General Configuration
Hostname
R1(config)#hostname <hostname>
Console Password
R1(config)#line con 0
R1(config)#password <password>
R1(config)#login
VTY Password
R1(config)#line vty <range>
R1(config)#password <password>
R1(config)#login
Password Encryption
R1(config)#service password-encryption
Message of the Day
R1(config)#banner motd #message#
Login
R1(config)#banner login #message#
Disable IP Domain Lookup
R1(config)#no ip domain-lookup
Interface Configuration
Set IP Address
R1(config)#interface {s0/0/0 | fa 0/0 | g0/0}
R1(config-if)#ip address <ip address> <subnet>
Enable Clocking
R1(config-if)#clock rate <clock rate>
Description
R1(config-if)#description <description>
Enable Interface
R1(config-if)#no shutdown
Loopback Addresses
R1(config)#interface loopback <interface number>
Routing
Enable Static Routes
R1(config)#route <ip address> <subnet mask> <exit interface>
or
R1(config)#route <ip address> <subnet mask> <next hop address>
Default Routes
R1(config)# route 0.0.0.0 0.0.0.0 <next hop address> <exit interface>
Dynamic Routes Using Routing Protocols
RIPV1
Enable RIP
R1(config)#router rip
Set Networks
R1(config-rip)#network <network>
NOTE: Networks must be summarised according to class; if not RIP will do this automatically. Further note that only DIRECTLY CONNECTED networks need to be added.
Passive Interfaces
R1(config-if)#passive-interface
OSPF
Enable OSPF
R1(config)#router ospf <process id>
NOTE: Process ID is a number between 1 & 65535 and is chosen by the network administrator.
Set Networks
R1(config)#router ospf <process id>
R1(config-router)#network <network> <wildcard mask> area <area id>
Router ID
R1(config)#router ospf <process id>
R1(config-router)#router id <ip address>
NOTE:If Router ID is configured after network command, use following to clear default ID.
Clear Default Router ID
R1#clear ip ospf process
or
Reload router after entering new Router ID.
Modifying Cost
R1(config)#interface <interface>
R1(config-if)#bandwidth <bandwidth - kbps>
or
R1(config-if)#ip ospf cost <cost>
Interface Priority
R1(config-if)#ip ospf priority {0-255}
Redistributing Default Routes
R1(config-if)#default-information originate
Adjust Reference Bandwidth
R1(config-router)#auto-cost reference-bandwidth <reference>
ie
| Mbps | 100 |
| GB | 1000 |
| 10 GigE | 10000 |
Modifying Hello Intervals
R1(config-if)#ip ospf hello-interval <seconds>
Modifying Dead Intervals
R1(config-if)#ip aspf deaf-interval <seconds>
NOTE: Dead Interval should be 4 x Hello Interval.
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