Technical Note: Will a VLAN switch right away if a MAC Notification trap is received?

[FortiKoala]

Description

When the MAC Notification trap is received from a port where a host connects, will the VLAN be changed right away if the Current VLAN is NOT the correct one, or will it wait for the next L2 Poll?

Scope
Version: All
Solution

L2 Polling collects MAC and connection data (where the MAC address is located on the switch).  MAC notification traps already contain this information.  Therefore, the host is evaluated once the MAC Notification trap is received. 

If the port is enforced, and the current VLAN is not appropriate for the host, the VLAN will switch.

Note:  This behavior may not be consistent if the correct current VLAN information is not accurate.  Such a situation can occur if VLANs were manually changed on the switch itself.  See related KB article below.

For details on configuration traps for MAC Notification, refer to the Fortinet Document Library.

Related Articles

Technical Note: Best practice for manually changing VLANs on managed switches