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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
OL-10101-02
Chapter 4 Assigning the Switch IP Address and Default Gateway
Checking and Saving the Running Configuration
Note You should only configure and enable the Layer 3 interface. Do not assign an IP address or DHCP-based
autoconfiguration with a saved configuration will not work.
Manually Assigning IP Information
Beginning in privileged EXEC mode, follow these steps to manually assign IP information to VLANs:
To remove the switch IP address, use the no ip address interface configuration command. If you are
removing the address through a Telnet session, your connection to the switch will be lost. To remove the
default gateway address, use the no ip default-gateway global configuration command.
For information on setting the switch system name, protecting access to privileged EXEC commands,
and setting time and calendar services, see
Chapter 7, “Administering the Switch.”
Checking and Saving the Running Configuration
You can check the configuration settings you entered or changes that you made by entering the show
running-config privileged EXEC command: For information about the output of this command, see the
Cisco IOS Configuration Fundamental Command Reference for Release 12.1.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface vlan vlan-id Enter interface configuration mode, and enter the VLAN to which the IP
information is assigned. The range is 1 to 4094 when the enhanced
software image is installed and 1 to 1001 when the standard software
image is installed.
Step 3
ip address ip-address subnet-mask Enter the IP address and subnet mask.
Step 4
exit Return to global configuration mode.
Step 5
ip default-gateway ip-address Enter the IP address of the next-hop router interface that is directly
connected to the switch where a default gateway is being configured. The
default gateway receives IP packets with unresolved destination IP
addresses from the switch.
Once the default gateway is configured, the switch has connectivity to the
remote networks with which a host needs to communicate.
Note When your switch is configured to route with IP, it does not need
to have a default gateway set.
Step 6
end Return to privileged EXEC mode.
Step 7
show interfaces vlan vlan-id Verify the configured IP address.
Step 8
show ip redirects Verify the configured default gateway.
Step 9
copy running-config startup-config (Optional) Save your entries in the configuration file.