How to Configure TA with Serial interface to connect to ISP as a backup

w.ahmeds · ‎11-15-2001

Hi:

In our office we have a leased line connection to the ISP, and we are using 2500 series router with two serial ports and one Ethernet port. one serial port is connected to leased line and the other we have connected to external ISDN TA. The idea is, we want to use the second serial port for dial up purpose as a backup for the first serial port through ISDN TA. We are unable to do this. Please suggest the solution for this.

Thank You

Wais Ahmed S

Philip D'Ath · ‎11-17-2001

Configure the second serial port as you would normally for a dial up.

Then create a static default route to it with a high administrative distance (say 200). Then it should only kick in when the primary circuit goes down.