From: Ben (ccieben@cox.net)
Date: Thu Mar 22 2007 - 23:22:42 ART
Hi Peyton,
My employer has a fair amount of servers that have Multicast heartbeats
- VMWare ESX, Novell Clusters etc... all running on Native IOS Cat6513's
with no Multicast routing or other special considerations taken.
Have you actually seen any problems occur with your setup or is this all
hear-say and conjecture by the sysadmin?
Ben
Peyton Schouest wrote:
> 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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