Cisco Notes

   Basic Useful Router Commands:

   Router>enable

   Router#config terminal

   Router(config)#hostname R1

   R1(config)#banner motd #Authorized access only! Updated last April 2009#

   R1(config)#no ip domain-lookup                       <!--Note: Stops auto domain translation-->

   R1(config)#enable password password

   R1(config)#enable secret secretpassword

   R1(config)#line console 0

   R1(config-line)#password password

   R1(config-line)#login

   R1(config-line)#exit

   R1(config)#line vty 0 4

   R1(config-line)#password password

   R1(config-line)#login

   R1(config-line)#exit

   R1(config)#int fa 0/0

   R1(config-int)#ip add 192.168.0.1 255.255.255.0

   R1(config-int)#no shut

   R1(config-int)#exit

   R1(config)#int s 0/0/0

   R1(config-int)#ip add 192.168.1.1 255.255.255.252

   R1(config-int)#clock rate 56000

   R1(config-int)#no shut

   R1(config-int)#exit

   R1(config)#int vlan 1                            <!--Note: Fast ethernet Interfaces 0 to 3 are assigned to vlan 1 by default-->

   R1(config-int)#ip add 192.168.10.1 255.255.255.0

   R1(config-int)#no shut

   R1(config-int)#exit

   R1#(config)#int loopback 0

   R1(config-int)#ip add 192.168.2.1 255.255.255.0

   R1(config-int)#no shut

   R1(config-int)#exit

   R1(config)#router rip

   R1(config-router)#version 2

   R1(config-router)#network 192.168.0.0

   R1(config-router)#network 192.168.1.0

   R1(config-router)#default-information originate     <!--Note: Router distributes default route to other routers-->

   R1(config-router)#no auto-summary             <!--Note: Rip Version 2 has auto-summary activated at default setting-->

   R1(config-router)#exit

   R1(config)#ip host R1 192.168.0.1 192.168.1.1       <!--Note: Adds routes to router table -->

   R1(config)#copy run start

   R1(config)#exit

   R1#show ip route

   R1#show ip protocol

   R1#show ip interface brief

   R1#debug ip rip

   R1#undebug all

   R1#

   Using Dynamic Host Configuration Protocol

   R1(config)#ip dhcp pool poolname

   R1(dhcp-config)#network 192.168.3.0 255.255.255.0

   R1(dhcp-config)#domain-name mydomain.com

   R1(dhcp-config)#dns-server 192.168.1.1

   R1(dhcp-config)#dns-server 192.168.1.1

   R1(dhcp-config)#netbios-name-server 192.168.1.1

   R1(dhcp-config)#exit

   R1(config)#ip dhcp excluded-address 192.168.1.1 192.168.1.10

   Using static routes:

   R1(config)#ip route (destination network) (subnet mask) (interface address/name)

   R1(config)#ip route 172.16.1.0 255.255.255.0 s 0/0/2

   R1(config)#ip route 172.16.1.0 255.255.255.0 192.168.1.1

   R1(config)# 0.0.0.0 0.0.0.0 s 0/0/2                      <!--Note: This is the format for a default route-->

   Using EIGRP

   R1(config)#router eigrp 1             <!--Note: Use the same autonomous system number for same network devices-->

   R1(config-router)#network 192.168.0.1 0.0.0.255

   R1(config-router)#metric weights 0 1 0 1 0 0

   R1(config-router)#no auto-summary             <!--Note: Auto-summary is on by default; used to disable it-->

   R1(config-router)#ip summary-address eigrp 1 192.168.0.0 255.255.252.0

   R1(config)#int loopback 1

   R1(config-int)#ip add 192.168.4.1 255.255.255.0

   R1(config-int)#bandwidth 64                      <!--Note: Change bandwidth setting of interface (in kilobits)-->

   R1(config-int)#ip bandwidth-percent eigrp 1 50         <!--Note: Percentage of bandwidth to be used by interface-->

   R1(config-int)#ip hello-interval eigrp 1 60                  <!--Note: hello interval in seconds-->

   R1(config-int)#ip hold-time eigrp 1 180                     <!--Note: hold time interval in seconds-->

   R1(config-int)#no shut

   R1(config-int)#exit

   R1(config)#ip route 0.0.0.0 0.0.0.0 loopback 1

   R1(config)#router eigrp 1

   R1(config-router)#redistribute static       <!--Note: required by static default route to distribute route in updates-->

   R1#show ip eigrp neighbors

   R1#show ip protocol

   R1#show ip route

   R1#show interfaces

   R1#debug eigrp fsm

   R1#undebug all

   Using IGRP

   R1(config)#router igrp 100       <!--Note: Use the same autonomous system number for same network devices-->

   R1(config-router)#network 192.168.0.0

   R1(config-router)#network 192.168.0.1 0.0.0.3      <!--Note: Used to specify a subnet using the wildcard mask-->

   Setting up a Vlan using switches:

   Switch1:

      Fa 1 -> Vlan 1

      Fa 2 -> Vlan 2

   Switch 2:

      Fa 1 -> Vlan 3

      Fa 2 -> Vlan 2

   Switch1#conf t

   Switch1(config)#vlan 1

   Switch1(config-vlan)#name Writers

   Switch1(config-vlan)#exit

   Switch1(config)#vlan 2

   Switch1(config-vlan)#name Editors

   Switch1(config-vlan)#exit

   Switch1(config)#int fa 1

   Switch1(config-int)#switchport mode access

   Switch1(config-int)#switchport access vlan 1

   Switch1(config-int)#exit

   Switch1(config)#int  fa 2

   Switch1(config-int)#switchport mode access

   Switch1(config-int)#switchport access vlan 2

   Switch1(config-int)#exit

   Switch1(config)#int fa 12

   Switch1(config-int)#switchport mode trunk

   Switch1(config-int)#switchport trunk encapsulation trunk1

   Switch1(config-int)#exit

   Switch2#conf t

   Switch2(config)#vlan 2

   Switch2(config-vlan)#name Editors

   Switch2(config-vlan)#exit

   Switch2(config)#vlan 3

   Switch2(config-vlan)#name Proofreaders

   Switch2(config-vlan)#exit

   Switch2(config)#int fa 1

   Switch2(config-int)#switchport mode access

   Switch2(config-int)#switchport access vlan3

   Switch2(config-int)#exit

   Switch2(config)#int  fa 2

   Switch2(config-int)#switchport mode access

   Switch2(config-int)#switchport access vlan 2

   Switch2(config-int)#exit

   Switch2(config)#int fa 12

   Switch2(config-int)#switchport mode trunk

   Switch2(config-int)#switchport trunk encapsulation trunk1

   Switch2(config-int)#exit