Because with Anycast, you run the risk of each side going to a different
"physical" RP which would confuse the crap out of everyone.
By playing with subnet masks and the inherent rule of most-specfic match,
you assure that everyone is going to the same ACTUAL RP rather than the
amorphous anycast address.
Can I have Multicast for $800 Alex? ;) (Why are we playing a game?)
Scott Morris, CCIEx4 (R&S/ISP-Dial/Security/Service Provider) #4713,
JNCIE-M #153, JNCIS-ER, CISSP, et al.
JNCI-M, JNCI-ER
evil_at_ine.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Outside US: 775-826-4344
Knowledge is power.
Power corrupts.
Study hard and be Eeeeviiiil......
David Prall 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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Sr. Technical Instructor - IPexpert
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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
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Security & Service Provider) Certification Training with locations
throughout the United States, Europe and Australia. Be sure to check
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Received on Tue Jan 26 2010 - 09:27:35 ART
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