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Configuring IP Unicast Routing
Configuring IP Addressing
DETAILED STEPS
EXAMPLE
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface gi0/2
Switch(config-if)# no switchport
Switch(config-if)# ip address 10.1.5.1 255.255.255.0
Switch(config-if)# end
Enabling Subnet Zero
Enabling subnet zero provides the ability to configure and route to subnet 0 subnets.
You can use the all ones subnet (131.108.255.0) and even though it is discouraged, you can enable the use of subnet
zero if you need the entire subnet space for your IP address.
BEFORE YOU BEGIN
Subnetting with a subnet address of zero is strongly discouraged because of the problems that can arise if a network
and a subnet have the same addresses. For example, if network 131.108.0.0 is subnetted as 255.255.255.0, subnet zero
would be written as 131.108.0.0, which is the same as the network address.
Command Purpose
1. configure terminal Enter global configuration mode.
2. interface interface-id Enter interface configuration mode, and specify the
Layer 3 interface to configure.
3. no shutdown Enable the interface if necessary. User network
interfaces (UNIs) and enhanced network interfaces
(ENIs) are disabled by default; network node interfaces
(NNIs) are enabled by default.
4. no switchport Remove the interface from Layer 2 configuration mode
(if it is a physical interface).
5. ip address ip-address subnet-mask Configure the IP address and IP subnet mask.
6. end Return to privileged EXEC mode.
7. show interfaces [interface-id]
show ip interface [interface-id]
show running-config interface
[interface-id]
Verify your entries.
8. copy running-config startup-config (Optional) Save your entries in the configuration file.
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