From: Schulz, Dave (DSchulz@dpsciences.com)
Date: Thu Mar 30 2006 - 22:59:43 GMT-3
Since nbma allows the join and leave messages to be handled separately, it
allows the multicast traffic to be based on the Layer 3 (IP address), rather
than the interface, which would cause an RPF failure to the spokes. Do a
"show ip mroute" at the hub, with and without this command and you'll see the
difference. This allows the host to function as the RP and messages to be
handled separately.
Dave Schulz
Email: dschulz@dpsciences.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Petr
Lapukhov
Sent: Wednesday, March 29, 2006 3:17 AM
To: Alexei Monastyrnyi
Cc: ccielab@groupstudy.com
Subject: Re: OT: ip pim nbma-mode
Hello Alexei,
I'm curious about this topic too :)
First, for Frame-Relay interface things look clear:
R1#sh interfaces serial 0/1 | inc Broadcast
Broadcast queue 0/64, broadcasts sent/dropped 0/0, interface broadcasts 0
This queue is software and could be tuned with
"frame-relay broadcast-queue" interface statement.
Now, for all other interfaces (I mean HDLC/PPP, Ethernet).
I dont really know, if handle broadcasts in special way.
I recall pak_priority stuff, but that thing is different :)
HTH
Petr
29.03.06, Alexei Monastyrnyi <alexeim@orcsoftware.com> NAPISAL(A):
>
> Hi Folks!
>
> I know two things about the subj.
>
> 1. It is designed to treat join-leave messages separately for NBMA
> serial interfaces with PIM sparse mode.
>
> 2. It is designed to re-classify multicast packets to go via normal
> hardware queue out of serial interface. It is also said that there is a
> special "broadcast hardware queue" for serial interfaces, and multicast
> is treated as a broadcast, which might make this to be an issue for slow
> serial links.
>
> The second thing rises a kind of doubts ... I have checked available
> books and CCO and couldn't find any references regarding "broadcast
> hardware queue on serial interfaces".
>
> Would appreciate any hints here.
>
> A.
>
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