[Roll] IPv6 multicast scope 0x03 in trickle-mcast
Ralph Droms <rdroms.ietf@gmail.com> Wed, 13 March 2013 13:37 UTC
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From: Ralph Droms <rdroms.ietf@gmail.com>
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Date: Wed, 13 Mar 2013 09:33:20 -0400
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Subject: [Roll] IPv6 multicast scope 0x03 in trickle-mcast
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WG - To help move the trickle multicast spec along for ZigBee, I applied to IANA for the well-known multicast address for ALL_MPL_FORWARDERS. As part of the review, Stig Venaas (designated expert) pointed out that draft-ietf-roll-trickle-mcast specifies the use of IPv6 multicast scope 0x03, which is currently "reserved" [RFC4291]. Turns out it was never officially defined as "subnet-local scope" in an RFC, although it was identified as such in early IPv6 addressing architecture I-Ds. So, something has to be done to allow MPL to use scope 0x03. Stig, the Internet ADs, 6man co-chairs, roll co-chairs and I discussed the issue, and devised a plan to redefine scope 0x03 to be "unassigned" (like the other unused scope values), and then identify scope 0x03 in draft-ietf-roll-trickle-mcast as a special-purpose use for "trickle multicast networks" (rather than a "subnet"). draft-ietf-roll-trickle-mcast-04 will need to be edited a little, but otherwise I think this plan should meet ZA's requirements. Also, I'll need to publish a 1-paragraph RFC with the new definition of scope 0x03, but that will be a very quick process. The next revision of draft-ietf-roll-trickle-mcast will include the necessary edits. I'll start the process to publish the RFC to redefine scope 0x03 next week. - Ralph