All things related to multicast

Brent,

Here is the sime topology map:  This should help.


[receiver 1] ---- [switch A]-----------[switch B]--- [receiver 2] 
                        \                     /
                          \                 / 
                            [L2 switch]
                            |
                            [Source]

The Source can be seen by receiver 1, but not by receiver 2.  Turn on VRRP 
and single home it and everything works fine.
Switch A is the one that sends the PIM register messages to the RP. Switch 
B, sees the src, and creates an entry in its mroute table.
The L2 switch is definitely sending traffic up to switch B. 

Thanks
Anand





Brent Draney 
<>
 
07/27/2006 12:50 PM

To

cc
,
 

Subject
Re: Question on expected behavior.







Have you tried bridging the 2 switches together without vrrp and
verifying that hosts on both switches will be able to join?  I
would guess that its a snooping bug with bridged switches and 
has nothing to do with vrrp which is a layer-3 thing.

Brent

> 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
> 
> 
> 
> 
>