firewall with bridge port

Dear sir,

my mikrotik firewall is between cisco adsl router which is port forwarding all the smtp traffic to exchange server 192.168.1.220.
I do not want to disturb any setting just i configured my mikrotik with all firewall filter rule , now i want make a master port say ethernet 1 and other ethernet 2 as slave of ehternet 1 and connect cisco router to ethernet 1 and local lan switch to ethernet 2. In this way do the all the firewall rule can inspect all the traffic going from cisco router to exchange server,


Thanks and regards