From: Bob Sinclair (bob@bobsinclair.net)
Date: Thu Jul 12 2007 - 17:55:13 ART
wim.depauw@getronics.com wrote:
> Hi,
>
> I'm testing the PIM bidir and a classic sparse-dense mode with the following setup
>
> R1--------R4--------R5---Multicast source
>
> with R1 = RP ( static defined)
> R5 = has ethernet interface with an IGMP join group defined
>
>
> I checked the differences between PIM bidir and sparse-dense mode and it works like in the Cisco documentation. So far so good but what I miss in the doc what is the real advantage of using bidir mode .Less CPU/memory resources ?
>
> How can I know on the exam what they are going to ask ?
>
>
Wim,
The primary advantage of bidirectional PIM over regular sparse-mode is
the fact that you have only one tree no matter how many sources there
are for a particular group. Much less state to maintain if you have an
application that has many sources for the same group.
One lab tipoff clue for bidir would be that there is no (S,G) state
maintained anywhere.
HTH,
--Bob Sinclair CCIE 10427 CCSI 30427 www.netmasterclass.net
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