New protocol for handling HA chassis ID conflicts

If both FortiGate-6000s or 7000s in a cluster are configured with the same chassis ID, both chassis begin operating in HA mode without forming a cluster. A message similar to the following is displayed on the CLI console of both devices:

HA cannot be formed because this box's chassis-id 1 is the same from the HA peer 'F76E9D3E17000001' chassis-id 1.

As well, a log message similar to the following is created:

Jan 29 16:29:46 10.160.45.70 date=2020-01-29 time=16:29:51 devname="CH-02" devid="F76E9D3E17000001" slot=1 logid="0108037904" type="event" subtype="ha" level="error" vd="mgmt-vdom" eventtime=1580344192162305962 tz="-0800" logdesc="Device set as HA master" msg="HA group detected chassis-id conflict" ha_group=7 sn="F76E9DT018900001 chassis-id=1"

You can resolve this issue by logging into one of the FortiGates and changing its Chassis ID to 2. When this happens, the two chassis will form a cluster.