Troubleshooting a Control Link Failure in an SRX Chassis Cluster

Problem

• Description
• Environment
• Symptoms

{primary:node0}
root@J-SRX-branch> show chassis cluster interfaces
Control link 0 name: fxp1
Control link status: Down

{primary:node0}
root@J-SRX-highend> show chassis cluster interfaces
Control link 0 name: em0
Control link 1 name: em1
Control link status: Down

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.

     • If the link is up, then there might be an issue in the chassis cluster setup on the Layer 2 switch network. See SRX Series Gateway Cluster Deployment in Layer 2 Network.

     • If the link is down, proceed to Step 2.

   • 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?

   • Yes: The issue is resolved.

     The transceiver might be faulty. Open a case with your technical support representative to resolve the issue with the transceivers. Proceed to Data Collection for Customer Support.

   • No: Continue to troubleshoot this issue with your technical support representative. Proceed to Data Collection for Customer Support.