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Webcast-Catalyst9k
New Member

IOS Configuration & VTY's

This is hopefully a simple question but I was curious about the way VTY's were displayed in the running configuration.

From my understanding vty's 0 thru 4 can not be deleted. On IOS 12.2(17a) I'm able to issue configuration commands for vty's lines 0 thru 15, and when I remove the issued commands, it only displays vty's 5 thru 15 in the running configuration.

example:

#show running-config

....

!

line con 0

session-timeout 10

stopbits 1

flowcontrol hardware

line aux 0

line vty 0 4

!

#configure t

(config)# line vty 0 15

(config-line)# full-help

(config-line)# exit

(config)# exit

#show running-config

....

!

line con 0

session-timeout 10

stopbits 1

flowcontrol hardware

line aux 0

line vty 0 4

full-help

line vty 5 15

full-help

!

#configure t

(config)# line vty 0 15

(config-line)# no full-help

(config-line)# exit

(config)# exit

#show running-config

....

!

line con 0

session-timeout 10

stopbits 1

flowcontrol hardware

line aux 0

line vty 5 15

!

Why doesn't the config list the vty's as being in one group when they're all configured identically? Why does IOS not list the active vty's 0 thru 4 in the configuration?

Just a bit curious about this because it annoys the ____ out of me.

1 REPLY
Anonymous
N/A

Re: IOS Configuration & VTY's

I think you can check in Cisco's BugToolkit to find if there are any bugs associated with this. Normal scenario is that you cannot delete line vty 0 4. It will give an error saying "the last 5 vty lines cannopt be deletd.

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