Re: PIM BIDIR

David,

Yes, that is precisely what I mean! In a PIM sparse-mode topology you
typically can have Anycast RP teamed up with MSDP to share those
sources between RPs. In PIM Bi-Dir you don't have that luxury. What
you are describing is the problem you would run into indeed.

On Tue, Jan 26, 2010 at 9:12 AM, David Prall <dcp_at_dcptech.com> wrote:
> In a network you will always have some routers that see the /32 anycast as
> ECMP. They will look to only one as the RP. Therefore the BiDir topology
> will be broken/split at these locations. Everywhere else they will have a
> single topology, split by the RP they have closest to them. Half your
> network will have one topology and the other will have another. The two
> won't meet.
>
> David
>
> --
> http://dcp.dcptech.com
>
>
>> -----Original Message-----
>> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
>> Joe Astorino
>> Sent: Tuesday, January 26, 2010 9:03 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
>>
>> 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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>> >>
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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
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>> >> >>
>> >> >>
>> >> >>
>> >> >
>> >> >
>> >> >
>> >>
>> >>
>> >>
>> >> --
>> >> 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
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>> 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