Technical Tip: 'rtl_vlan_based_port_isolation_add crash' explained on the FortiSwtich-1XXE series

[zendodg]

Description	This article explains 'rtl_vlan_based_port_isolation_add crash'.
Scope	FortiSwitch.
Solution	When running the command 'diag debug crashlog read' on the FortiSwtich-1XXE series, the next crash could be visible: 2023-08-07 10:19:28 rtl_vlan_based_port_isolation_add() No free entry found 2023-08-11 06:44:18 rtl_vlan_based_port_isolation_add() No free entry found 2023-08-11 06:44:18 rtl_vlan_based_port_isolation_add() No free entry found 2023-08-11 06:45:11 rtl_vlan_based_port_isolation_add() No free entry found 2023-08-11 06:45:11 rtl_vlan_based_port_isolation_add() No free entry found 2023-08-11 06:45:11 rtl_vlan_based_port_isolation_add() No free entry found 2023-11-16 11:10:08 rtl_vlan_based_port_isolation_add() No free entry found 2023-11-16 11:10:08 rtl_vlan_based_port_isolation_add() No free entry found 2023-12-07 06:59:30 rtl_vlan_based_port_isolation_add() No free entry found 2023-12-07 06:59:30 rtl_vlan_based_port_isolation_add() No free entry found 2023-12-07 06:59:30 rtl_vlan_based_port_isolation_add() No free entry found 2023-12-20 06:00:20 rtl_vlan_based_port_isolation_add() No free entry found 2023-12-20 06:00:20 rtl_vlan_based_port_isolation_add() No free entry found 2023-12-20 06:00:20 rtl_vlan_based_port_isolation_add() No free entry found This crash means that a lot of VLANs access are used.  FortiSwtich-1XXE series supports 16 VLANs access only, so the device is failing to deploy more. Make sure not to have more than 16 VLANs access on FortiLink.  Note:  Access VLANs are FortiLink VLANS that have the 'Block intra-VLAN traffic' option enabled.