From: Craig Dorry (chdorry@yahoo.com)
Date: Mon Dec 15 2003 - 09:20:04 GMT-3
Yes, the problem is that you are hitting RPs. Look at
the source and distribution trees. The server is
sending multicast traffic and R1 will register with
the closest anycast IP (Core 1 RP). So you should
have a source tree from Core 1 back to the server.
The client will register with Core 2 RP (due to R3 to
Core 1 being down). This will result in the root of
your source tree and the root of your distribution
tree being in different locations.
A way to fix this would be to implement MSDP between
Core 1 and Core 2. This would cause Core 1 to
advertise the multicast source (server) to Core 2
which would result in Core 2 joining the source tree
(ie building S,G state over to core 1) connecting your
source and distribution trees.
Config example would be:
ip msdp peer <loopback IP of remote device>
connect-source Loopback0
ip msdp cache-sa-state (This is on by default in
some newer codes)
ip msdp originator-id Loopback0 (Specifies source
of MSDP packets).
Hope this helps.
Craig
--- zzk <ccie_99@yahoo.com> wrote:
> server
> |
> R1---------------------R2
> | |
> | |
> Core 1 (RP)-----------Core 2(RP)
> | |
> | |
> R3---------------------R4
> | |
> | |
> SW1---------------------
> |
> |
> client
>
> The network is designed using Anycast RP setup for
> fast failover time.
> The network works fine during normal operation.
> However when two links are down, i.e. link between
> Core1 to R3 and link between
> R2 and Core2. The multicast traffic stops.
>
> server
> |
> R1---------------------R2
> |
> |
> Core 1 (RP)-----------Core 2(RP)
> |
> |
> R3---------------------R4
> | |
> | |
> SW1---------------------
> |
> |
> client
>
> The show ip igmp group and show ip mroute still show
> the correct entries. Because of anycast RP, both
> Core
> 1 and Core 2 are active RP in the network, will this
> cause this type of problem?
>
> thanks
>
>
>
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This archive was generated by hypermail 2.1.4 : Sat Jan 03 2004 - 08:25:41 GMT-3