User guide

A-50 Cisco 2500 Series Access Server User Guide
Asynchronous Protocols
The EXEC Session
When a dial-in user connects to an asynchronous line on the access server, the session
received after the security dialog is called an EXEC session. From an EXEC session, you
can use terminal services (such as Telnet or rlogin), run an asynchronous protocol over the
line, or use one of many other access server services. For example, you can enter the
command ppp to initiate a PPP session.
Launching Autoselect
The access server can launch three asynchronous protocols (PPP, SLIP, or ARA)
automatically if it detects that the remote device is using one of these protocols. The
automatic detection of the asynchronous protocol is called autoselect. Autoselect will
bypass the EXEC security dialog. If you use autoselect, we strongly recommend that you
use the authentication techniques built into the asynchronous protocols. (See Figure A-15.)
Figure A-15 Flowchart for EXEC and AutoSelect Authentication Options
H3111
Autoselect
CHAP/PAP
authentication
Login
security
PPP
EXEC