While having multiple ISP links, it's needed to optimize the bandwidth using both ISPs. Each ISP connection is configured through an individual Exinda bridge.
This article provides clarifications about accumulated bandwidth optimization in a multi-ISP environment.
It is possible to set up the connection for one ISP on one bridge and use another bridge for another ISP link and this way you can create two Circuits to handle two different ISP links and apply Optimization accordingly for each ISP link in the policies.
Important: when having two ISP links connected on two different bridges, you can avail the Global QoS feature for applying the shaping across the bridges.
Please ensure the Circuit bandwidth matches the bandwidth of the ISP link for optimal performance. If needed, upgrade/downgrade the Circuit size as per contracted ISP value.
If you want to use both ISP links to provide better (accumulated) bandwidth, the circuit bandwidth can be configured to use a coalesced value of two ISPs. For example, the first ISP provides 200M speed and the second - 100M. Exinda's circuit bandwidth can be set to 300M value of two combined ISPs.
Note: if the Exinda is located outside the Firewall, all the traffic has NAT applied and hence due to this Layer 7 visibility is reduced and application-based shaping cannot be as effective as being inside the firewall.