Enable DDH on the fiber optic switch
To enable DDH on a fiber optic switch, you typically need to activate the optical ports and configure the interface to remain up even with unidirectional or partial fiber connections.
Steps to Enable DDH
1. Access the Switch Management Interface
- Use the switch's CLI via SSH, Telnet, or console connection, or the GUI if supported. For example, Dell MXG610s switches can be managed through the OpenManage Enterprise – Modular (OME-M) GUI or WebTools interface by entering the switch IP address in a browser .
- For Arista DMF switches, connect via CLI using
connect switch switch-nameor through SSH/Telnet . 2. Enable the Optical Ports - Ensure the SFP+ or QSFP transceivers are properly inserted and recognized. The port LEDs should indicate operational status (solid green for normal operation), .
- In Arista switches, use the Enable Optics option to leave the optical laser on even if the port goes down, which is essential for DDH functionality . 3. Force the Link Up
- Configure the interface to force link-up so that Layer 1 remains active even if only the transmit fiber is connected. This prevents the port from being disabled due to unidirectional fiber issues .
- CLI example (Arista DMF):
interface ethernet 1force link-upenable opticsThis ensures the port stays active for DDH monitoring. 4. Verify Port Status - Check the port LEDs or use CLI commands to confirm the port is online and not disabled. For Dell MXG610s, slow flashing green indicates the port is online but segmented, which may require troubleshooting if traffic is not passing .
- On Arista switches, you can use
show interfaces statusto verify the port state. 5. Save Configuration - After enabling the ports and configuring force link-up, save the configuration to ensure settings persist after a reboot. In CLI:
write memoryor use the GUI's Save button . 6. Optional: Enable Forward Error Correction (FEC) - If your switch supports FEC, enable it to improve link reliability over long fiber runs. Options include Reed-Solomon (CL91/CL108) or Fire-Code FEC . By following these steps, the fiber optic switch will have its ports active and ready for DDH operations, ensuring proper detection and handling of connected devices. This setup is critical for monitoring, redundancy, and maintaining high availability in fiber networks.
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