From: Koen Zeilstra (koen@koenzeilstra.com)
Date: Tue May 30 2006 - 03:37:32 ART
What imho Shivjit is trying to accomplish is prevent dense mode fallback.
12.3(4)T has a nice feature for this "no ip pim dm-fallback"
regards,
Koen
-----------------------
"First things first -- but not necessarily in that order"
-- The Doctor, "Doctor Who"
On Tue, 16 May 2006, Jian Gu wrote:
| 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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