From: Digital Yemeni (digital.yemeni@gmail.com)
Date: Thu Mar 22 2007 - 20:39:35 ART
I guess that's why we use the cross-over cable for the heart beat when they
communicate via multicast! Yes the switches do convert multicast to
broadcast unless "igmp snooping" is configured and that will enable the
switch to learn the correct ports from a router.
On 3/23/07, Peyton Schouest <pschouest@hotmail.com> 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
>
> _________________________________________________________________
> Watch free concerts with Pink, Rod Stewart, Oasis and more. Visit MSN
> Presents today.
>
> http://music.msn.com/presents?icid=ncmsnpresentstagline&ocid=T002MSN03A07001
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
-- Best Regards! Digital, CCIE# to be assigned by Cisco when it collects enough $$ out of me! :p
This archive was generated by hypermail 2.1.4 : Sun Apr 01 2007 - 06:35:52 ART