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Troubleshooting a Control Link Failure in an SRX Chassis Cluster

 

Problem

Description: The control link fails to come up in an SRX chassis cluster.

Environment: SRX chassis cluster

Symptoms: The status of the control link is displayed as down in the output of the show chassis cluster interfaces command. Here are sample outputs for an SRX branch device and a high-end SRX device.

Diagnosis

  1. Are the control link ports connected through a switch?

    • Yes:

      Remove the switch and connect the control link ports directly. Reboot the secondary node and check whether the control link is up.

    • No:

      Proceed to Step 2.

  2. Are the link LEDs for the control link ports on both the nodes lit green?

    • Yes:

      Proceed to Step 4.

    • No:

      The control link cable might be faulty. Proceed to Step 3.

  3. Change the cable connecting the control link ports and check the link LED. Is the LED lit green?

    • Yes:

      This indicates that the original cable was faulty. Reboot both the nodes simultaneously to come out of the bad state. If the control link does not come up after the reboot, proceed to Step 4.

    • No:

      Open a case with your technical support representative to resolve the issue. Proceed to Data Collection for Customer Support.

  4. Is this device an SRX5400, SRX5600, or SRX5800?

    • Yes:

      Reconfigure the control link on a different Services Processing Card (SPC), connect the cable to the new port, and reboot both the nodes.

      1. Check whether the control link status is up:

        • If the link is up, the issue is resolved.

          There might be a hardware issue with the SPC. Open a case with your technical support representative to resolve the hardware issue. Proceed to Data Collection for Customer Support.

        • If the link is still down, the transceivers might be faulty. Proceed to Step 5.

    • No:

      Verify that the correct ports are connected (see the following table):

      Port Type

      Port

      Management (fxp0)

      An Ethernet port on the Routing Engine

      HA Control

      (fxp1 or em0/em1)

      • Port 0 (fiber only) on SPC—em0

      • Port 1 (fiber only) on SPC—em1

      Fabric

      (fab0 and fab1)

      Any available ge or xe interface (fiber only)

      If the ports are connected correctly, and the link is still down, proceed to Step 5.

  5. If the control link port is an SFP or XFP port, change the transceivers on both the nodes. Ensure that you use transceivers provided by Juniper Networks and that the transceivers are of the same type (such as LX or SX). Is the control link up now?