I have a headache about async dial backup. I have 2 site connected by leased line. Headquarter includes 2600, remote office has 1601. I will use 2600's Aux port and 1601's default sync/async port for backup. Remote office will call headquarter when main line gets down. I prepared a demo, Async interfaces get up when I disconnect main line. But there is no IP traffic, even when I open CDP there is no CDP traffic. I even checked arp cache.
I think you need to loose the 'async dynamic routing' command on both ends. Give that a try and let us know if you still have problems. Since you also have 'async default routing' I'm not sure which one is in force. Default routing is the default behavior on aux ports.
Try removing the backup interface command from S0/0 on the 2600, when you enter this command it places async interface 65 into a backup state where it will be unable to receive calls unless the main interface (S0/0) has also failed. Normally you only use this command on the router performing the dailup (1601) and leave the receiving router configured normally for dial in.
I noticed that when the primary line is up, on 2600 async interface seems up and spoofing, but 1600 ser0 (async interface) is in standby mode. When I check your link, it' s said that it should be up&spoofing when primary is up???
The 1600 should be in standby and the 2600 should be spoofing when the primary line is up. The link that was given earlier shows what you need to do next, which is get your static routes entered. You need two static routes on your 1600 and a floating static route on your 2600.
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