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11-20
Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x
OL-9285-05
Chapter 11 Troubleshooting VSANs, Domains, and FSPF
Domain Issues
Step 2 Use the show fcdomain domain-list vsan vsan-id command to view which domains are currently in
your fabric.
switch1# show fcdomain domain-list vsan 2
Number of domains: 2
Domain ID WWN
--------- -----------------------
0x4a(74) 20:01:00:05:30:00:13:9f [Local]
0x4b(75) 20:01:00:05:30:00:13:9e [Principal]
--------- -----------------------
Step 3 Repeat Step 2 on the other switch to determine which domain IDs overlap.
switch2# show fcdomain domain-list vsan 2
Number of domains: 1
Domain ID WWN
--------- -----------------------
0x4b(75) 20:01:00:05:30:00:13:9e [Local][Principal]
--------- -----------------------
In this example, switch 2 is isolated because of a domain ID 75 overlap.
Step 4 Use the fcdomain domain domain-id [static | preferred] vsan vsan-id command to change the domain
ID for one of the overlapping domain IDs.
• The static option tells the switch to request that particular domain ID. If it does not get that particular
address, it will isolate itself from the fabric.
• The preferred option has the switch request a specified domain ID. If that ID is unavailable, it will
accept another ID.
Step 5 Use the fcdomain restart disruptive vsan command to restart the Domain Manager.
Note While the static option can be applied to runtime after a disruptive or nondisruptive restart, the
preferred option is applied to runtime only after a disruptive restart.
Using Fabric Reconfiguration for Domain ID Assignments
You can use a fabric reconfiguration to reassign domain IDs and resolve any overlapping domain IDs. If
you enable the auto-reconfigure option on both switches before connecting the fabric, a disruptive
reconfiguration (RCF) occurs. The RCF functionality would automatically force a new principal switch
selection and cause new domain IDs to be assigned to the different switches.
Caution A disruptive reconfiguration might affect data traffic.
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