Programming a Cisco Router - The Basics
This is a sample Cisco router configuration, anything after the
"!" character on each line is a router comment line and need not be
typed in. Comments are displayed in italics to make them easier for you
to see. Lines in blue are the actual commands
that will need to be entered into the router. To program a new Cisco, exit the
automatic configuration script, enter the configuration mode, and type in the
lines below, substituting the data as needed.
To enter configuration mode telnet to your router and login. Next enter the password and hit enter. Type enable and enter your enable password. Finally, type conf t and hit enter. You will see a prompt that looks something like "dc(config)#" Where dc will be the name of your router as defined in the hostname statement of your configuration.
When you are done entering programming statements type ^z and type wr. This will exit the configuration terminal and write the changes to your routers flash memory. If you are unsure of the changes do not type WR until you know the changes are working. If you've made a mistake, simply power cycle the router to clear all the changes you have made. Once you type WR you will have to reprogram the router in order to correct any problems.
!
hostname Router ! see below
hostname (name of router)
!
! Put in a meaningful hostname instead of router. This will also
! determine how your prompt looks.
!
!
interface Ethernet0
int e0
ip address xxx.xxx.xxx.1 255.255.255.0
! see below
ip address (your class C.1)
255.255.255.0
!
! Put in your class C address above, ending in .1. This tells
the
! router which IP address to route to your LAN. Each Class C
! assigned must be added here or packets destined for those IP
! address will not be forwarded to your LAN.
!
!
interface Serial0
int s0
ip address 199.190.66.218 255.255.255.0 ! see below
ip address 199.190.(hub class
C).(your DLCI) 255.255.255.0
!
|
If your hub is: |
Use This Address: |
|
DC5a |
199.190.74.X |
|
DC5b |
199.190.66.X |
|
DC2 |
199.190.77.X |
|
SC5a |
199.190.67.X |
|
SC5b |
199.190.69.X |
|
SC3 |
199.190.72.X |
|
LA1 |
199.190.71.X |
!
! where "X" above is your DLCI number. You will
! have to call the NOC to get this number.
!
ip access-group 101 out
!
! This keeps your users from IP spoofing. There are a few lines
! involved in setting this up. See below.
!
encapsulation frame-relay
encapsulation
frame-relay
!
frame-relay map ip 199.190.66.1 111 IETF ! see below
frame-relay map ip (Hub IP) (Hub
DLCI) IETF
!
|
If your hub is: |
Use This Address: |
Use This DLCI: |
|
DC5a |
199.190.74.X |
72 |
|
DC5b |
199.190.66.X |
111 |
|
DC2 |
199.190.77.X |
various |
|
SC5a |
199.190.67.X |
100 |
|
SC5b |
199.190.69.X |
101 |
|
SC3 |
199.190.72.X |
16 |
|
LA1 |
199.190.71.X |
17 |
!
!
frame-relay lmi-type ansi
frame-relay lmi-type
ansi
!
interface Serial1 ! Will not be operational in most routers
no ip address
shutdown
!
no ip classless
ip route 0.0.0.0 0.0.0.0 199.190.66.1 ! see below
ip route 0.0.0.0 0.0.0.0 (router IP
number)
!
|
If your hub is: |
Use This Address: |
|
DC5a |
199.190.74.1 |
|
DC5b |
199.190.66.1 |
|
DC2 |
199.190.77.1 |
|
SC5a |
199.190.67.1 |
|
SC5b |
199.190.69.1 |
|
SC3 |
199.190.72.1 |
|
LA1 |
199.190.71.1 |
!
access-list 101 permit ip XXX.XXX.XXX.0 any ! see below
!
! ip access-group 101 out
! access-list 101 permit ip (your
class C.0) 0.0.0.255 any
!
line con 0
line con 0
password XXXXX
password (your login
password)
login
login
!
line vty 0 4
line vty 0 4
password XXXXX
password (your enable
mode password)
login
login
!
