Article Overview
You can view the domain ID of a Fibre Channel switch using the show fcdomain domain-list vsan <vsan-id> command on Cisco MDS switches.
Understanding Domain IDs
A domain ID uniquely identifies a switch within a Fibre Channel fabric or VSAN. Each switch can have different domain IDs in different VSANs, and the domain ID is part of the overall FC ID used for addressing devices in the fabric . Domain IDs can be static (requested by the switch) or preferred (assigned by the principal switch), and they range from 1 to 239. If no domain ID is configured, the switch may use a random ID .
Viewing Domain IDs on Cisco MDS Switches
To check the domain IDs currently in use:
- Log in to the switch via console, SSH, or Telnet.
- Enter the command:
CodeCopyshow fcdomain domain-list vsan <vsan-id>
This command displays all domain IDs in the specified VSAN, including the local switch and the principal switch . Example output:
CodeCopyswitch1# show fcdomain domain-list vsan 2Number of domains: 2Domain ID WWN 0x4a (74) 20:01:00:05:30:00:13:9f 0x4b (75) 20:01:00:05:30:00:13:9e
- Local indicates the domain ID assigned to the switch you are logged into.
- Principal indicates the domain ID assigned by the principal switch in the fabric .
Checking for Conflicts
If two switches have overlapping domain IDs, one switch may become isolated. You can resolve conflicts by reassigning a domain ID using:
CodeCopyfcdomain domain <domain-id> [static | preferred] vsan <vsan-id>
- static: Requests a specific domain ID; if unavailable, the switch isolates itself.
- preferred: Requests a domain ID but accepts another if unavailable . After changing domain IDs, you may need to restart the Domain Manager:
CodeCopyfcdomain restart disruptive vsan <vsan-id>
Additional Notes
- Domain IDs are configured per VSAN, so a switch may have multiple domain IDs if it participates in multiple VSANs .
- Always save the running configuration after changes to ensure persistence across reboots .
- On Broadcom or other vendor switches, the process is similar: log in, check the current domain ID, and modify if necessary . By following these steps, you can reliably view and manage the domain ID of your fibre optic switch, ensuring proper fabric operation and avoiding conflicts.
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