From: Peyton Schouest (pschouest@hotmail.com)
Date: Thu Mar 22 2007 - 14:44:54 ART
I have come across a situation at work wondering if any of the more
knowledgable people out there could shed some light on this for me.
From my understanding if a switch does not know what ports a multicast
packet should go to it will broadcast it by default. The issue at work is we
have two servers that basically have a heart beat or stay alive communiction
between them and they use a multicast address. Both servers are on the same
vlan same switch. The heart beat is set for once every 10 seconds the two
servers will send out one multicast packet. This all seems pretty straight
forward except that I have a sys admin telling me it will not work because
cisco switches will only forward 3 packets and then it quits forwarding
multicast by default which I have never in my life heard of. Because of this
"feature" he states that we must enable multicast routing and pim on the
vlan interface for the servers heart beat to work. I have never heard of any
so called feature or bug before concerning a cisco switch. Has anyone dealt
with something like this before or able to stregnthen an argument from
either side? Thank you for your help before hand.
Peyton
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