Description

This article explains why the secondary control link displays "Down" when two control links are connected with SFP-T on an SRX1400 cluster.

Symptoms

The commands and outputs below show the situation. 

root@srx1400a> show chassis cluster interfaces
Control link status: Up
Control interfaces:
    Index   Interface        Status
    0       em0              Up
    1       em1              Down  <--HERE

Control link statistics:
    Control link 0:
    	Heartbeat packets sent: 1656
    	Heartbeat packets received: 1641
    	Heartbeat packet errors: 0
    	Duplicate heartbeat packets received: 2
    Control link 1:
    	Heartbeat packets sent: 1656
    	Heartbeat packets received: 0  <--HERE
    	Heartbeat packet errors: 0
    	Duplicate heartbeat packets received: 0
		
		
root@srx1400b> show chassis cluster interfaces
Control link status: Up
Control interfaces:
    Index   Interface        Status
    0       em0              Up
    1       em1              Down  <--HERE

Control link statistics:
    Control link 0:
    	Heartbeat packets sent: 1689
    	Heartbeat packets received: 1691
    	Heartbeat packet errors: 0
    	Duplicate heartbeat packets received: 4
    Control link 1:
    	Heartbeat packets sent: 1689
    	Heartbeat packets received: 0  <--HERE
    	Heartbeat packet errors: 0
    	Duplicate heartbeat packets received: 0
		
root@srx1400a> show interfaces terse no-forwarding
em0                     up    up
em0.0                   up    up   inet     129.16.0.1/2
                                   tnp      0x1100004
em1                     up    up
em1.0                   up    up   inet     129.16.0.1/2
                                   tnp      0x1100004
								   
root@srx1400b> show interfaces terse no-forwarding
em0                     up    up
em0.0                   up    up   inet     130.16.0.1/2
                                   tnp      0x2100004
em1                     up    up
em1.0                   up    up   inet     130.16.0.1/2
                                   tnp      0x2100004

Solution


Support for the secondary control link (em1) interface using SFP-T on the SRX1400 was started in Junos OS 11.4R10.

If the Junos OS on your SRX1400 is older than version 11.4R10, upgrade to Junos OS 12.1X44-D25, 12.1X45-D15, or 12.1X46-D10.

If you have already upgraded the Junos OS on your SRX1400, the secondary control link on your SRX1400 might display "Down" when you power off/on (cold boot) the SRX1400 cluster. (This is due to a limitation in an internal chip.) The workarounds below can help resolve this issue (if em1 uses SFP-T, it will be down):

Workaround 1

  • Unplug all SFP-T from the control ports.
  • Plug the SFP receiver into the control ports.
  • Reboot your SRX1400 (do not power off/on). Both control links should be up. (Note: Rebooting the SRX1400 by "request system reboot" is a hot boot. It will not trigger this issue.)
  • Unplug the SFP receiver from the control ports.
  • Plug all SFP-T back into the control ports.

Workaround 2

  • Disable the cluster and re-add your SRX1400 to the cluster.