Technical Tip: Static ISL command on auto ISL trunks

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Description	This article explains the importance of static ISL commands on auto ISL trunks.
Scope	FortiSwitch.
Solution	When using FortiSwitches managed by FortiLink, the equipment management uses VLAN 4094 and MSTP instance 15. By default, disconnections due to packet loss or STP switching on instance 0 may occur, since LLDP packets continue to be exchanged on VLAN 1. To avoid these disconnections, it is advisable to enable static ISL on the self-negotiated trunks. config switch trunk     edit "S224EPTF18-----8"         set static-isl enable     next end This will avoid that if there is any problem on instance 0 of step, there will be intermittencies in the administration of the equipment