From: gladston@br.ibm.com
Date: Wed May 11 2005 - 13:35:13 GMT-3
R5 ip mroute table was showing that traffic to 239.8.8.8 was sent to ser0/0
But R1 did not receive the traffic.
On the way of troubleshooting it, I disabled ip mroute cache on R5's serial 0/0; after this cause R1 started to receive multicast packets. It seems that although R5 showed it was sending the multicast, it was not, and begin to do that after disabling cache.
But this behavior is strange, even more considering I reloaded all routers before disabling mroute cache to see if the problem disappears.
Have you seen this behavior?
IOS is c2600-j1s3-mz.122-15.T5.bin
Before disabling cache:
Rack2R5#sh ip mroute 239.8.8.8
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
L - Local, P - Pruned, R - RP-bit set, F - Register flag,
T - SPT-bit set, J - Join SPT, M - MSDP created entry,
X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
U - URD, I - Received Source Specific Host Report, Z - Multicast Tunnel
Y - Joined MDT-data group, y - Sending to MDT-data group
Outgoing interface flags: H - Hardware switched
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 239.8.8.8), 00:05:00/stopped, RP 0.0.0.0, flags: D
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Tunnel512, Forward/Sparse-Dense, 00:05:00/00:00:00
Serial0/0, Forward/Sparse-Dense, 00:05:00/00:00:00
(150.100.10.9, 239.8.8.8), 00:05:00/00:02:51, flags: T
Incoming interface: Tunnel512, RPF nbr 150.100.10.9, Mroute
Outgoing interface list:
Serial0/0, Forward/Sparse-Dense, 00:05:00/00:00:00
Rack2R1#sh ip mroute 239.8.8.8
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
L - Local, P - Pruned, R - RP-bit set, F - Register flag,
T - SPT-bit set, J - Join SPT, M - MSDP created entry,
X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
U - URD, I - Received Source Specific Host Report, Z - Multicast Tunnel
Y - Joined MDT-data group, y - Sending to MDT-data group
Outgoing interface flags: H - Hardware switched
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 239.8.8.8), 00:09:52/stopped, RP 0.0.0.0, flags: D
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Serial0/0.14, Forward/Sparse-Dense, 00:09:52/00:00:00
Serial0/0.125, Forward/Sparse-Dense, 00:09:52/00:00:00
Rack2R1#debug ip mpacket
(mpacket on R1 is disabled since the beginning)
After disabling mroute cache on R5:
Rack2R5#deb ip mpa
IP multicast packets debugging is on
Rack2R5#
Rack2R5#c
Enter configuration commands, one per line. End with CNTL/Z.
Rack2R5(config)#int ser 0/0
Rack2R5(config-if)#no ip mrou
Rack2R5(config-if)#no ip mroute-cache
Rack2R5(config-if)#^Z
Rack2R5#
*Mar 1 01:08:02.019: IP(0): s=150.100.10.9 (Tunnel512) d=239.8.8.8 (Serial0/0) id=206, prot=1, len=100(100), mforward
Rack2R5#
Rack2R5#
Rack2R5#
*Mar 1 01:08:02.316: %SYS-5-CONFIG_I: Configured from console by console
Rack2R5#
*Mar 1 01:08:04.022: IP(0): s=150.100.10.9 (Tunnel512) d=239.8.8.8 (Serial0/0) id=207, prot=1, len=100(100), mforward
Rack2R5#
*Mar 1 01:08:06.022: IP(0): s=150.100.10.9 (Tunnel512) d=239.8.8.8 (Serial0/0) id=208, prot=1, len=100(100), mforward
Rack2R5#
*Mar 1 01:08:08.021: IP(0): s=150.100.10.9 (Tunnel512) d=239.8.8.8 (Serial0/0) id=209, prot=1, len=100(100), mforward
Rack2R1#
*Mar 1 01:09:55.681: IP(0): s=150.100.10.9 (Serial0/0.125) d=239.8.8.8 (Serial0/0.14) id=206, prot=1, len=100(100), mforward
Rack2R1#
*Mar 1 01:09:57.677: IP(0): s=150.100.10.9 (Serial0/0.125) d=239.8.8.8 (Serial0/0.14) id=207, prot=1, len=100(100), mforward
Rack2R1#
*Mar 1 01:09:59.676: IP(0): s=150.100.10.9 (Serial0/0.125) d=239.8.8.8 (Serial0/0.14) id=208, prot=1, len=100(100), mforward
Rack2R1#
*Mar 1 01:10:01.679: IP(0): s=150.100.10.9 (Serial0/0.125) d=239.8.8.8 (Serial0/0.14) id=209, prot=1, len=100(100), mforward
Rack2R1#
*Mar 1 01:10:03.678: IP(0): s=150.100.10.9 (Serial0/0.125) d=239.8.8.8 (Serial0/0.14) id=210, prot=1, len=100(100), mforward
Rack2R1#
*Mar 1 01:10:05.678: IP(0): s=150.100.10.9 (Serial0/0.125) d=239.8.8.8 (Serial0/0.14) id=211, prot=1,
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