Technical Tip: The proper way to remove the Trunk link between FortiSwitches

[tino_p]

Description	This article describes the proper way to remove the trunk links between FortiSwitches.
Scope	FortiSwitch
Solution	Given the network topology, by default, the connection between the Core-switch and Access-switch is 'Inter-Switch-Link' (ISL), with lldp-profile of 'default-auto-isl' on port1 of both FortiSwitches: The proper way to remove this trunk link is: Step 1: Change the lldp-profile in the leaf (or downstream) switch. config switch-controller managed-switch     edit <access-SW>       --> For the above example: S124EF4N17000159.         config ports             edit port1                 set lldp-profile default         end end Step 2: Change the lldp-profile in the CORE (or upstream) switch: config switch-controller managed-switch     edit <CORE-SW>       --> For above example: S124FFTF23014945.         config ports             edit port1                 set lldp-profile default         end end With this order, the ISL trunk should be deleted in 1-2 minutes in the FortiSwitch, so that the FortiGate GUI page will reflect faster.