ISP link failover on EX4200

Hi,

In our setup SRX240 is forwarding internet traffic through ISP1 and SRX340 is forwarding internet traffic through ISP2. There are some static route configured on EX4200 to forward internet traffic towards respective SRX

Kindly suggest - If ISP1 goes down then EX4200 switch need to forward internet traffic towards SRX340. Failover configuration should be on EX4200 not on SRX.

Thank you...