Re: PIM BIDIR

Thank you! OK -- Typically you can do this with something known as
Phantom RP. With phantom RP you have a few options.

1) The "phantom" RP is actually not a real router : ) Yes, I know it
sounds insane. The RP in bi-dir PIM does not have to be a specific
physical router. It can be an entity -- basically a subnet. As long
as people can get to the subnet, they can reach the "RP"

2) Phantom RP with longest match -- In this case you will assign
multiple routers the same loopback address but with different masks.
So say your RP is 1.1.1.1
   R1: 1.1.1.1/32
   R2: 1.1.1.1/30
   R3: 1.1.1.1/29

due to the longest prefix match rules, you have redundancy.

On Tue, Jan 26, 2010 at 8:46 AM, David Prall <dcp_at_dcptech.com> wrote:
> With all of the non-english speaking individuals that make up groupstudy I
> find it funny we can even think about proper English grammar.
>
> Now back to BiDir PIM. Can anyone tell me how you provide for RP redundancy
> in a BiDir environment, using static RP configuration?
>
> David
>
> --
> http://dcp.dcptech.com
>
>> -----Original Message-----
>> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
>> Scott Morris
>> Sent: Tuesday, January 26, 2010 8:02 AM
>> To: Joe Astorino
>> Cc: ron.wilkerson_at_gmail.com; Carlos G Mendioroz; David Prall; Hans
>> None; ccielab_at_groupstudy.com
>> Subject: Re: PIM BIDIR
>>
>> I find it more ironic that a list just full of wonderful grammar
>> lesson
>> candidates decides to take the time to actually worry about this one!
>> IMHO, I would not consider Joe to be one of the "big offenders".
>>
>> ;)
>>
>> Joe Astorino wrote:
>>
>> OK -- I find it "interesting" that David and I thought of the same
>> thing. Jesus Christ...
>>
>> On Tue, Jan 26, 2010 at 7:48 AM, <ron.wilkerson_at_gmail.com>
>> wrote:
>>
>> Carlos is questioning your use of the word ironic and rightfully
>> so. Very cool that gs provides grammar lessons here and there. :)
>>
>> -----Original Message-----
>> From: Joe Astorino <jastorino_at_ipexpert.com> Date: Tue, 26
>> Jan 2010 07:15:33
>> To: Carlos G Mendioroz <tron_at_huapi.ba.ar> Cc: David Prall
>> <dcp_at_dcptech.com> ; Hans None <acsyao_at_hotmail.com> ;
>> <ccielab_at_groupstudy.com> Subject: Re: PIM BIDIR
>>
>> Yep , just saying it was ironic how David and I thought of the same
>> thing.
>>
>> On Tue, Jan 26, 2010 at 7:06 AM, Carlos G Mendioroz
>> <tron_at_huapi.ba.ar> wrote:
>>
>> 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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>> _______________________________________________________________________
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>>
>> --
>> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI
>> Argentina
>>
>> --
>> Regards,
>>
>> Joe Astorino CCIE #24347 (R&S)
>> Sr. Technical Instructor - IPexpert
>> Mailto: jastorino_at_ipexpert.com Telephone: +1.810.326.1444
>> Live Assistance, Please visit: www.ipexpert.com/chat eFax:
>> +1.810.454.0130
>>
>> IPexpert is a premier provider of Classroom and Self-Study Cisco
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>>
>
>
>

-- 
Regards,
Joe Astorino CCIE #24347 (R&S)
Sr. Technical Instructor - IPexpert
Mailto: jastorino_at_ipexpert.com
Telephone: +1.810.326.1444
Live Assistance, Please visit: www.ipexpert.com/chat
eFax: +1.810.454.0130
IPexpert is a premier provider of Classroom and Self-Study Cisco CCNA
(R&S, Voice & Security), CCNP, CCVP, CCSP and CCIE (R&S, Voice,
Security & Service Provider) Certification Training with locations
throughout the United States, Europe and Australia. Be sure to check
out our online communities at www.ipexpert.com/communities and our
public website at www.ipexpert.com
Blogs and organic groups at http://www.ccie.net