From: Jian Gu (guxiaojian@gmail.com)
Date: Tue May 16 2006 - 20:01:02 ART
Shivjit,
I don't think you were answering what Mathew is asking.
The reason spokes can get the RP address even without auto-rp listener
configured is because the spokes are directly connected to RP. (I vaguely
remember Chris Lewis had a very good explaination about this, please search
archieve for it)
What is your point of configure static rp with an access-list to allow
auto-rp groups? firstly, static RP might not be allowed, secondly, by
default "ip pim rp-address" will include the whole multicast address space
224.0.0.0/4.
On 5/16/06, Shivjit Patil <shivjitp@yahoo.com> wrote:
>
> To configure Auto-RP in a sparse-mode env do the following
>
> 1) Configure rp address for the global groups on all the routers
> participating in multicast using the following command
> ip pim rp-address x.x.x.x 1
> access-list 1 permit 224.0.0.39
> access-list 1 permit 224.0.0.40
>
> 2) Configure the rp address for the local groups on the RP router using
> ip pim send-rep-announce lo 0 scope 16 group-list 1
> access-list 1 permit 239.0.0.0 0.255.255.255
>
> 3) Configure the rp mapping agent on another router that has good
> connectivity to all routers in the multicast domain using
> ip pim send-rp-discover scope 16
>
> All the interfaces should have "ip pim sparse-mode" configured.
>
> So the difference between sparse-mode and sparse-dense-mode is that we
> need to define the rp address for the default groups on all the routers.
>
> Also keep in mind that when you are deploying this over a frame-relay
> network on the hub router configure " ip pim nbma-mode" to allow it to
> distribute the rp mappings to all its spokes.
>
> HTH
> Shiv
>
> Mathew Fernando <mathewfer@gmail.com> wrote:
> Hi Group,
>
> I setup a LAB scenario with a hub-and-spoke topology where there are 3
> spoke
> routers and 2 of the spokes has another router behind.
> The hub router uses FR sub-interfaces for 3 spoke routers.
>
> RIP is configured on all the interfaces on all the routers and PIM SPARSE
> mode is configured on all the interfaces.
> AUTO-RP is configured on the HUB router who acts as the RP as well as the
> mapping agent. No filters are applied for the groups in RP or mapping
> agent
> configs.
>
> When I say "show ip pim rp mapping", it shows the RP IP (of the hub
> router)
> on all the spoke routers except on the 2 routers behind the spoke routers.
>
> MY QUESTION IS: I do not understand how these 3 spoke routers learn the
> AUTO-RP when there is no DENSE mode (or sparse-dense) configured.
>
> Also the command "ip pim autorp listener" is not configured on any of the
> routers. I understand why these 2 routers behind the spoke does not see
> the
> AUTO-RP (because there is no DENSE configured). IOS on all the routers are
> 12.2T.
>
> Can someone please explain how this works?
>
> Thanks in advance
>
> mathew
>
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