Async Lines on Cisco Device

[ameen.ahmed]

Dear Friends,

In cisco devices, under 'show line' output, the Tty line number associated with AUX is 65. (Sometimes the corresponding Tty line will be 5 or 1, it depends on internal architechture).

Router# show line

   Tty Typ     Tx/Rx    A Modem  Roty AccO AccI   Uses   Noise  Overruns   Int

     0 CTY              -    -      -    -    -      0       0     0/0       -

*   33 TTY  19200/19200 -    -      -    -    -    150     178     0/0       -

    34 TTY  19200/19200 -    -      -    -    -      0       0     0/0       -

    35 TTY  19200/19200 -    -      -    -    -      0       0     0/0       -

    36 TTY  19200/19200 -    -      -    -    -      0       0     0/0       -

    37 TTY  19200/19200 -    -      -    -    -      0       0     0/0       -

    47 TTY  19200/19200 -    -      -    -    -      0       0     0/0       -
    48 TTY  19200/19200 -    -      -    -    -      0       0     0/0       -
    49 TTY  19200/19200 -    -      -    -    -      0       0     0/0       -
    50 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -
    57 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -
    58 TTY   9600/9600  -    -      -    -    -   2117       0     0/0       -

    59 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -

    60 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -

    61 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -

    62 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -

    65 AUX 115200/115200- inout     -    -    -      0       0     0/0       -

Line(s) not in async mode -or- with no hardware support:

1-32

Router#

My question is, if we want to configure the Aux port, where do we need to configure? In other words, what is the difference between the below configurations,

Router(config)#line aux 0

Router(config-line)#modem inout

Router(config-line)#speed 115200

Router(config-line)#transport input all

Router(config-line)#login

Router(config-line)#password cisco

Or, under the line 65, like,

Router(config)#line aux 65

Router(config-line)#modem inout

Router(config-line)#speed 115200

Router(config-line)#transport input all

Router(config-line)#login

Router(config-line)#password cisco

----------------

I can see documents which configures under both lines 0 and 65. Please help.

Thanks,

Ameen Ahmed.

[Peter Paluch · Accepted solution]

Hello,

Saying line 65 is the same as saying line aux 0. See:

Router(config)#do show run | begin line
line con 0
line aux 0
line vty 0 4
 login
!
!
end
Router(config)#line 65
Router(config-line)#modem inOut
Router(config-line)#speed 115200
Router(config-line)#transport input all
Router(config-line)#password cisco
Router(config-line)#login
Router(config-line)#exit
Router(config)#do show run | begin line
line con 0
line aux 0
 password cisco
 login
 modem InOut
 transport input all
 speed 115200
line vty 0 4
 login
!
!

I have configured the line 65, but the line 65 in this platform (Cisco 2691) corresponds to the aux 0, so my configuration was actually added to the line aux 0.

This is similar to configuring the subinterface with the subnumber 0 (i.e. Fa0/0.0, Serial0/0.0) - it in fact corresponds to the physical interface itself, i.e. Fa0/0 or S0/0 directly.

Best regards,

Peter

[ameen.ahmed]

Dear Peter,

Thanks a lot, you saved my life.. Now the cocept is very clear..

Thank you so much, once again..

Regards,

Ameen Ahmed.