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Beginner

Adding virtual terminal (vty) lines

I've read in multiple places that you can increase the number of virtual terminal lines by typing "line vty [some high number]". When I try on a 2511 with IOS 12.2 installed, it responds with an error: "Invalid input detected". When I try "line vty ?", it responds with "<0-4> First Line number". When I try "line vty 0 ?", it responds with "<1-4> Last Line number". How can I get more than 5 virtual terminal lines? Do I have to enable protocol translation or something? If so, how do I do that?

Thanks in advance,

Ben

5 REPLIES 5
Advisor

Re: Adding virtual terminal (vty) lines

You can't on a ancient box like that , 4 is max , most newer routers have up to 15 lines . not really sure why you would ever need more than 4 at 1 time anyway .

Beginner

Re: Adding virtual terminal (vty) lines

It says in http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_configuration_guide_chapter09186a008009f412.html#wp1001991 that a 2500 series router can have up to 182 virtual lines. I also have access to 2621 series routers which also have 182 virtual lines available. The reason I need so many is that I'm using udptn to multiplex a single serial line so that multiple tcp connections can listen to the serial data. I've configured udptn on the serial line to send data to the broadcast address. Now I want to connect to the router on multiple vty's and listen to the broadcast data.

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Beginner

Re: Adding virtual terminal (vty) lines

As far as I remember, the number of available vty lines depends on the IOS that runs on that machine. So you might be able to get more lines by upgrading the software.

Participant

Re: Adding virtual terminal (vty) lines

Try using this command line vty 5-15.

Ninja

Beginner

Re: Adding virtual terminal (vty) lines

I figured out the solution to my wose. The version of IOS I was using did not support protocol translation and virtual asynchronous interfaces. By changing to the Remote Access Server feature set, I'm now able to have 182 vty lines.

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