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Configure the connection between two switch optical ports

ODN and passive infrastructure knowledge brief Published 02 Dec 2024

Prepared for preliminary research by the GESTIONVAL ODN knowledge desk. Confirm network topology, split ratio, box or cabinet capacity, joint closure rating and loss budget against current standards and product documentation.

To connect two switches via optical ports, ensure compatible SFP modules, matching fiber types, correct TX/RX alignment, and proper port configuration including speed, duplex, and VLAN settings.Step 1: Verify Hardware Compatibility
  • SFP/SFP+ Modules: Check that both switches support the same type of optical module (SFP for 1Gbps, SFP+ for 10Gbps) and that the modules are compatible with the switch brand (Cisco, Huawei, H3C, etc.), .
  • Fiber Type: Ensure both switches use the same fiber mode: single-mode (OS2, long distance) or multi-mode (OM3/OM4, short distance) and that the fiber patch cords match the module type .
  • Wavelengths: For dual-fiber modules, both ends must use the same wavelength (e.g., 1310nm or 1550nm). For single-fiber BiDi modules, TX/RX wavelengths must be paired correctly (e.g., TX1310/RX1550 on one end and TX1550/RX1310 on the other), .
  • Distance and Power: Confirm that the optical power and sensitivity of the modules are within the supported range for the fiber length .
Step 2: Physical Connection
  • Insert the SFP modules into the optical ports of both switches.
  • Connect the fiber patch cord, ensuring TX of one module connects to RX of the other.
  • Avoid bending the fiber cable sharply and ensure connectors are clean .
Step 3: Switch Configuration
  • Enable the Port: Access the switch CLI via Console, Telnet, or SSH and enter the interface view. Use no shutdown (Cisco) or equivalent to activate the port .
  • Speed and Duplex: Set both ends to the same speed and full-duplex mode if auto-negotiation fails.
  • VLAN Assignment: Add the fiber port to the appropriate VLAN according to your network plan.
  • Save Configuration: Use write memory or save to preserve settings after reboot .
Step 4: Testing and Troubleshooting
  • Check the link status with commands like show interface status or sh ip interface brief.
  • If the link does not come up, verify:
    • SFP module compatibility and brand support
    • Fiber type and wavelength match
    • TX/RX alignment
    • Port speed and duplex settings
    • Clean and properly seated connectors
Step 5: Network Considerations
  • When cascading multiple switches, limit to no more than four layers to avoid performance issues .
  • Choose an appropriate topology (star, bus, or tree) based on network size and traffic requirements . By following these steps, you can establish a reliable fiber connection between two switches, ensuring proper communication and network performance.

Configure the connection between two switch optical ports - GESTIONVAL ODN INFRASTRUCTURE S.L. [PDF]

Configure the connection between two switch optical ports

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This reference is intended for preliminary ODN and passive infrastructure research. Topology, split ratio, box or cabinet capacity, closure rating, cable type, test limits and applicable standards must be verified for the specific project.

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