The upstream/downstream router uses flow-based ECMP algorithm. When traffic reaches
CN-GW, it will distribute the traffic to one of the available CN-NGFWs through the
Traffic Interconnect (TI) link using symmetric hash algorithm. Traffic matching a
session from both directions (client to server and server to client) will always go
through the same CN-NGFW. Once the CN-NGFW process the traffic, and if you have set
a policy to
Allow
traffic, the traffic packet will be sent
back to the CN-GW to reach the server.