From: Scott Morris (swm@emanon.com)
Date: Thu Feb 05 2004 - 21:53:35 GMT-3
You also have the BSR functionality which is niether Dense nor Sparse in its
implementation.
As for the "ip pim dr-priority" the effect would be a little odd here. The
PIM DR is based on a routers' relationship to a multicast source. PIM
Sources, or the local DR will send PIM-Register messages to an RP. So I'm
thinking this command is serving a different function then what you are
trying to talk about here, because it has no bearing on a router being an RP
or forwarding RP information on!
HTH,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, CISSP,
JNCIS, et al.
IPExpert CCIE Program Manager
IPExpert Sr. Technical Instructor
swm@emanon.com/smorris@ipexpert.net
http://www.ipexpert.net
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Michael Snyder
Sent: Thursday, February 05, 2004 7:33 PM
To: ccielab@groupstudy.com
Cc: 'Hossam'; alsontra@hotmail.com
Subject: RE: Multicast over NBMA again!
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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