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- Editor's note: These minutes have not been edited.
-
- mboned
- 96.12.09 15:30
- Dave Meyer
-
- Administrivia
- o mailing list mboned@ns.uoregon.edu (majordomo)
-
- Status
- o have some active drafts
- - pruning
- - administrative scope
- - will have new issue of seneria
- - Eliz Gentile's Deployment draft
- - RPSL draft on tunnels
- o also need to think about topology data base
- o need to discuss 500k limit and how to raise it
- o need to discuss dynamic address allocation
-
- Pruning Draft
- o was a communication problem between the author and the IESG. has been
- cleaned up and will go to BCP post haste.
- o it was a nice goal statement, but there is no enforcement. what could
- be done? state that the policy will be enforced. the reason this draft
- came about because people wanted to enforce but had no document. this
- provides that.
-
- Scoping Draft
- o was a de facto standard already
- o draft-ietf-mboned-admin-ip-space-00.txt
- o IANA has been asked to enshrine the number assignment
- o what kind of additional admin structure might there be?
- - flat has the advantrage that others may enhance structure
- - reserved scope addresses? SAP us to use highest multicast ddress within
- the scoped range.
- - but the address is large, so making some structure now would give us
- some hierarchical structure for the future
- - as border is bidirectional, hierarchy is out.
- - how about site, country, piece of wire, ...? i.e. geograpic
- - 239-255 was suggested as a local, probably site, scope
- o what about sparse mode or admin join protocols, how are these effected
- by administrative scoping?
- - explicit join model handles this
- - except boundary enforces scope
- - privacy can encrypt
- - except participant list
- - have to make sure that your RP is in same group as scope you are
- using.
- - why is admin scope mechanism linked to the particular protocol?
- - should we define a protocol which lets us discover the scope?
-
- Heartbeat Draft
- o SNTP as a Multicast Heartbeat
- - provide operational visibility for large auditoria on a dialup
- network
- - end users can subscribe to a stream
- o will not resolve
- - whether a particular dialup link is capable of multicast
- - deciding if a dialup line has connectivity tot eh mbone
- - solve this problem on the mbone, targetting a scoped environment
- o constraints
- - must work with IGMPv1
- - join latencies have a high variation
- - membership state between application and stack may be out of sync
- - must not reqire configuration by end user
- o how it works
- - establish heartbeat which provides end-to-end control from media
- server to end client
- - quick convergence by having dialup servers, last hop before users,
- subscribe to group
- - put an SNTP packet into the message so you can use existing code,
- sequence numbers, rough time estimate
- o inplementation
- - client listner, continuous or only at startup
- - SNTP server, standard v3 with multicast capability
- - multicast devices
- o what they have done
- - ascend max 4000
- . multicast address = G
- . source address S, mask = M
- . slot time = T
- . shift register length = N
- . required messages ove N slots = K
- . no authentication yet
- . if less than K messages in last N slots, SNMP trap generated
- . trap contains sysUpTome, G, T, N, K
- o trap backs off until it is down to 1/hr
- o benefits
- - a NOC gets a realtime picture
- - clients can decide to go uni or multi-cast
- - customer support has an extremely easy tool to debug problems while
- on phone
- o much discussion of necessity, benefits, join latency, ...
- o much discussion of why this presentation, BCP? protocol spec?
- o envisaged as a very short term solution. though it points out the value
- of being able to have an API which detects IGMP membership
- o they want to submit it as BCP
- o for a host which wonders, why not just send a multicast ping?
-
- RPSL Tunnels Draft
- o see RPS minutes (get from Sue Hares, who did it in detail)
- o there were actually good suggestions/corrections by folk who actually
- understood the semantics of multi-cast tunnels
-
- Discussion of
- o much discussion of benefits and problems of default rate limit
- o 3.9 will not have the default rate limit, but it will be required to
- specify something
- o MCI, BBN, ... do not rate limit
- o we can not include mtrace to add more info about routers, info is not
- necessarily known
- o should be a BCP making clear there is no global rate limit
-
- 12/10 (Scribe: Bill Fenner)
-
- Dynamic Address Allocation
-
- - Van suggests adding *.255/16 as the local
- scope range.
-
-
- - "No Rate Limiting" BCP will be written by
- Doug Junkins (NWnet).
-
- Agenda
- Topology Database
-
- Data sources?
-
- Van: mtrace listeners, but clients need to
- specify that response must be multicast
- back. Need a document describing this.
-
-
- Dave Thaler:
-
- Database would be useful for
-
- (i). Tracking loss over tim
- (ii). Generating network design
- (iii). Simulations (ave node degree,
- etc).
-
- Elizabeth Gentile
-
- Spoke on her draft.
-
- Math Crawford will be co-author.
-
-
-
-