Troubleshooting AS2511-RJ Access Router

There was a similar post the other day regarding troubleshooting with a 2621 access router, which appeared to be a hardware issue.

I'm having an issue with an AS2511-RJ access router. I have setup the access router to connect to 3 devices successfully. The problem is switching between the devices is extremely slow ...to basically not connecting.

The switch command is Ctrl-Shift-6 then x to exit the current session. Simply by entering the Conn number you will connect to that device.


When I try to connect to a device I get the following:

[Trying host1 (192.168.1.1, 2001) ... Open]
The prompt will sit here and no key combinations will work, after awhile you can hit Ctrl-Shift-6 and x to exit. But the session will establish as I have verfied this with the show sessions command.

Or

Switching between connections the prompt sits at:
[Resuming connection 1 to host1 ... ]
And once again, after a couple minutes the Ctrl-Shift-6 and x command will exit me back to the access router.

Something isn't right, the time for devices to connect and the key commands.

I have read the following documentation:
www.cisco.com/en/US/tech/tk801/tk36/tech...014f8e7.shtml#NetPro

And have posted a related speed/performance issue with the 25xx access router here:
www.firewall.cx/ftopict-6450.html

Any thoughts?


Cheers,

ZiPPy

As far as your speed question, your 2511 has a 20mhz processor and my 2621 has a 50mhz processor. I can say that my 2621 does respond alittle slower than the 2811's that I've configured for my customers.

I have seen before that constant open telnet connections can slow down the router all together. You might be seeing that happen to you. I would recommend keeping your connections limited.

I could understand the speed being slow between the 20MHz processor and 50MHz devices, but that is from a show run command or the like. What about the telnet connections? How long does your sit for before successfully connecting? I mean even to switch between sessions, it just sits there in [Trying host1 (192.168.1.1, 2001) ... Open]

Now here is something interesting the very first connection to another host works perfectly! I console into the access router enter telnet and then the host name and it connects showing [Trying host1 (192.168.1.1, 2001) ... Open] I hit enter and right away it shows the prompt of that device. After I try to connect to the second device, it just sits at [Trying host1 (192.168.1.1, 2001) ... Open] until you enter the break command to get to the access router prompt. Keep in mind the connection does establish in the background, as entering a show sessions proves this fact.

I am at a total loss, something just isn't right here. Now that I think about it, I don't think this is a performance issue at all, as many people use access routers for this exact purpose.


ZiPPy

I figured out what was causing the problem. When you configure each device on the 2511 you enter each entry as shown:

Router(config)#ip host hostname 2001 192.168.1.1
Router(config)#ip host hostname2 2002 192.168.1.1

And you continue to add each device specifying the hostname and the console port. Some of the console port numbers were incorrect, which is why the prompt held at "Trying ... " You start with the number 2001 which is console port 1, 2002 console port 2 and so on.

A rather simple solution, but one that can be easily overlooked. Currently two of the connections out of the 9 don't work. So I will begin troubleshooting why those devices won't connect.


Cheers,

ZiPPy

One thing I have to do from time to time is clear the line...

clear line 2

I always try and make sure I clear each line as I am finished on each device. I found a easy way on controlling my telnet session out of the “aux” port,

Alias exec auxup telnet 127.0.0.11 2097
Alias exec auxdown clear line 97

I'm planning to implement this onto my terminal server. The 2821 terminal sever that just installed and configured has the more traditional form of using “ip host”. Before you configure each line, check “Show Line” so you can verify what the first starting line number you have.