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Router Line Numbering 77
The line-numbering scheme is important when configuring a router. In the case of the 3600 and
2600 routers with the new modular interfaces, the line numbers are based on the slot that the
feature card is in. For illustration, consider the output in Example 4-2, which is from a 3640
series router with a modem card in slot 2. Notice that the line numbers for the internal modems
are 65­70 because only one MICA card is installed in the slot.
To properly configure a router, you must know the association between the line and interface
numbers. The AUX port on the modular routers is the last line number, which would be the
number of slots multiplied by 32, plus 1. In the case of the 3640 router shown in Example 4-2,
the AUX port number is 129, and the vty ports are 130­134 by default.
In Example 4-3, the configuration for a 3640 router has physical characteristics configured on
line 97 for the asynchronous interface in slot 3/0. The remaining IOS commands are discussed
in detail later in this chapter, but are presented here for completeness.
Example 4-2
show line Output from a 3640 Series Router with a Modem Card in Slot 2
router#show line
Tty Typ Tx/Rx A Modem Roty AccO AccI Uses Noise Overruns Int
* 0 CTY - - - - - 0 0 0/0 -
I 65 TTY - inout - - - 0 0 0/0 -
I 66 TTY - inout - - - 0 0 0/0 -
I 67 TTY - inout - - - 0 0 0/0 -
I 68 TTY - inout - - - 0 0 0/0 -
I 69 TTY - inout - - - 0 0 0/0 -
I 70 TTY - inout - - - 0 0 0/0 -
I 97 TTY 115200/115200- inout - - - 0 0 0/0 Se3/0
*129 AUX 9600/9600 - - - - - 0 0 0/0 -
130 VTY - - - - - 0 0 0/0 -
131 VTY - - - - - 0 0 0/0 -
132 VTY - - - - - 0 0 0/0 -
133 VTY - - - - - 0 0 0/0 -
134 VTY - - - - - 0 0 0/0 -
The following lines are not in asynchronous mode or are without hardware support:
1­64, 71­96, and 98­128.
Example 4-3
3640 Router Configuration
interface Serial3/0
physical-layer async
ip unnumbered Ethernet0/0
no ip directed-broadcast
encapsulation ppp
async mode interactive
peer default ip address pool TESTPOOL
no cdp enable
ppp authentication chap
!
line 97
password cisco
continues