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8-10
Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x
OL-9285-05
Chapter 8 Troubleshooting Ports
Overview of the FC-MAC Driver and the Port Manager
Step 4 If both ports are online, select the FLOGI tab to verify that the Fibre Channel ports for the host and
storage have performed a fabric login (FLOGI) and are communicating with their respective switches.
Step 5 Choose FC > Name Server to verify that the assigned FC ID during FLOGI exists in the name server
database.
At this point the HBA and subsystem ports have successfully established link level connectivity and each
one can communicate with its locally attached switch in the fabric. The next step is to verify zone
membership. For a more detailed discussion and description of VSANs and zones see Chapter 14,
“Troubleshooting Zones and Zone Sets.”
Troubleshooting Port States from the CLI
To display complete information for an interface, use the show interface command. In addition to the
state of the port, this command displays:
• Port WWN
• Speed
• Trunk VSAN status
• Transmit and receive buffer-to-buffer credits configured and remaining
• Maximum receive buffer size
• Number of frames sent and received
• Transmission errors, including discards, errors, CRCs, and invalid frames
Example 8-1 displays the show interface command output.
Example 8-1 show interface Command Output
switch# show interface fc1/3
fc1/3 is trunking
Hardware is Fibre Channel, SFP is short wave laser
Port WWN is 20:03:00:0b:fd:8c:f8:80
Peer port WWN is 20:10:00:0b:fd:2c:8c:00
Admin port mode is auto, trunk mode is on
Port mode is TE
Port vsan is 161
Speed is 2 Gbps
Transmit B2B Credit is 255
Receive B2B Credit is 255
Receive data field Size is 2112
Using Port Debug Commands
Use the show hardware internal debug-info interface fc CLI command to debug ports.
Note To issue commands with the internal keyword, you must have an account that is a member of the
network-admin group.
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