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Chapter 5
Troubleshooting SAN Switching Issues
S e n d d o c u m e n t c o m m e n t s t o n e x u s 5 k - d o c f e e d b a c k @ c i s c o . c o m .
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SAN Port Channels
Fibre channel port is down when trying to connect switches via SAN Port
Channel
When trying to connect switches using SAN port channel, the Fibre Channel port is down.
The show interface brief command produces
fc slot/port is down (Error disabled - Possible port channel misconfiguration)
Possible Cause
One of the SAN port channel compatibility parameters is misconfigured in the configuration.
A compatibility check ensures that the same parameter settings are used in all physical ports in the
channel. Otherwise, they cannot become part of a port channel. The compatibility check is performed
before a port is added to the port channel.
The check ensures that the following parameters and settings match at both ends of a port channel:
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Solution
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OL-25300-01
Use the show zone status command in all switches in the VSAN to verify the operation mode and
the default-zone policy.
Use the zone mode basic command to change any switches that are not in basic mode.
Use the zone default-zone command on each switch in the VSAN to set the same default zone
policy.
Capability parameters:
type of interface, Gigabit Ethernet at both ends, or Fibre Channel at both ends.
Administrative compatibility parameters:
speed, mode, rate mode, port VSAN, allowed VSAN list, and port security..
Operational parameters:
remote switch WWN and trunking mode.
Use show san-port-channel compatibility-parameters to verify which parameters need to be
checked in the configuration.
Generally, if the configuration is fixed and the FC port is shut or no shut, the port recovers normally.
If the issue persists with a different error message, debug further by running one or more of the
following commands:
show port internal info interface fc <slot/port>
show port internal event-history interface fc <slot/port>
show san-port-channel internal event-history errors
show logging log | grep fc <slot/port>
show san-port-channel internal event-history all
show tech-support detail > bootflash:showtechdet
Cisco Nexus 5000 Series Troubleshooting Guide
SAN Port Channels
5-13
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Troubleshooting
