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Setup the fail-open switch and Sensor

  • Published on Oct 5, 2026
  • 1 minute(s) read
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Begin by configuring parameters for the fail-open switch and then connecting it to an inline Sensor. This setup does not have the provision to connect an RJ45-DB9 RS232 cable to a Windows PC after it has been installed in a rack, so the parameters for the fail-open switch will first be set up.

  1. Connect one end of the cable to RJ45 port of the fail-open switch.

  2. Connect the other end of the cable to DB9 port of the Windows computer.

  3. Connect the power cables to the ports at the back of the fail-open switch.

  4. Open PuTTy and click Serial.

  5. Enter Speed as 115200 which is the baud rate for a fail-open switch.

  6. Click Open.

    The fail-open switch CLI interface appears.

  7. Use administrator credentials to log on to the fail-open switch.

    You are provided access to the fail-open switch command prompt.

  8. To set up the fail-open switch IPv4 address, type management eth-if ip xxx.xxx.xxx.xxx and press Enter. For example, management eth-if ip 10.10.10.1.

    When selecting an IP address, make sure you are able to reach the SNMP server that you intend to set up.

  9. To set up the fail-open switch subnet mask, type management eth-if ip-mask xxx.xxx.xxx.xxx and press Enter. For example, management eth-if ip-mask 255.255.255.0.

  10. To set up the default gateway IPv4 address, type management eth-if default-gateway xxx.xxx.xxx.xxx and press Enter. For example, management eth-if default-gateway 10.10.10.2.

  11. To set up the SNMP manager IP address, type set manager <SNMP manager IPv4 address> and press Enter.

  12. After you have set up fail-open switch parameters, unplug the RS232 cable and power cables.

  13. Install the fail-open switch in the rack in a way that you are able to connect it to the Sensor.

  14. Gently insert the 100G-SR4 or 100G-LR4 module(s) into the slots in the front of the fail-open switch.

  15. Connect the MTP/MPO Fiber cables between the fail-open switch and the Sensor if you have inserted a 100G-SR4 module. If you have inserted a 100G-LR4 module, connect the LC Fiber cables between the fail-open switch and the Sensor.

  16. Connect an RJ-45 cable to the Management Port on the front of the fail-open switch.

  17. Connect the power cables back to the fail-open switch.

  18. Configure port pair G0/1-G0/2 as Inline Fail Open – Active.

  19. Click Save.

    The link lights on the fail-open switch and Sensor ports must come on to indicate that the fail-open switch has been set up.

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