Cisco IOS
Cisco had the name first. It's the family of operating systems running on their routers and switches.
Note
All listed commands begin with a prompt. The prompt is not actually part of the command, and should not be typed out. All prompts end with # or >. The former indicates privileged access. In more specific modes, the mode will be listed between the device name and the prompt end (e.g. SW0(config)#)
Gain privileged access
SW0>enable
SW0#
Enter configuration mode
SW0#configure terminal
SW0(config)#
Create VLAN
For a VLAN #100 with the name VLANNAME100, run the following:
SW0(config)#vlan 100
SW0(config-vlan)#name VLANNAME100
SW0(config-vlan)#exit
Edit a range of interfaces
To run the same commands for FastEthernet 0/2, FastEthernet 0/3, and FastEthernet 0/4, run the following:
SW0(config)#interface range FastEthernet 0/2-4
SW0(config-if-range)#
Configure an access port
To set FastEthernet 0/4 to use VLAN 120, run the following:
SW0(config)#interface FastEthernet 0/4
SW0(config-if)#switchport access vlan 120
Configure a trunk port
To set up FastEthernet 0/1 as a trunk port, run the following:
SW0(config)#interface FastEthernet 0/1
SW0(config-if)#switchport mode trunk
Enable Routing on a Multi Layer Switch
SW0(config)#ip routing
Enable and Configure OSPF
OSPF requires each router to advertise connected networks to other routers. You can get a router R0 to advertise the networks 192.168.0.0/23, 192.168.2.0/24, and 192.168.3.0/24 to OSPF area 0 with process #1 with the following:
R0(config)#router ospf 1
R0(config-router)#network 192.168.0.0 0.0.1.255 area 0
R0(config-router)#network 192.168.2.0 0.0.0.255 area 0
R0(config-router)#network 192.168.3.0 0.0.0.255 area 0
Static NAT
To set up a router R0 to make the server 10.0.1.113 publicly accessible as 203.0.113.102, do the following:
R0(config)#interface FastEthernet 0/0
R0(config-if)#ip address 20.0.113.101 255.255.255.0
R0(config-if)#no shutdown
R0(config-if)#ip nat outside
R0(config-if)#exit
R0(config)#
R0(config)#interface FastEthernet 0/1
R0(config-if)#ip address 10.0.1.65 255.255.255.192
R0(config-if)#no shutdown
R0(config-if)#ip nat inside
R0(config-if)#exit
R0(config)#
R0(config)#ip nat inside source static 10.0.1.113 203.0.113.102
Port Address Translation
Setup is similar to above
To configure PAT for addresses in the network 192.168.0.0/16 (connected to GigabitEthernet 0/0) to public addresses 198.51.100.10 through 192.51.100.15 (via GigabitEthernet 0/1), do the following:
R0(config)#interface GigabitEthernet 0/0
R0(config-if)#ip nat inside
R0(config-if)#exit
R0(config)#interface GigabitEthernet 0/1
R0(config-if)#ip nat inside
R0(config-if)#exit
R0(config)#ip nat pool users 198.51.100.10 198.51.100.15 netmask 255.255.255.0
R0(config)#access-list 1 permit 192.168.0.0 0.0.255.255
R0(config)#ip nat inside source list 1 pool users overload
BGP
Set up communication
To establish a router on Autonomous System 1234 with the IP address 198.51.100.22 and a rounter on Autonomous System 1111 with the IP address 198.51.100.23 as neighbors, run the following:
ON 1234
R1234(config)#router bgp 1234
R1234(config-router)#neighbor 198.51.100.23 remote-as 1111
ON 1111
R1111(config)#router bgp 1111
R1111(config-router)#neighbor 198.51.100.22 remote-as 1234
Advertise a network
To get R1111 to advertise the 192.0.2.0/24 network to its neighbors, run the following:
R111(config-router)#network 192.0.2.0 mask 255.255.255.0