I have a link to my headoffice in ADSL. I am using ADSL Modem having ADSL interface and Ethernet Interface. This Ethernet Interface is connected to Cisco 1841 Router. I want to backup this link using ISDN.
I have configured both Ethernet Interface and ISDN and it is working perfectly.
But ISDN link is not coming up when the primary links is down. Then i found that, even though the ADSL link is down the Ethernet remains up due to ADSL Modem is ON.
How i have to configure my router to dynamically detect the link failure and bring the ISDN up and make the ISDN down once the ADSL (Primary) link is up again
Can you please help me
ip sla is used with static routing. However if you have EIGRP configured over the ADSL connection then the route will drop out of the routing table when the line goes down.
Are you sure that the route is still staying in the routing table? When the primary link goes down what routing mechanism are you using to bring up the ISDN (EIGRP or floating static?)
If you prefer then please post your configuration.