Page 202, int command

[pinguino001]

Hi Todd/all,
in the example on top of the page 202 it says to digit the following
commands:

Todd#config t
Todd(config)# int s0/0/0
..

but on CCNA Virtual Lab (enclosed to the book) the int s0/0/0 command is not accepted :confused: as shown in the following printout:

Todd#config t
Enter configuration commands, one per line. End with CNTL/Z
Todd(config)#int s?

serial

Todd(config)#int s0?

/



Todd(config)#int s0/?

<0-1> Serial interface number

Todd(config)#int s0/0?

. : <0-1>

Todd(config)#int s0/0/0
^
% Invalid input detected at '^' marker.
Todd(config)#int s0/0/?
% Unrecognized command

Todd(config)#int s0/0 ?

<cr>

Todd(config)#int s0/0
Todd(config-if)#


Please, can you tell me what does the 3rd 0 stand for in the command int s0/0/0?

Thanks you:)
Regards
/marco

[lammle]

I know the interfaces are super confusing on the new Integrated Services Router (ISR), but they are really cool routers, and are replacing all the other routers.

The serial interfaces now start with serial 0/0/0, then 0/0/1, then possibly 0/1/0 and 0/1/1 and so on.

Honestly, it's a hard question, what the third slash for? Well, Cisco has some answers, none good. In their courseware, which is wrong as much as it is right, they say "slot/subslot/port", but this can't be right because I have a 3845 router with six slots and the first "0" in 0/x/y never changes.

To me it is router/slot/port, where the router port is for future use, possibly where multiple routers can connect together in the future across the backplane, but I am not sure. However, I am sure that that first 0 never has changed in all my testing in literally dozens of router.

So basically, ignore the first zero and just use it as slot/port, however, you have to type the first zero in to access the slot and port.

In the program you have, the routers are not ISR so they do not have that first zero to confuse you. This is not a big deal as once you choose an interface you the are in interface configuration mode and basically everything is the same from there.

slot/port or 0/slot/port, both just get you into the interface configuration mode.

Hope this helped.
Cheers!
Todd Lamle