[Xorp-users] Endless PIMv2 Register messages

[Jeff Mitchell]

Hello,

I've been using the address 234.5.6.7 to send a multicast video stream 
for a long time.

The other day I wanted to send a second video stream, and used the 
address 225.6.7.8. However, when I use this address, the 
directly-connected XORP router to the sending host starts sending 
endless numbers of PIMv2 Register messages do a downstream neighbor:

11:27:06.562760 IP 192.168.20.1 > 192.168.20.2: PIMv2, Register, length: 
1352
11:27:06.565949 IP 192.168.20.1 > 192.168.20.2: PIMv2, Register, length: 
1352
11:27:06.569345 IP 192.168.20.1 > 192.168.20.2: PIMv2, Register, length: 
1352
11:27:06.572563 IP 192.168.20.1 > 192.168.20.2: PIMv2, Register, length: 
1352
11:27:06.575814 IP 192.168.20.1 > 192.168.20.2: PIMv2, Register, length: 
1352
11:27:06.579119 IP 192.168.20.1 > 192.168.20.2: PIMv2, Register, length: 
1352
11:27:06.582372 IP 192.168.20.1 > 192.168.20.2: PIMv2, Register, length: 
1352
11:27:06.585665 IP 192.168.20.1 > 192.168.20.2: PIMv2, Register, length: 
1352
11:27:06.589024 IP 192.168.20.1 > 192.168.20.2: PIMv2, Register, length: 
1352

Oddly, the video *does* actually work if I subscibe with a client a few 
hops away -- in tcpdump I end up with these register messages 
interspersed with the video packets (in fact they seem 1:1).

Any idea what's going on?

Thanks,
Jeff