Re: PIM BIDIR

I'm confused. Are we playing a gameshow :P But for the records,
BiDir PIM doesn't use the concept of (S,G) groups so the sharing of
sources between RPs is sort of broken.

On Tue, Jan 26, 2010 at 8:59 AM, David Prall <dcp_at_dcptech.com> wrote:
> Joe,
> Correct response.
>
> And why does anycast break BiDir PIM?
>
> David
>
> --
> http://dcp.dcptech.com
>
>
>> -----Original Message-----
>> From: Joe Astorino [mailto:jastorino_at_ipexpert.com]
>> Sent: Tuesday, January 26, 2010 8:54 AM
>> To: David Prall
>> Cc: Scott Morris; ron.wilkerson_at_gmail.com; Carlos G Mendioroz; Hans
>> None; ccielab_at_groupstudy.com
>> Subject: 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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>> >> --
>> >> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI
>> >> Argentina
>> >>
>> >> --
>> >> Regards,
>> >>
>> >> Joe Astorino CCIE #24347 (R&S)
>> >> Sr. Technical Instructor - IPexpert
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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
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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