This article describes how to verify when the ISL FortiLink trunk is not configured automatically on the FortiSwitches.
Scope
FortiSwitch(FSW) is managed by FortiGate version v7.x and above.
Solution
When two FortiSwitches are inter-connected, both FortiSwitches automatically configure the ISL FortiLink trunk.
In this case, the trunk is not configured automatically between the FortiSwitches and it is necessary to verify the below configuration on both FortiSwitches: For eg. FSW1 port1 connected to port1 FSW2.
LLDP profile mapped to the ports should be default-auto-isl LLDP profile.
FSW# show switch physical-port port1
config switch physical-port edit "port1" set lldp-profile "default-auto-isl" set speed auto next end
Verify that auto-isl is enabled under switch global:
sh full-configuration switch global
config switch global set auto-isl enable
end
auto-network should be enabled:
FSW# config switch auto-network set mgmt-vlan 4094 set status enable end
Both FortiSwitches should form the automatic trunk, and verify by using the command 'show switch trunk' on both FortiSwitches CLI.
