From: Scott Morris (swm@emanon.com)
Date: Sun Jul 02 2006 - 00:00:56 ART
Can't hurt! And saves a few brain cells along the way as well!
Scott
-----Original Message-----
From: Mike O [mailto:mikeeo@email.msn.com]
Sent: Saturday, July 01, 2006 10:03 PM
To: swm@emanon.com; 'Bob Sinclair'; ccielab@groupstudy.com
Subject: Re: ip pim nbma-mode when to and when not to use it???
Ok I see..I did have a multi-point FR interface with broadcast. I was able
to ping the group address from the other side of the network. So as long as
it doesn't say not to use ip pim nbma-mode , use it?
----- Original Message -----
From: "Scott Morris" <swm@emanon.com>
To: "'Mike O'" <mikeeo@email.msn.com>; "'Bob Sinclair'"
<bobsinclair@frontiernet.net>; <ccielab@groupstudy.com>
Sent: Saturday, July 01, 2006 9:51 PM
Subject: RE: ip pim nbma-mode when to and when not to use it???
> PIM NBMA mode has two features.
>
> One is to handle the queue processing (not lumping IP multicast with
> routing
> protocols in terms of choking outbound broadcast queue on a serial link).
>
> The other is to "pay more attention" to individual join/leave requests
> from
> spokes. Normal mode of operation on a multipoint interface (take ethernet
> as an example) is to assume that if one endpoint hears something (someone
> joining or leaving) that everyone else does too. This isn't the case in
> multipoint frame relay. So for sparse mode operations some extra
> attention
> needed to be brought to the proper handling of joins, leaves and in/out
> interface lists for multicast groups.
>
> Can you live without it? In many instances yes, but you'll find it much
> more helpful if you have enabled it!
>
> The broadcast keyword on a frame map lets the router know whether the
> endpoint can even do group-addressing (multicast/broadcast). So if you
> only
> have one broadcast-enabled PVC on a multipoint interface you likely would
> see little gain in using the command. It can't hurt though! And remember
> that over-configuration (as long as you aren't violating some other rule)
> is
> not counted against.
>
> Check out:
>
http://www.cisco.com/en/US/tech/tk828/technologies_white_paper09186a00800d6b
> 61.shtml
>
> HTH,
>
>
> Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE
> #153, CISSP, et al.
> CCSI/JNCI
> IPExpert CCIE Program Manager
> IPExpert Sr. Technical Instructor
> smorris@ipexpert.com
> http://www.ipexpert.com
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Mike
> O
> Sent: Saturday, July 01, 2006 9:41 PM
> To: Bob Sinclair; ccielab@groupstudy.com
> Subject: Re: ip pim nbma-mode when to and when not to use it???
>
> Bob,
>
> So if I have a situation where I'm running sparse-mode and I need to go
> across a frame-relay cloud then I need to enable ip pim nbma-mode? I
> thought
> if you had p-t-p interfaces or DLCI's mapped with the broadcast keyword
> you
> didn't need it.
> ----- Original Message -----
> From: "Bob Sinclair" <bobsinclair@frontiernet.net>
> To: "Mike O" <mikeeo@email.msn.com>; <ccielab@groupstudy.com>
> Sent: Saturday, July 01, 2006 9:25 PM
> Subject: Re: ip pim nbma-mode when to and when not to use it???
>
>
>> Mike,
>>
>> If using Sparse Mode, PIM NBMA-Mode can be used to solve Outgoing
>> Interface List problems on multi-point interfaces. It allows the
>> source to be on one spoke and a receiver on another. It also permits
>> the BSR to be on a spoke.
>>
>> What exactly do you mean when you say that "the could is broadcast"?
>> OSPF Network type? It will not make any difference, AFAIK.
>>
>> Were you able to get multicast traffic from the source to all clients
>> without using NBMA mode?
>>
>>
>> Bob Sinclair
>> CCIE #10427, CCSI 30427
>> www.netmasterclass.net
>>
>> ----- Original Message -----
>> From: Mike O
>> To: ccielab@groupstudy.com
>> Sent: Saturday, July 01, 2006 7:50 PM
>> Subject: ip pim nbma-mode when to and when not to use it???
>>
>>
>> I just completed a vendor lab and thinking I had ace'd the multicast
>> section. I missed the ip pim nbma-mode command on the frame-relay
>> interfaces.
>>
>> Now the Frame cloud was broadcast. It's my understanding that if the
>> cloud
>> is broadcast then ip pim nbma-mode is not needed.
>>
>> The multicast setup up was PIM v2 BSR sparse-mode. Would that make a
>> difference?
>>
>> -Mike
>>
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