Re: [Bier] BIER WG, Call For Agenda, Montreal IETF 105

["Jeffrey (Zhaohui) Zhang" <[e-mail]>]

Hi Jingrong, Liang,

I have some questions and comments on two of the drafts.

draft-xie-bier-ipv6-encapsulation-02

-       Use of BIER multicast address FF0X::AB37 does not seem right to me. For example, on a LAN you can’t multicast BIER packets to multiple downstream BFRs – individual copies (with different BitString) must be unicast to those downstream BFRs.
-       Assuming that we agree that a unicast DA address must be used. What’s the rational of “Source Address field in the IPv6 header MUST be a routable IPv6 unicast address of the BFIR in any case”? Since the IPv6 header is only the outer encapsulation to get a packet from BFR1 to BFR2, why would you want to put the BFIR’s address in the outer encapsulation? If you could make both SA/DA of the IPv6 header to be the original SA/DA of the payload it may make some sense, but obviously you can’t do that.
-       With the above, I don’t see a real difference between this proposal and draft-zhang-bier-bierin6-03 – it’s just whether the BIER header is in the destination option or in the “payload” part of the IPv6 packet. Can you explain the pros and cons of two?

draft-geng-bier-ipv6-inter-domain-00

-       Can you elaborate the following?
   Note: Use of the IPv6 address configured on PE1 to identify an MVPN
   instance can eliminate the need for BFR-id configuration on PE1x,
   which otherwise has to be configured from the space of a sub-domain.
-       For the “peering multicast”, how many BIER sub-domain do you have?
-       What’s the real difference between “hierarchical multicast” and “peering multicast”, once you take away the color and MVPN aspects that I believe are orthogonal here?
-       What’s the significance of “inter-domain” here, that requires this new draft?
-       What’s the uniqueness of IPv6 here?

Thanks!
Jeffrey

From: BIER <[e-mail]> On Behalf Of Xiejingrong
Sent: Monday, July 8, 2019 9:30 PM
To: [e-mail]; BIER WG <[e-mail]>
Cc: '[e-mail]' <[e-mail]>; [e-mail]; [e-mail]; [e-mail]
Subject: Re: [Bier] BIER WG, Call For Agenda, Montreal IETF 105

We’d like to request 35-40 minutes for the presentation of the following BIERv6 drafts.  I will be the speaker (may have some adjustment before the session).

BIERv6 Encapsulation  //  draft-xie-bier-ipv6-encapsulation-02, 15min
BIERv6 via IS-IS  //  draft-xie-bier-ipv6-isis-extension-00  10min
MVPN using BIERv6  //  draft-xie-bier-ipv6-mvpn-01            5min
Inter-domain Multicast Deployment using BIERv6  //  draft-geng-bier-ipv6-inter-domain-00  10min

Thanks
Jingrong on behalf of the authors

From: BIER [mailto:[e-mail]] On Behalf Of Greg Shepherd
Sent: Tuesday, July 09, 2019 3:37 AM
To: BIER WG <[e-mail]<mailto:[e-mail]>>
Subject: [Bier] BIER WG, Call For Agenda, Montreal IETF 105

Please send agenda items with title, draft, speaker name, and requested time to this thread.

Thanks,
Shep
(chairs)

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