ip address Command

Use the following command to add addresses to or delete addresses from an interface:

ip address

Use to add a primary address or to add secondary addresses to an interface.
To add multiple addresses to a single IP interface, use the secondary keyword. (Remember, if you add an address using the ip address command and do not include the secondary keyword, the new address becomes the primary address.)
You can specify the subnetwork mask value in either dotted decimal or prefix length notation.
Example—Adds a primary address (192.168.2.77) and two secondary addresses (172.31.7.22 and 10.8.7.22); the Fast Ethernet interface now has addresses in three networks.host1(config)#interface fastEthernet 0/0 host1(config-if)#ip address 192.168.2.77 255.255.255.0 host1(config-if)#ip address 172.31.7.22 255.255.255.0 secondary host1(config-if)#ip address 10.8.7.22 255.255.255.0 secondary

Note: You can use this command in Interface Configuration mode, Subinterface Configuration mode, or Profile Configuration mode.
Use the no version to remove an IP address. If you remove a primary IP address, IP processing is disabled on the interface.
See ip address