From: alsontra@hotmail.com
Date: Fri Feb 06 2004 - 00:08:05 GMT-3
Although, I can't recall why or find any supporting information at the
moment. I remember reading somewhere that if your going to use pim sparse
you should use pim spare-dense mode to avoid the chicken or the egg problem.
I also recall that on NBMA interface you should use sparse mode, don't
remember why. (scary thought)
In any event, I'm using only sparse mode on NBMA interfaces and in most
possible permutations (Auto-RP, c-BSR, RP's located behind spokes) and all
configurations have worked. Also, thanks for the information regarding ip
pim DR. I thought the DR process only applied to multi-access networks. Or
At least that's what I think I read in, Cisco Press's Developing IP
Multicast Networks.
Thanks,
Alsontra
----- Original Message -----
From: "Michael Snyder" <msnyder@revolutioncomputer.com>
To: <ccielab@groupstudy.com>
Cc: "'Hossam'" <sam6626@yahoo.com>; <alsontra@hotmail.com>
Sent: Thursday, February 05, 2004 4:33 PM
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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