All things related to multicast

Correct, unicast works either way.  Its the multicast traffic that breaks, 
when you are running vrrp. 

Thanks
Anand







Dan Pritts 
<>
 
07/27/2006 01:26 PM

To
"Jerry R. Cody" 
<>
cc
,
 

Subject
Re: Question on expected behavior.






Based on the way I read the original poster's question, i assume that
unicast works in this environment regardless of which switch is the
vrrp master (gets confusing when these devices are both layer 2 and 3).
If that's the case then i would hope that multicast would work too, again
regardless which switch is the master.

I would expect that in a VRRP configuration, the VRRP "master" (I don't
know the correct VRRP terminology) would also be the IGMP querier.

On Thu, Jul 27, 2006 at 01:15:04PM -0400, Jerry R. Cody wrote:
> This seems normal to me, I have some 8600 and Alteon switched firewalls 
in
> my core network using VRRP between the firewalls. In short either Switch 
A
> or B will be active via VRRP not both. In my situation I am not using 
IGMP
> and multicasting but have it setup where there are 2 firewall switches 
each
> going to the 8600 core with VRRP. The default route is the virtual IP so
> depending which switch is acting as the master A or B determines what
> switch/firewall passes the traffic. I suspect the same would be true for
> IGMP related traffic - unless I misunderstand what you are saying.
> 
> DUKE University 
> Fuqua School of Business
> IT-Infrastructure
> (919) 812-6439
> 
> 
> 
> 
> -----Original Message-----
> From: 
> 
>  
> [mailto:]
>  
> Sent: Thursday, July 27, 2006 12:42 PM
> To: 
> 
> Subject: Question on expected behavior.
> 
> Hi,
>         I have a question on what should be expected behavior for 
> PIM/IGMP.
> 
> I have a source which sits behind two switches that are running vrrp. 
> 
> Switch A IP: 10.1.1.9
> Switch B IP: 10.1.1.10
> Virtual IP:      10.1.1.11.
> 
> I also have some users that are directly connected to Switch A, and 
Switch 
> B.  For some odd reason all users that are connected to Switch A can 
> receive the stream.
> Everyone connected to Switch B cannot.  The funny thing is that if I 
> single home the same source onto switch A it works fine.  If I single 
home 
> the src to Switch B it works fine.  The only time it has issues is if 
they 
> are in this VRRP configuration.
> 
> Question: 
> Because Switch A is the IGMP designated router, does that mean Switch B 
> should stop responding to any requests for that Group? even though its 
> directly connected to that group? 
> 
> Or is this another Bug?  Both switches are Nortel 8600's.
> 
> Thanks
> Anand
> 
> 
> 
> 
> 


danno
--
dan pritts - systems administrator - internet2
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