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Understanding Access Server

Would again appreciate any help on the use of access server, as i came accrss this in books and CBTs that it could save me a lot of time of recabling.

Can anyone please explain how this works and any recoomendation module? (Heard of router 2511 as one option)

Comment awaited,

Thanks in Advance

Community Member

Re: Understanding Access Server

Re: Understanding Access Server

Hi, [Pls RATE if HELPS]

Refer the Details below:

Configuring a Cisco Router as Terminal Server:


You want to have console connectivity to all your routers at the same time. By using a terminal server (2509-2512 router range) we can accomplish this.

To use a terminal server we need a 2509/2510 8 lines or 2511/2512 16 lines router and 1 or 2 octal cables.

The first thing we do is create a loopback interface that will be used for the reverse telnet sessions from the other devices.

Router(config)#interface loopback0

Router(config-if)#ip address

Now we add the devices that are connected to this router [octable cable to each console port]

Router(config)#ip host hostname 2001

Router(config)#ip host hostname2 2002

The previous commands lets you use the hostname of the device to access it on it's console port. The portnumber is made of the following 200x where x is the nr on the octal cable going to that device. Depending on the type of router you use for terminal server you can have either 8 or 16 devices hanging of it.

Now that the router is configured we use the following commands to navigate.

- to access a device

telnet 2001

- to switch between active sessions

ctrl-shift-6-x will bring you back to terminal server

show sessions will display the active sessions

entering a number of a session will let you access that session

- to disconnect a session

use the disconnect command


Best Regards,

Guru Prasad R

Community Member

Re: Understanding Access Server

Do you have to use a 2500 series to create an access-server? I have some 2600 routers that I could use. What type of card would I need to install to make an access-server possible.

Re: Understanding Access Server

Hi Tyler,

No its not a must, the 2500 is simply the cheapest option, i use 2600 routers with async port adapters (NM-16A), plus CAB-OCTAL-ASYNC cables.


Mohammed Mahmoud.

Community Member

Re: Understanding Access Server

Great, Thanks.

Community Member

Re: Understanding Access Server

I've got a weird problem and wondering if my config is incorrect in regards to an Access Server. When I try to connect to another device it just hangs on:


Trying R2 (, 2002)... Open

and then I have to use ctrl shift 6 X to get back into the AS

Though sometimes it works when i start changing plugs around and then plugging it back. I've got a cisco 2511 AS and heres my config:

interface Loopback0

ip address

no ip directed-broadcast

no ip route-cache

ip host R1 2001

ip host R2 2002

ip host R3 2003

ip host R4 2004

ip host R5 2005

ip host R6 2006

ip host R7 2007

ip host R8 2008

line con 0

exec-timeout 0 0

logging synchronous

line 1 16

no exec

transport input all

line aux 0

transport input all

line vty 0 4



Any ideas on why it would be hanging?

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