From: gladston@br.ibm.com
Date: Thu Jun 30 2005 - 18:22:25 GMT-3
source-------R2--tunnel---R3-------receiverA
\ /
\ /
\ /
\ /
R5
\
\
receiverB
R5 is the hub, connected via serial 0 to R2 and R3.
Tunnel between R2 and R3 solves the problem of R3 receiving multicast from source (it would not receive via R5)
When a receiver joines R5, it send a join via s0. R2 and R3 receives it. R5 can not prune one of
the routers (R3 or R2), because it is a common serial (s0), and both routers would receive the prune.
So, R5 receives duplicate packets.
Would you have a solution for duplicate packets on R5?
For me it seems to be a limitation and it would be required a topology change.
Rack2R2#sh ip mroute 239.2.2.2
(148.5.46.1, 239.2.2.2), 00:11:53/00:02:56, flags: T
Incoming interface: Ethernet0/0, RPF nbr 148.5.26.6, Mroute
Outgoing interface list:
Tunnel23, Forward/Sparse-Dense, 00:10:06/00:00:00
Serial0/0.235, Forward/Sparse-Dense, 00:07:39/00:00:00
Rack2R3#sh ip mroute 239.2.2.2
(148.5.46.1, 239.2.2.2), 00:09:36/00:02:50, flags: T
Incoming interface: Tunnel23, RPF nbr 148.5.2.1, Mroute
Outgoing interface list:
Ethernet0/0, Forward/Sparse-Dense, 00:09:37/00:00:00
Serial1/0.235, Forward/Sparse-Dense, 00:09:37/00:00:00
This archive was generated by hypermail 2.1.4 : Wed Jul 06 2005 - 14:43:46 GMT-3