If multicast were blocked, you wouldn't get past Init state...
X-JNPR-Received-From: outside
cc: dave_murphy_1@excite.com, juniper-nsp@puck.nether.net
Date: Thu, 31 May 2001 01:56:45 -0700
From: Stephen Stuart <stuart@mfnx.net>
> The most common cause of stuck-in-exstart is an MTU mismatch. If not,
> turn on some tracing and see what OSPF has to say about it.
IGMP snooping needs to be configured or disabled if the switch is
blocking multicast to ports from which no IGMP join messages were
detected.
Stephen
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