From: gladston@br.ibm.com
Date: Tue Nov 30 2004 - 16:39:20 GMT-3
Have you tried to implement the example SPT-Switchover of Williamson's book?
I am having a different behavior compared to the example on the book.
Source 239.11.11.11 is connected to router A. Router A is connected to RC. RP is connectedto router C.
Router D is connected to RC.
Router B is connected to router A
Router A and D joined the group 239.11.11.11
The result on the book is that router C receives the traffic through RP
because of the (S,G)RP-bit entry.
What I got is that router C receives the traffic through router A.
C#sh ip mrout 239.11.11.11
(*, 239.11.11.11), 01:15:22/00:03:03, RP 172.16.2.1, flags: S
Incoming interface: Serial0/0.12, RPF nbr 172.16.112.2
Outgoing interface list:
Serial0/0.114, Forward/Sparse-Dense, 00:23:38/00:02:41
FastEthernet0/0.17, Forward/Sparse-Dense, 00:19:14/00:03:03
(172.16.56.6, 239.11.11.11), 00:27:14/00:02:58, flags: T
Incoming interface: Serial0/0.114, RPF nbr 172.16.14.4
Outgoing interface list:
FastEthernet0/0.17, Forward/Sparse-Dense, 00:19:14/00:02:33
A#sh ip mrout 239.11.11.11
(*, 239.11.11.11), 00:31:22/00:03:01, RP 172.16.2.1, flags: SJ
Incoming interface: Serial0.141, RPF nbr 172.16.14.1
Outgoing interface list:
Serial0.43, Forward/Sparse-Dense, 00:24:17/00:03:01
(172.16.56.6, 239.11.11.11), 00:27:53/00:03:28, flags: T
Incoming interface: Ethernet0, RPF nbr 172.16.45.5
Outgoing interface list:
Serial0.43, Forward/Sparse-Dense, 00:24:17/00:02:31
Serial0.141, Forward/Sparse-Dense, 00:19:53/00:03:24
RP#sh ip mrout 239.11.11.11
(*, 239.11.11.11), 01:16:50/00:02:58, RP 172.16.2.1, flags: S
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Serial0.21, Forward/Sparse-Dense, 00:24:52/00:02:50
(172.16.56.6, 239.11.11.11), 00:28:28/00:02:42, flags: PTA
Incoming interface: Serial0.21, RPF nbr 172.16.112.1
Outgoing interface list: Null
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