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Verify Source Learning Troubleshooting Switched Ethernet Connectivity
page 2-6 OmniSwitch Troubleshooting Guide September 2005
To further verify the ports are in the correct VLAN and that they are in spanning tree forwarding instead of
blocking use the show vlan port command. Also note that the port type must match what it is connecting
to. If the port is 802.1Q tagged enabled for the required vlan, then the device it attaches to must also be Q
tagged enabled for that vlan. Remember to run this command on all ports in the data path.
-> show vlan 7 port
port type status
--------+---------+--------------
5/1 default forwarding
5/2 default forwarding
5/9 qtagged inactive
If ports that should be in forwarding are in blocking, or vice versa, please consult Chapter 4, “Trouble-
shooting Spanning Tree.”
Verify Source Learning
If the configuration looks correct, source learning should be examined. If connectivity exists but is slow,
or intermittent source learning could be the root cause, since data packets would be flooded. However, if
there is no packet throughput between the devices the problem is likely not due to a source learning prob-
lem.
To verify that the MAC addresses are being learned correctly use the show mac-address-table slot
command. Verify that the correct mac address is being learned of the correct port, in the correct vlan.
-> show mac-address-table slot 5
Legend: Mac Address: * = address not valid
Vlan Mac Address Type Protocol Operation Interface
------+-------------------+--------------+-----------+------------+-----------
7 00:00:39:73:13:0e learned 10800 bridging 5/1
7 00:b0:d0:75:f1:97 learned 10800 bridging 5/2
Total number of Valid MAC addresses above = 2