IP address Command on CISCO Router/Switch

Command

IP address

Use

This command is used to set IP addresses on an interface.

Syntax

R1(config)#ip address <IP address> <subnet mask> <secondary>

Options

<IP address> IP address for the interface
<subnet mask> IP address for the interface
<secondary> Sets the IP address as a secondary IP address, you can have many secondary IP addresses on an interface if required. Though some routing protocols do not function properly with secondary addresses.

Example

In this example, we set the ip address of int fa0/0 on R2.

R2(config)#int fa0/0
R2(config-if)#ip add 10.1.1.2 255.255.255.0
R2(config-if)#do sh ip int brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 10.1.1.2 YES NVRAM up up

Next, to test it out, we do a quick ping to the new ip address.

R2(config-if)#ip add 11.22.33.44 255.255.255.240 secondary

R2(config-if)#do ping 11.22.33.44

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 11.22.33.44, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/4 ms
R2(config-if)#

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