From: David Prall (dcp@dcptech.com)
Date: Fri Mar 23 2007 - 22:58:18 ART
Try adding an IGMP Queurier. It use to be that IGMP Snooping had to be
enabled. For IGMP Snoopint you have to have an IGMP router, which will be
enabled by configuring PIM. You can disable IGMP Snooping, but IGMP Querier
allows you to leave it enabled.
http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note0918
6a008059a9df.shtml
-- http://dcp.dcptech.com> -----Original Message----- > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On > Behalf Of Peyton Schouest > Sent: Friday, March 23, 2007 4:14 AM > To: ccieben@cox.net > Cc: ccielab@groupstudy.com > Subject: Re: multicast. > > 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 > >> > >>_________________________________________________________________ > >>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 > >> > > > > _________________________________________________________________ > Its tax season, make sure to follow these few simple tips > http://articles.moneycentral.msn.com/Taxes/PreparationTips/Pre > parationTips.aspx?icid=HMMartagline > > ______________________________________________________________ > _________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Sun Apr 01 2007 - 06:35:52 ART