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Troubleshooting Switched Ethernet Connectivity Verify Physical Layer Connectivity
OmniSwitch Troubleshooting Guide September 2005 page 2-3
Verify Physical Layer Connectivity
Verify that there is valid link light along the entire data path between the devices that can not switch to
each other. Make sure to include all interswitch links. Verify LED’s on all involved CMMs and NIs are
Solid OK1, Blinking OK2. If this is not the case, contact technical support.
Use the show interfaces command to verify operational status is Up, speed and duplex are correct and
match the other side of the connection. Run this command on the same interface multiple times to verify
errors (Error Frames, CRC Error Frames, Alignment Errors) are not incrementing. If the error counts are
incrementing verify the health of the cabling as well as the NIC involved. Also note that if the Collision
Frames is incrementing, this is normal for a half duplex connection. If the port is set to full duplex and
these errors are still incrementing, verify the duplex setting on the other side of the connection. Finally, if
these commands were run while the end stations were trying to ping each other, verify Bytes Received is
incrementing. If is not, verify the NIC card.
Note. Remember to do this for each port along the data path, not just the ports that directly attached to the
end stations.
-> show interfaces 5/1
Slot/Port 5/1 :
Operational Status : up,
Type : Fast Ethernet,
MAC address : 00:d0:95:7a:63:87,
BandWidth (Megabits) : 100, Duplex : Full,
Long Accept : Enable, Runt Accept : Disable,
Long Frame Size(Bytes) : 1553, Runt Size(Bytes) : 64
Input :
Bytes Received : 14397,
Lost Frames : 0,
Unicast Frames : 6,
Broadcast Frames : 93,
Multicast Frames : 7,
UnderSize Frames : 0,
OverSize Frames : 0,
Collision Frames : 0,
Error Frames : 0,
CRC Error Frames : 0,
Alignments Error : 0
Output :
Bytes transmitted : 83244,
Lost Frames : 0,
Unicast Frames : 10,
Broadcast Frames : 84,
Multicast Frames : 1106,
UnderSize Frames : 0,
OverSize Frames : 0,
Collision Frames : 0,
Error Frames : 0
If the port reports operational status down, verify the physical link, but also verify the necessary NIs and
CMM are receiving power and are up and operational. Use the show ni command followed by the slot
number and the show cmm command to verify this.