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.

10.xb failover cable
11.xtmsh show sys failover cable


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

cable state 0Active unit detects zero from its peer on the serial cable
cable state 1Standby unit detects one from its peer on the serial cable
cable state unsetSerial cable is not correctly connected.
Rick Donato

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