Technical Tip: 'get system ha status' showing warning with 'mondev down' message

Description

This article describes details of the 'mondev down' warning message in the output of '# get system ha status'.

Scope

FortiGate.

Solution

The message informs about the monitored interface (device) being disconnected/down. The MONDEV stats section provides detailed information about each unit:

get sys ha status
HA Health Status:
WARNING: <FGT_SN1> has mondev down;
WARNING: <FGT_SN2> has mondev down;
...
MONDEV stats:
<FGT_SN1>(updated 2 seconds ago):
dmz: physical/00, down, rx-bytes/packets/dropped/errors=0/0/0/0, tx=0/0/0/0
internal1: physical/1000auto, up, rx-bytes/packets/dropped/errors=119438641/718328/0/0, tx=15734172/52365/0/0
internal2: physical/1000auto, up, rx-bytes/packets/dropped/errors=28674211/160134/0/0, tx=81650874/220765/0/0
<FGT_SN2>(updated 3 seconds ago):
dmz: physical/1000auto, up, rx-bytes/packets/dropped/errors=548591135/1479593/0/0, tx=506712283/1321938/0/0
internal1: physical/00, down, rx-bytes/packets/dropped/errors=0/0/0/0, tx=0/0/0/0
internal2: physical/1000auto, up, rx-bytes/packets/dropped/errors=25998976/252357/0/0, tx=1200/20/0/0

The interfaces under the MONDEV stats section are configured under the set monitor configuration:

config system ha
    set monitor "dmz" "internal1" "internal2"

To resolve the WARNING message, verify the connected cable is not damaged and make sure the cable is plugged in properly in FortiGate and the other device interface.

Related article:

Technical Tip: Troubleshooting unexpected High Availability (HA) failover