From: Peyton Schouest (pschouest@hotmail.com)
Date: Fri Mar 23 2007 - 05:14:18 ART
Ben,
Thank you for your reply. This is on a 6513 also and I have not seen the
issue but the sys admin swears that it is a well known issue with Cisco
switches. Basically he read this on the server vendors website in a forum.
Since he has already briefed this view up to leadership it is on my shop to
prove that the switch is not the actual problem. I am going to start doing
some pretty lengthy captures and investigation to prove that the problem
either resides on the switch or not. I'll let you know what I find out.
Thanks,
Peyton
>From: Ben <ccieben@cox.net>
>To: Peyton Schouest <pschouest@hotmail.com>
>CC: ccielab@groupstudy.com
>Subject: Re: multicast.
>Date: Thu, 22 Mar 2007 22:22:42 -0400
>
>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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