From: Jacquie Qi Zhang (qizhang@xxxxxxxxx)
Date: Mon Feb 28 2000 - 02:15:21 GMT-3
Hi,
Can someone explain to me, when I have a routerA join a multicast group
(using 'ip igmp join-group' command), what is its role? It is a source or a
receiver?
If from another routerB, I ping that group address, what is its role for
routerB? Source or receiver?
My understanding is that when a router staticly join a multicast group, then
this router is a receiver, and the router from which to ping that multicast
group address becomes a source. Or the other around?
Understanding this will help me to choose who should be the RP in sparse
mode. (RP should be the router closest to the source).
Here is my lab:
e0 e0 s0 s0
routerB---------routerC-----------routerA
Ether F.R. (join 224.0.10.10)
routerA join 224.0.10.10 on FR interface s0, ping this group address on
routerB.
I found if I use dense mode, sometimes I got 100% sucess rate, but sometimes
0%, it's either 100% or 0%, never in between. I have turned on "ip multicast
routing" on all routers on the ethernet and on the FR cloud. Then I changed
to use spars-dense-mode and configured RP. But I found if I configured
routerB's e0 to be the RP, I had the same problem as I had in dense mode; if
I configured routerC's F.R interface s0 to be the RP, then I got 100%
success rate.
So, has any one had any problem in configuring dense-mode, any advice on how
to choose RP?
Thanks,
Jacquie
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