Fiber optic switch finds port via wn

You can identify which fiber channel switch port a device is connected to by querying the switch for its WWN (World Wide Name) using show commands on Cisco MDS or similar SAN switches. Steps to Perform a WWN-Based Port Lookup1.

Access the Switch CL

I Log in to the switch using SSH or console access. Ensure you have administrative privileges to run show commands. 2.

Identify the WW

N of the Device Each SAN device has a unique WWPN (World Wide Port Name) or WWNN (World Wide Node Name). Obtain this from the host, storage array, or SAN management software. 3.

Query the Switch for WW

N Information Use the following commands on a Cisco MDS switch:show flogi database – Lists all logged-in devices with their WWPNs and the switch port they are connected to.show fcns database – Displays the mapping of WWPNs to FCIDs (Fibre Channel IDs) and associated ports.show interface brief – Provides a summary of all interfaces, including operational status, speed, and port type.show interface transceiver – Gives details about the transceiver, including optical power and model, which can help verify connectivity. 4.

Map WWN to Switch Port Locate the WWP

N in the output of show flogi database or show fcns database. The corresponding interface/port column indicates the physical switch port where the device is connected. 5.

Verify Connectivity Check the port status using show interface to ensure it is up and operational. You can also use a fiber optic power meter or OTDR for physical verification if needed.

Additional Tips

Zoning and VSANs: If the switch uses zoning, you can check which VSAN the WWN belongs to using show zone or show vsan. This helps confirm access permissions. Fabric Name Server: The switch maintains a fabric name server that registers all WWPNs.

Commands like show fcns database or show device-alias database can help identify devices by alias or WWN. Troubleshooting: If a WWN does not appear, ensure the device is powered on, the HBA is logged in, and the port is enabled. Check for errors using show logging or show interface.

By following these steps, you can accurately determine which fiber optic switch port corresponds to a given WWN, enabling effective SAN management, troubleshooting, and device mapping.