Re: [Int-dir] Int-Dir Review of draft-ietf-softwire-dslite-multicast-12
<mohamed.boucadair@orange.com> Wed, 14 December 2016 12:32 UTC
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From: mohamed.boucadair@orange.com
To: "Lee, Yiu" <Yiu_Lee@comcast.com>, Zhen Cao <zhencao.ietf@gmail.com>, "draft-ietf-softwire-dslite-multicast@tools.ietf.org" <draft-ietf-softwire-dslite-multicast@tools.ietf.org>
Thread-Topic: Int-Dir Review of draft-ietf-softwire-dslite-multicast-12
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Date: Wed, 14 Dec 2016 12:32:40 +0000
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Subject: Re: [Int-dir] Int-Dir Review of draft-ietf-softwire-dslite-multicast-12
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Hi Yiu, I think that we are saying the same thing. As agreed with Zhen, no change is required to the current text. Cheers, Med > -----Message d'origine----- > De : Lee, Yiu [mailto:Yiu_Lee@comcast.com] > Envoyé : mercredi 14 décembre 2016 04:55 > À : BOUCADAIR Mohamed IMT/OLN; Zhen Cao; draft-ietf-softwire-dslite- > multicast@tools.ietf.org > Cc : int-ads@ietf.org; int-dir@ietf.org > Objet : Re: Int-Dir Review of draft-ietf-softwire-dslite-multicast-12 > > Hi Med and Zhen, > > Actually mB4 doesn’t need to do any check. Once decap is done, it will use > the standard IPv4 mcast forwarding rule. If the v4 group address is in the > mroute table, it will be forwarded, if not, it will be dropped. I propose > the following: > > When the mB4 receives an IP multicast packet, it MUST check the group > address and the source address. If the IPv6 multicast group prefix is > mPrefix64 and IPv6 source prefix is uPrefix64, the mB4 MUST decapsulate > the IPv6 header. The decapsulated IPv4 multicast packet will be forwarded > based on standard IPv4 multicast forwarding rule. > > Thanks, > Yiu > > On 12/12/16, 1:45 AM, "mohamed.boucadair@orange.com" > <mohamed.boucadair@orange.com> wrote: > > > > >b) > >6.2. Multicast Data Forwarding > > When the mB4 receives an IPv6 multicast packet, it MUST check the > > group address and the source address. If the IPv6 multicast > group > > prefix is mPrefix64 and the IPv6 source prefix is uPrefix64, the > mB4 > > MUST decapsulate the IPv6 header and forward the IPv4 multicast > > packet through each relevant interface. Otherwise, the mB4 MUST > > silently drop the packet. > >comments: the mB4 not only needs to check the validity of mPrefix and > >uPrefix, but also needs to check if there exists an associated > >MLD/IGMP requests from that prefixes. Only if there was an IGMP > >report associted with this transaction, it will forward such > multicast > >packets. > [Med] This is actually the intent of the last part of the text you > quoted: > > prefix is mPrefix64 and the IPv6 source prefix is uPrefix64, the > mB4 > MUST decapsulate the IPv6 header and forward the IPv4 multicast > packet through each relevant interface. > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > > If no state is found, there won't be any "relevant interface". So the > traffic won't be forwarded. >
- [Int-dir] Int-Dir Review of draft-ietf-softwire-d… Zhen Cao
- Re: [Int-dir] Int-Dir Review of draft-ietf-softwi… mohamed.boucadair
- Re: [Int-dir] Int-Dir Review of draft-ietf-softwi… Zhen Cao
- Re: [Int-dir] Int-Dir Review of draft-ietf-softwi… mohamed.boucadair
- Re: [Int-dir] Int-Dir Review of draft-ietf-softwi… Tim Chown
- Re: [Int-dir] Int-Dir Review of draft-ietf-softwi… Lee, Yiu
- Re: [Int-dir] Int-Dir Review of draft-ietf-softwi… mohamed.boucadair
- Re: [Int-dir] Int-Dir Review of draft-ietf-softwi… Lee, Yiu