GTP sessions

FortiOS Carrier FGSP supports GTP session synchronization, allowing you to synchronize GTP sessions among up to four entities (FortiGates or clusters) running FortiOS Carrier. No special configuration is required to support GTP session synchronization. GTP sessions are synchronized like any other TCP or UDP session.

One limitation to this configuration is that asymmetric routing is not supported. The router or load balancer that load balances the GTP sessions must send all of the packets of a session to the same FortiGate.

For GTP sessions to be synchronized, session synchronization must be enabled. Since most GTP traffic uses UDP you should also enable UDP session synchronization. For example:

config system ha

set session-pickup enable

set session-pickup-connectionless enable

end