2950 Managed by Async Terminal

[marshyrob]

Hello all

I have a 2600 with an async module in supporting upto 16 devices (terminal). I have managed to configure the terminal to connect to some of our routers via their Aux port, and bring up the password prompt without pressing the enter key.

Commands

Modem Host - on the terminal under the line config

Modem InOut - on the Router under the Aux line.

I cant seem to get it to connect to our 2950 switches via the console port (as they dont have an Aux port) with this same config as the console port does not support the modem InOut command.

This command was the only way i could get the password prompt up after logging in via the terminal without pressing the return key.

Does any one know of how i can set the console port up to allow the connection and bring the password prompt up.

Hope this makes sense.

Cheers

Rob

 

[eurobadger]

Hi

I think the issue is flow control. The AUX port on routers has hardware flow contol by default. The Console port defaults to no flow control.
It is possible to log into a router via the console port using a modem only if the modem is also set not to use flow control, and I think the same applies to the console port on your switch.

Hope that gives you a starting point. It might be worth searching CCO for informtion on remote support for Catalyst switches.

EB

 

[rtfmdude]

Rob,

Using the async module as a terminal server is pretty straightforward, just make sure you've got this under the async lines on the 2600:

line tty X

transport input all(or just telnet, to allow telnet sessions into that line)

speed 9600(or whatever to match the console port on the other device - 9600 is the default)

no flowcontrol(since there's no flowcontrol on the console, like eurobadger mentioned)

no exec(to prevent any line noise/whatever from starting an exec session INTO the 2600, you want outbound only)

The console port of the other device can be totally left alone, I mean, if you can connect to it using your terminal emulator of choice(like hyperterm) at 9600 8N1, then this config will work for you.

To connect, just make sure you reverse telnet using any valid ip address on the terminal server @ 2000+tty line #. So, for example, if you've connected the switch to line 35, then you'd telnet to x.x.x.x 2035. I usually configure a loopback interface and an ip host statement to speed that action up on the terminal server. You could get really elegant and write up a whole menu system if you wanted

If you ever get any 'connection refused' messages when trying to perform the reverse telnet, I bet the line is already in use somehow. Issue a 'show line' at the terminal server, check to see if there's an asterisk at the far left of the line in question, and issue a 'clear line XX' if necessary, then try again. Make sure you use the 'disconnect' command after you're done to free the line up again. (ctrl-shift-6, then x to bounce out of the switch, then type 'disco.' hitting the carriage return without typing anything will resume the session, the odd key sequence is just a momentary suspension).

hope that helps.

 

[marshyrob]

Thanks Guys

With a little bit of tinkering its all working, with bits from each of your examples.

Many thanks for you time.

Rob