BIGIP F5 - How to check the Serial Cable via TMSH/Bigpipe

Within this article we will show you the commands to show the status of the serial cable i.e whether it is connected without the need to physically check the device.


The follow commands shows the status that the failover daemon detects on the serial cable from its failover peer.

Version Command
10.x b failover cable
11.x tmsh show sys failover cable


There are 3 outputs that can generated by running the previous command. They are,

Output Meaning
cable state 0 Active unit detects zero from its peer on the serial cable
cable state 1 Standby unit detects one from its peer on the serial cable
cable state unset Serial cable is not correctly connected.

Tags: BIG-IP F5, HighAvailability

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R Donato

Rick Donato is the Founder and Chief Editor of He currently works as an SDN/NFV Solutions Architect and has a keen interest in automation and the cloud.

You can find Rick on Twitter @f3lix001