Re: PIM BIDIR

Where is the irony ?
Networks are graphs, and when you need a cycle free set of arcs (links)
that connect all the nodes (routers/switches) you are looking for
a spanning tree. It's all already defined in mathematics, and we
are reusing already defined terms :) (thanks God we did not reinvent
the wheel once !!!)

Dijkstra was never thinking of cisco when he did SPF algo either.

-Carlos

Joe Astorino @ 25/01/2010 21:09 -0300 dixit:
> It will forward up to the RP via the DF interface. Ironically I sort
> of think about it like spanning-tree too. The DF is sort of like your
> designated port -- It is the best path up to the RP. So the multicast
> starts sending and hits a router, and goes UP the multicast tree
> (hence the bi-dir term) towards the RP via the DF interface. Once the
> RP gets the information it will be sent DOWN the shared tree to
> receivers.
>
> On Mon, Jan 25, 2010 at 3:55 PM, David Prall <dcp_at_dcptech.com> wrote:
>> Based on what interface the multicast packet was received on. The RP sets
>> the root of the tree and that is all in BiDir. I like to think of BiDir as
>> Spanning-Tree for IP Multicast, with the RP being the root.
>>
>> --
>> http://dcp.dcptech.com
>>
>>
>>> -----Original Message-----
>>> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
>>> Hans None
>>> Sent: Monday, January 25, 2010 3:47 PM
>>> To: ccielab_at_groupstudy.com
>>> Subject: PIM BIDIR
>>>
>>> All,
>>>
>>>
>>>
>>> When a non RP router received a mcast packet, where should the router
>>> forward
>>> the packet? Toward the RP or toward the mcast group OIL?
>>>
>>>
>>> My question is, how will a non RP router pin point its own position?
>>> Whether
>>> it was in the path from the source to RP or from RP to the destination
>>> group?
>>>
>>>
>>>
>>> Thanks,
>>>
>>>
>>>
>>>
>>>
>>> Hans
>>>
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>>
>>
>>
>>
>>
>>
>>
>
>
>

-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net