Re: Please don't use 11.1-MFIB with DVMRP-mode tunnels

[David Meyer <]

	Bill,
	
>>  Please don't use the 11.1-MFIB branch with DVMRP-mode tunnels.
>> There is a bug (which Cisco knows about and is working on) which
>> can cause DVMRP-mode tunnels to black hole all traffic flowing
>> through them.

	The basic problem is that when a downstream neighbor poisoned 
	the cisco, the tunnel didn't get put into the OLIST for the 
	(for that (S,G)). On inspection, it turns out that this
	occurs only when ip dvmrp unicast-routing is configured on
	a dvmrp tunnel. Turning off 'dvmrp unicast-routing' on the
	tunnel solves this problem. We'll harden this up (i.e.,
	check for 'ip dvmrp unicast-routing' on a dvmrp tunnel)
	so that this doesn't occur again.

	Dave