Date: Tue, 23 Jun 1998 07:25:43 -0700 (PDT) From: ken lindahl <lindahl@ack.berkeley.edu> To: graeme.brown@bt-sys.bt.co.uk Cc: freebsd-net@FreeBSD.ORG Subject: RE: Looking for FreeBSD version of mrouted-3.8 (DVMRP) Message-ID: <199806231425.HAA27759@ack.berkeley.edu>
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hi, in most versions of IOS, ciscos do not maintain prune state when there are DVMRP neighbors present on a multi-access LAN. (i don't know if this description matches your instance, if not, please ignore my rantings.) i think this is related to the poison-reverse mechanism used in DVMRP to tell the upstream routers that there are downstream neighbors. ciscos don't maintain the DVMRP poison-reverse information, therefore they are not able to safely prune. (they may "cut off" downstream DVMRP neighbors that they've "forgotten" about.) so, ciscos won't prune in the presence of DVMRP neighbors on a multi-access LAN. i think i've been told that this has been fixed in 11.2(13) and later, also in 11.1CC(19) and later, though i haven't heard exactly how. i've seen the problem; i've not yet tested 11.2(13) to see if it is fixed. the one workaround that i know of is to tunnel between the cisco and the DVMRP router (mrouted or bay router, for example), making sure that the DVMRP router has disabled native (non-tunneled) multicast onto the shared LAN. ken lindahl uc berkeley On 23 Jun 1998 09:32:27, Graeme Brown <graeme.brown@bt-sys.bt.co.uk> wrote: >Greg > >thanks for info. I tried mrouted-3.8.2 on a FreeBSD box interworking to a >CISCO router running PIM-SM but could not get mrouted-3.8.2 to prune even >though >I explicitly put "pruning on" in /etc/mrouted.conf. > >Graeme To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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