We have two Internet connectivity in our office. One is through Leased line and other through Business ADSL line. Right now we are routing the Internet traffic manually through policy based routing in L3 Core Switch and NaTing through both the PIX. Now we are planning for automatic backup routing by using these two lines. What is the procedure to do this? Please fine below the existing setup,
Internet Leased line setup:-
LL Modem ----> Internet Leased Router -----> Cisco PIX ---> Cisco Core L3 Switch -----> Users/Servers connected
Business ADSL Setup:-
ADSL Router -----> Cisco PIX ---> same Cisco Core L3 Switch -----> Users/Servers connected.