From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Fri Mar 02 2007 - 20:32:15 ART
Multicast uses a split-horizon like behavior which prevents an
interface in the incoming interface list to also be in the outgoing
interface list. For groups running in PIM sparse mode this can be
overcome by running PIM in NBMA mode. If the group is dense then the
only fix it to separate the spokes onto different logical subinterfaces
or to tunnel the multicast traffic over GRE or IPIP tunnels.
HTH,
Brian McGahan, CCIE #8593 (R&S/SP)
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
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-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Todd, Douglas M.
Sent: Friday, March 02, 2007 4:10 PM
To: ccielab@groupstudy.com
Subject: Multicast on a Multipoint frame connection:
Hey All:
I am hoping to pick someone's brain.
I have a basic frame hub and spoke network
The underscore represents the same logical interface (multipoint vs
p-t-p)
R4----R1__
| \ \
| \ \
R1 R2 R3
I have a join-group on R3 so I can ping it from all other routers. What
I am
trying to accomplish is a task where
I must have an RP for defined groups but also support groups which are
not
governed by the RP.
1) I believe that I need to have sparse-dense to cover the RP
announsements and
group mappings (BSR/AutoRP) and dense for those not supported by the RP.
2) I can't use nmba mode for PIM because of the sparse-dense and I can
not just
use sparse-mode because of the restrictions of Autorp
3) I am trying to do this with out statically defining my RPs because I
know
that will work and use AutoRP.
What works because they are different logical interfaces:
R4 -> R3
R1 -> R3
What does not work: R2->R3
Seems that the multipoint keeps getting pruned which makes sense because
there
is no group on R2. How do I get around this problem?
Thanks.
DMT
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