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Troubleshooting IP Multicast Switching (IPMS) Troubleshooting IPMS in Debug CLI
OmniSwitch Troubleshooting Guide September 2005 page 14-8
Note the output of the show ip multicast queriers command during this test:
-> show ip multicast queriers
Source IP VLAN Slot/Port Expire Type
--------------------+----+---------+------+-------
10.10.10.190 1 1/22 146 Dynamic
The .190 address is that of the uplinked OSR9 in the test.
The show ip multicast neighbors command will show the neighbors in this test network:
-> show ip multicast neighbors
Source IP VLAN Slot/Port Expire Type
--------------------+----+---------+------+-------
10.10.10.34 1 1/22 85 Dynamic
It is actually unrelated to the test, other than it being in the test network while testing was being done. It is
worthwhile to note that there is a neighbor being listed, and that it, too, was learned from port 1/22, the
uplink port to the OSR9.
The show ip multicast groups command during the test:
-> show ip multicast groups
Destination IP Source IP VLAN Slot/Port Expire
--------------------+--------------------+----+---------+------
224.0.0.9 10.10.10.220 1 1/22 157
224.0.1.22 10.10.10.54 1 1/22 210
224.0.1.24 10.10.10.222 1 1/22 210
224.77.1.0 10.10.10.51 1 1/7 156
224.77.182.214 10.10.10.51 1 1/7 162
229.55.150.208 10.10.10.222 1 1/22 210
239.255.255.254 10.10.10.5 1 1/22 210
239.255.255.254 10.10.10.222 1 1/22 85
You can match the groups to the associated IP addresses from the above debug command to verify that all
is functioning properly.
Note for the debug CLI command:
The command
-> debug ip packet show-multicast on board ni 1 output console
will only set the options for debug. In order to actually see the output, you must enter:
-> debug ip packet start
And to stop the output:
-> debug ip packet stop
Another tip is to enter the full debug ip packet command, then enter debug ip packet stop, to which you
will get a response “...already stopped,” and then enter debug ip packet start. That way, in order to stop the
display, you can simply up-arrow twice and hit enter to stop the display, which will likely be scrolling by
quickly enough so that you cannot see what you are entering!