Message-----
From: Gyan Mishra [mailto:hayabusagsm@gmail.com]
Sent: Wednesday, November 25, 2020 9:34 AM
To: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>
Cc: Alvaro Retana <aretana.ietf@gmail.com>om>; BIER WG <bier@ietf.org>rg>; EXT-zhang.zheng@zte.com.cn <zhang.zheng@zte.com.cn>cn>; Tony Przygienda <tonysietf@gmail.com>om>; draft-ietf-bier-ipv6-requirements <draft-ietf-bier-ipv6-requirements@ietf.org>rg>; gjshep@gmail.com
Subject: Re: draft-ietf-bier-ipv6-requirements-09

Jeffrey

About the two lingering points it does shed light on something that has been disturbing me with the BIERin6 solution.


I thought about this some more and I think what creates a lot of confusion in my mind with BIERin6 solution is the L2/tunnel component.

As the main reason is that the L2/tunnel exists today with RFC 8296 “Non MPLS BIER Ethernet” with the special allocated next header code point to account for BIER next header 0xAB37.

I honestly think the L2 should be removed from the BIERin6 draft so that the optional IPV6 encapsulation is no longer “optional” in the draft as that now is the draft.

This also provides the “IPv6 encapsulation” commonality with BIERv6 at least showing clearly that their is a strive for commonality and parity between the two solutions.

Also the “muddying” of the water is eliminated by removing L2 making the solution crystal clear to operators.


Kind Regards

Gyan


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