You can view a fiber optic switch configuration using show commands to inspect system info, interface status, VLANs, VSANs, zoning, and fabric topology.

Viewing Configuration on Ethernet Fiber Switches

For Ethernet switches with fiber ports, such as Cisco Catalyst series:

• Connect to the switch via console, SSH, or Telnet using a terminal client like PuTTY, ensuring your computer is on the same IP range as the switch .
• Check interface status: Use commands like show interfaces status or show running-config to see port configurations, speed, duplex, and whether the port is set to fiber mode .
• VLAN information: Use show vlan brief to view VLAN assignments for fiber-enabled ports .
• SFP module details: Commands like show interfaces transceiver display optical module type, wavelength, and power levels .
• Troubleshooting: If a fiber link is not operational, verify the port mode, SFP compatibility, and cabling specifications .

Viewing Configuration on Fibre Channel (FC) SAN Switches

For Cisco MDS or Nexus FC switches:

• General system info: show version or show system displays software/hardware versions, uptime, and environmental status .
• Interface & port info: show interface fc1/1 or show interface brief provides operational state, speed, and optical module details. You can also see logged-in FC devices (WWPN/WWNN) and port statistics .
• VSAN and zoning: show vsan lists configured VSANs and their associated ports. show zone or show zoneset active displays active zoning configurations and zone members .
• Fabric and topology: show fspf database or show fabric provides a high-level view of the fabric topology and registered WWPNs .
• Performance monitoring: show logging and show interface counters help track errors, throughput, and system events .

Key Considerations

• Always verify the type of switch (Ethernet vs. Fibre Channel) to use the correct commands and interpret results properly .
• Use original compatible SFPs to avoid unpredictable behavior and ensure accurate status reporting .
• For FC switches, remember that virtual FC interfaces may have limited features compared to native FC ports, and some attributes are read-only in operational mode . By using these commands and procedures, you can comprehensively view the configuration, operational status, and connectivity of fiber optic switches in both Ethernet and SAN environments.