TheMulti-Exit Discriminator (MED)is aBGP attributeused to influence the preferred path for incoming traffic from an external autonomous system (AS). The diagram shows that FortiGate_1 advertisesMED 200, while FortiGate_2 advertisesMED 300, meaningthe ISP will prefer the route through FortiGate_1because alower MED is preferredin BGP.

To modify theMED valueon FortiGate_1 for routes advertised to AS 30, the administrator must configure aroute-map-out. A route map canmatch specific routesandset the MED valuebefore sending them to the BGP neighbor.