Technical Tip: EBGP routes with MED Propagation

[imathew]

Description	This article describes that EBGP routes with MED attribute will not be sent from one EBGP peer to another EBGP peer.
Scope	FortiGate.
Solution	The BGP multiple exit discriminator (MED, or MULTI_EXIT_DISC) is a non-transitive attribute, meaning that it is not propagated throughout the Internet, but only to adjacent autonomous systems. Diagram: AWS-----Perimieter Firewall-----DMZ firewall Use the Prefix List to match the network. Create a route map. Configuring the MED Using the CLI: config router route-map     edit "NewMetric"     config rule         edit 1             set match-ip-address "<Prefix_List_Name>"             set set-metric 20         next     end next end Use the route map in the outbound direction towards the DMZ peer. config router bgp     config neighbor         edit "1.1.1.1"             set route-map-out "NewMetric"         end     end end Configuring the MED Using the GUI: Go to Network -> Routing Objects -> Create New -> Route Map and define the required parameters to configure the MED. Apply the Route Map to a BGP Neighbor: go to BGP -> Neighbors, and select the desired neighbor. Under Route Map Out, select the previously created route map from the dropdown list and Save the configuration