It seems I have finally found a solution to the pesky problem of corrupt serial lines on Cisco 2500 routers. I have read of quite a few people complaining of the same issue. Tyson Scott of IPExpert gave me the following config:line 1 16 exec-timeout 0 0 logout-warning 240 no exec no history transport input telnet telnet speed 9600 9600 autohangup stopbits 1
If you add “aaa new-model” to this, you get rid of having to type clear line all the time. I hope this helps a few folks out there suffering with old 2500 routers.