From: jin (jin10101010@xxxxxxxxxxx)
Date: Sun Aug 25 2002 - 08:30:10 GMT-3
RE: Multicasting ! Go to the Hell!thanks.
I think i have a igp problem :-)
----- Original Message -----
From: Krucker, Louis
To: 'jin '
Sent: Sunday, August 25, 2002 7:43 PM
Subject: RE: Multicasting ! Go to the Hell!
Hi
The solution is, you cant ping a mcast group whitout a mcast server, dont ask
me why is it possible from the MA (R2).
But, if you ping the mcast group from R2, type sh ip pim rp. You should see a
rp mapping. Than go to R3 and type in the same command, if your config is ok y
ou will see an rp (r1).
You cant ping from r3, period.......you can verify whith mtrace.
hope this helps
cheers
Louis
-----Original Message-----
From: jin
To: ccielab@groupstudy.com
Sent: 25.08.2002 11:06
Subject: Multicasting ! Go to the Hell!
It's so difficult. And I can't understand.
I have read so many book. But I'm still confused.
Network is below like the one that we already have been discussed with
it during several months.
ether-r1--r2--r3-ether. All router links are F/R and 2 ethernet of r1
and r3.
R2 is not a hub router. r1-r1 and r2-r3 is different network.
Now this is the problem.
If r1 has a igmp join group like 224.100.100.100, and r1 is a Auto-RP
and MA, r2 can ping to the 224.100.100.100 but r3 can't.
I checked pim rp mapping and rpf table.
When I check the mroute table after pinging to the 224.100.100.100 on
the r3, mroute table show that ping's next hop is ethernet of r3.
And there is no outgoing interface, saying NULL. But 'sh ip pim rp
mapping' show me the next hop of the 224.100.100.100 is r1's
loopback,which is set by ip pim send-rp-announce <intf> scope.
I don't understand what's wrong.
Is there something mistaken?
Please let me know.
PS.
routing table is good. I know multicast rpf first check the igp table.
And I'm sure my igp table is almost complete.
I saw this discussion this year early. But also there was no solution.
And please let me doing basic command, like that 'do not use the ip pim
nbma with sparse-dense mode'..
If I don't know about it basically, I won't post this discussion.
Thanks Group.
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