From: Michael Snyder (msnyder@revolutioncomputer.com)
Date: Thu Feb 05 2004 - 21:33:00 GMT-3
I could be wrong, but I remember that auto-rp doesn't work without
sparse-dense mode. How could it, it uses multicast to advertise the rp
groups? Chicken and egg problem.
So, if you use sparse mode, you have to use a static rp.
Auto-rp has to have sparse-dense mode to function.
Sparse-mode will work fine with static rp.
One more thing, on the multipoint frame-relay (or even multipoint isdn)
Run ip pim nbma-mode on the interfaces
And on the hub interface run the following command,
ip pim dr-priority 1000
Why? Same reason you make the ospf process the highest priority on the
hub interface, it can speak to all the spokes.
interface Serial0.56 multipoint
ip address 172.16.56.2 255.255.255.248
ip pim dr-priority 1000
ip pim nbma-mode
ip ospf hello-interval 2
ip ospf priority 255
frame-relay map ip 172.16.56.2 105
frame-relay map ip 172.16.56.5 105 broadcast
frame-relay map ip 172.16.56.6 106 broadcast
I could be wrong on some this, your mileage may vary, but the above
config(s) have worked well for me in practice labs.
-----Original Message-----
From: alsontra@hotmail.com [mailto:alsontra@hotmail.com]
Sent: Thursday, February 05, 2004 7:49 PM
To: Hossam
Cc: ccielab@groupstudy.com
Subject: Re: Multicast over NBMA again!
Sorry about that. I was running a similar configuration yesterday, and
there
are a few things I notice right off about yours. Sparse-dense mode is
not
recommended for NBMA interfaces, I think sparse should be used. Also you
need
to issue the ip pim nbma-mode command on the serial interfaces( I used
this
command on all NBMA attached interfaces)
ip pim nbma-mode <------This allows multipule mappings on your serial
ip pim sparse-mode
After you've add those, I would verify that the RP address is
registering with
the spoke clients.
(sh ip pim rp )
Should look like this: Group: 228.1.1.1, RP: 223.1.1.2, v1, uptime
04:01:38,
expires 00:03:18
There are some exellent post regarding this topic, do a search for Brian
McGahan's last post regarding multicast.
Hope this helps,
Alsontra
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