Re: [magma] A size limit of a Multicast Address Specific Query in MLDv2
Indranil Bhattacharya <myselfindranil@gmail.com> Tue, 28 September 2010 10:47 UTC
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Date: Tue, 28 Sep 2010 16:17:41 +0530
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From: Indranil Bhattacharya <myselfindranil@gmail.com>
To: "K.Kawaguchi" <kawaguti@ysknet.co.jp>
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Cc: magma@ietf.org
Subject: Re: [magma] A size limit of a Multicast Address Specific Query in MLDv2
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Hi Kiyoaki Kawaguchi, Yes, I think it should be split up like IS_IN report and all the split up packets should follow 7.6.3.2 of rfc 3810. I have never handled this in code though Thanks, Indranil On Tue, Sep 28, 2010 at 1:08 PM, K.Kawaguchi <kawaguti@ysknet.co.jp> wrote: > Hi all, > > # Only the subject was changed. > > I have another question. > > About a size limit of a Multicast Address Specific Query in MLDv2. > > How is a query transmitted when the number of multicast source > addresses of a query message is limited by the MTU? > > Is a Query split like a Report type IS_IN? > (It isn't a Query like Report type IS_EX, is it?) > > > RFC3810 > ------------------------------------------------------------------------ > 5. Message Formats > > 5.1. Multicast Listener Query Message > > 5.1.10. Number of Sources (N) > > The Number of Sources (N) field specifies how many source addresses > are present in the Query. This number is zero in a General Query or > a Multicast Address Specific Query, and non-zero in a Multicast > Address and Source Specific Query. This number is limited by the MTU > of the link over which the Query is transmitted. For example, on an > Ethernet link with an MTU of 1500 octets, the IPv6 header (40 octets) > together with the Hop-By-Hop Extension Header (8 octets) that > includes the Router Alert option consume 48 octets; the MLD fields up > to the Number of Sources (N) field consume 28 octets; thus, there are > 1424 octets left for source addresses, which limits the number of > source addresses to 89 (1424/16). > > > 5.2. Version 2 Multicast Listener Report Message > > 5.2.15. Multicast Listener Report Size > > If the set of Multicast Address Records required in a Report does not > fit within the size limit of a single Report message (as determined > by the MTU of the link on which it will be sent), the Multicast > Address Records are sent in as many Report messages as needed to > report the entire set. > > If a single Multicast Address Record contains so many source > addresses that it does not fit within the size limit of a single > Report message, then: > > o if its Type is not IS_EX or TO_EX, it is split into multiple > Multicast Address Records; each such record contains a different > subset of the source addresses, and is sent in a separate Report. > > o if its Type is IS_EX or TO_EX, a single Multicast Address Record > is sent, with as many source addresses as can fit; the remaining > source addresses are not reported. Although the choice of which > sources to report is arbitrary, it is preferable to report the > same set of sources in each subsequent report, rather than > reporting different sources each time. > > Best Regards > -- > Kiyoaki Kawaguchi > > _______________________________________________ > magma mailing list > magma@ietf.org > https://www.ietf.org/mailman/listinfo/magma >
- Re: [magma] MLDv2 router in the presence of MLDv1… K.Kawaguchi
- [magma] A size limit of a Multicast Address Speci… K.Kawaguchi
- [magma] MLDv2 router in the presence of MLDv1 Mul… K.Kawaguchi
- Re: [magma] MLDv2 router in the presence of MLDv1… Indranil Bhattacharya
- [magma] MLDv2 router in the presence of MLDv1 Mul… K.Kawaguchi
- Re: [magma] A size limit of a Multicast Address S… Indranil Bhattacharya
- Re: [magma] MLDv2 router in the presence of MLDv1… Kunal Shah
- Re: [magma] A size limit of a Multicast Address S… K.Kawaguchi