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Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
OL-16597-01
Chapter 1      Configuring Domain Parameters
FC IDs
To configure a different area ID for the HBA port, perform this task:
Step 1 Obtain the port WWN (Port Name field) ID of the HBA using the show flogi database command. 
switch# show flogi database 
------------------------------------------------------------------------------------------
INTERFACE VSAN FCID PORT NAME NODE NAME
------------------------------------------------------------------------------------------
vfc10/1 3 0x6f7703 50:05:08:b2:00:71:c8:c2 50:05:08:b2:00:71:c8:c0
fc2/3 3 0x6f7704 50:06:0e:80:03:29:61:0f 50:06:0e:80:03:29:61:0f
Note Both FC IDs in this setup have the same area 77 assignment.
Step 2 Shut down the HBA interface in the Cisco Nexus 5000 Series switch.
switch# configuration terminal
switch(config)# interface vfc20/1 
switch(config-if)# shutdown 
switch(config-if)# end 
switch# 
Step 3 Verify that the FC ID feature is enabled using the show fcdomain vsan command.
switch# show fcdomain vsan 1
...
Local switch configuration information:
State: Enabled
FCID persistence: Disabled
If this feature is disabled, continue with this procedure to enable the persistent FC ID.
If this feature is already enabled, skip to Step 5. 
Step 4 Enable the persistent FC ID feature in the Cisco Nexus 5000 Series switch.
switch# configuration terminal
switch(config)# fcdomain fcid persistent vsan 1
switch(config)# end
switch#
Step 5 Assign a new FC ID with a different area allocation. In this example, we replace 77 with ee.
switch# configuration terminal
switch(config)# fcdomain fcid database
switch(config-fcid-db)# vsan 3 wwn 50:05:08:b2:00:71:c8:c2 fcid 0x6fee00 area