show ip interface is a Cisco IOS command for viewing detailed IP configuration and operational information about router interfaces. Use it after configuring an interface to inspect its state, IPv4 address, broadcast address, address source, and MTU. section 7.3.2 section 7.4
The output identifies important interface details:
- Interface state: reports whether the interface and line protocol are up. section 7.3.2
- IPv4 addressing: displays the Internet address in prefix notation, such as 192.168.1.1/24. section 7.3.2 section 7.4
- Additional settings: shows the broadcast address, how the address was determined, and the MTU. section 7.3.2
Checking configured router interfaces
R1# show ip interface GigabitEthernet0/0 is up, line protocol is up Internet address is 192.168.1.1/24 Broadcast address is 255.255.255.255 Address determined by setup command MTU is 1500 bytes . . . GigabitEthernet0/1 is up, line protocol is up Internet address is 192.168.2.1/24 Broadcast address is 255.255.255.255 Address determined by setup command MTU is 1500 bytes Use show ip interface brief for a quicker overview of interfaces and their status; use show ip interface [interface-name] when more detail is needed. section 7.3.2 section 7.4
R1# show ip interface #1 GigabitEthernet0/0 is up, line protocol is up #2 Internet address is 192.168.1.1/24 #2 Broadcast address is 255.255.255.255 #2 Address determined by setup command #2 MTU is 1500 bytes #2 . . . GigabitEthernet0/1 is up, line protocol is up #3 Internet address is 192.168.2.1/24 #3 Broadcast address is 255.255.255.255 #3 Address determined by setup command #3 MTU is 1500 bytes #3 . . . #1 Views more detailed information about R1’s interfaces #2 Information about G0/0 #3 Information about G0/1
Inspect the annotated command output for detailed information about R1’s G0/0 and G0/1 interfaces. section 7.3.2
