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Problem with async interface in 2811

Hello,

I tried to configure a backup interface to a remote site from an AUX port of a 2811 router. i have configure the primary interface (serial) and i have configure the AUX 0 line and 2 dialer interfaces. but when i tried to configure an async interface, it shows me an invalid input detected!!!

r2811#sh line

Tty Line Typ Tx/Rx A Modem Roty AccO AccI Uses Noise Overruns Int

* 0 0 CTY - - - - - 0 0 0/0 -

* 321 321 AUX 57600/57600 - inout - - - 0 0 0/0 -

322 322 VTY - - - - - 0 0 0/0 -

323 323 VTY - - - - - 0 0 0/0 -

324 324 VTY - - - - - 0 0 0/0 -

325 325 VTY - - - - - 0 0 0/0 -

326 326 VTY - - - - - 0 0 0/0 -

when I try to create an Async interface (interface async 321), it shows me an invalid input detected. (i tried int async 1) without a result.

Any help or assistance would greatly be appreciated.

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