From: Padhu (LFG) (padhu@xxxxxxxxxxxx)
Date: Mon Jan 22 2001 - 15:47:41 GMT-3
Lucky Guess ...But thats what i thought was the problem ...I actually tried
swapping the IP lower / higher on both R1 and R2 ..still no luck ... I tried
looking up info on the book by Beau Williams also..... any multicast gurus
here who can shed some light on this ?
I also tried making R1 the DR ....changing version types etc etc ...not many
options under ip pim and under ip multicast ..so i am missing something
conceptually for sure ...
Cheers,Padhu
-----Original Message-----
From: Bays John [mailto:bays_john@bah.com]
Sent: Monday, January 22, 2001 12:37 PM
To: Padhu (LFG)
Cc: ccielab@groupstudy.com
Subject: Re: ping a multicast address question
Sorry if I don't answer your question, but there is very little information
to
work on; I'll just post the theory I have:
>From RFC 2236, IGMP Version 2 (And yes, I do read the RFC's... I think
everyone should!)
"All multicast routers start up as a Querier on each attached network. If a
multicast router hears a Query message from a router with a lower IP
address,
it MUST become a Non-Querier on that network."
In english, it means, on a broadcast medium (ethernet), only one router
should
respond to join and leave requests (and be responsible for membership), this
is the one with the lower IP address on the segment.
I would hazard a guess tht your R2's ethernet address is lower than R1's
ethernet address.
John
"Padhu (LFG)" wrote:
> I tried a similar setup over the weeekend ...I have R1 and R2 on ethernet
> with R1 as the hub
> and have r3 and r4 as spokes all joining 225.5.5.5 in sparse dense on all
> router's ethernet ...when i ping from the spokes i always get ping
response
> ONLY from R2's ethernet ..If i shut R2's ethernet then R1's ethernet
> responds ....any Ideas ? Why is that R1 doesn;t respond but the next nop
> farther away from it responds ..
>
> Cheers,Padhu
>
>
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:27:39 GMT-3