CISCO Router Commands

IP Settings

enable
configure terminal
!
interface fa0/0
ip address 192.168.1.200 255.255.255.0
no shutdown
exit
!
interface fa1/0
ip address 172.16.1.254 255.255.255.0
no shutdown
exit

Multiple VLAN Single Interface

enable
configure terminal
!
interface FastEthernet 0/0
no shutdown
!
interface FastEthernet 0/0.10
encapsulation dot1Q 10
ip address 192.168.1.254 255.255.255.0
!
interface FastEthernet 0/0.20
encapsulation dot1Q 20
ip address 192.168.2.254 255.255.255.0
!
interface FastEthernet 0/0.30
encapsulation dot1Q 30
ip address 192.168.3.254 255.255.255.0
!
exit

Show

enable
!
show ip interface brief
!
show interfaces
show interfaces FastEthernet 0/0
show interfaces Port-channel 1

Loopback

Create

enable
configure terminal
!
interface loopback 1
ip address 172.18.101.9 255.255.255.255
exit
!
interface loopback 2
ip address 10.77.101.5 255.255.254.0
exit

Delete

enable
configure terminal
!
no interface loopback 2
exit

DHCP

enable
configure terminal
!
ip dhcp pool Sales
network 192.168.10.0 255.255.255.0
default-router 192.168.10.1
dns-server 8.8.8.8
lease h m s
exit
!
ip dhcp pool Admin
network 192.168.20.0 255.255.255.0
default-router 192.168.20.1
exit

Show

enable
!
show ip dhcp binding
show ip dhcp conflict
show ip dhcp relay
!
show dhcp lease

Routes

Default

enable
configure terminal
!
ip route 0.0.0.0 0.0.0.0 FastEthernet 0/0

Static

enable
configure terminal
!
ip route 192.168.22.0 255.255.255.0 FastEthernet 0/0 20
ip route 172.30.11.0 255.255.255.0 FastEthernet 0/3 10

Automatic

OSPF

Advertising

Advertise each subnet to be distributed. The subnet needs to exist on the router for the route to be distributed.

router ospf 1
network 192.168.1.0 0.0.0.255 area 0
network 172.16.12.0 0.0.3.255 area 0

Exclude

Exclude an interface from OSPF broadcasts

enable
configure terminal
!
router ospf
passive-interface FastEthernet 0/0

OSPF Static Routes

To distribute static routes. Needs to be completed on each router that has a static route that needs to be part of OSPF.

enable
configure terminal
!
router ospf 1
redistribute static subnets

Hello Interval

All routers must be set the same

ip ospf hello-interval 5

Show

show ip ospf interface
show ip ospf database
show ip ospf neighbor
show ip protocols
show ip ospf interface FastEthernet 3/0

RIP

Router ID

Router ID is the largest IP Address on any interface. The Router with the highest ID will be the master.

There is no need to set this manually.

enable
configure terminal
!
router ospf 1
router-id 192.168.13.254

Advertise

enable
configure terminal
!
router rip
network 192.168.1.0
network 172.30.24.0

Exclude Interface

Disable RIP broadcasts from a particular interface.

enable
configure terminal
!
router rip
passive-interface FastEthernet 3/0

Show

show ip rip database

Disable Domain Lookup

no ip domain lookup