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Initial Configuration
2-8
2
Dynamic Configuration
Obtaining an IPv4 Address
If you select the “bootp” or “dhcp” option, IP will be enabled but will not function until
a BOOTP or DHCP reply has been received. You therefore need to use the “ip dhcp
restart” command to start broadcasting service requests. Requests will be sent
periodically in an effort to obtain IP configuration information. (BOOTP and DHCP
values can include the IP address, subnet mask, and default gateway.)
If the “bootp” or “dhcp” option is saved to the startup-config file (step 6), then the
switch will start broadcasting service requests as soon as it is powered on.
To automatically configure the switch by communicating with BOOTP or DHCP
address allocation servers on the network, complete the following steps:
1. From the Global Configuration mode prompt, type “interface vlan 1” to access
the interface-configuration mode. Press <Enter>.
2. At the interface-configuration mode prompt, use one of the following commands:
• To obtain IP settings via DHCP, type “ip address dhcp” and press <Enter>.
• To obtain IP settings via BOOTP, type “ip address bootp” and press <Enter>.
3. Type “end” to return to the Privileged Exec mode. Press <Enter>.
4. Type “ip dhcp restart” to begin broadcasting service requests. Press <Enter>.
5. Wait a few minutes, and then check the IP configuration settings by typing the
“show ip interface” command. Press <Enter>.
6. Then save your configuration changes by typing “copy running-config
startup-config.” Enter the startup file name and press <Enter>.
Console(config)#interface vlan 1 45-1
Console(config-if)#ip address dhcp 59-1
Console(config-if)#end
Console#ip dhcp restart 59-3
Console#show ip interface 59-4
IP address and netmask: 192.168.1.54 255.255.255.0 on VLAN 1,
and address mode: DHCP
Console#copy running-config startup-config 35-2
Startup configuration file name []: startup
\Write to FLASH Programming.
\Write to FLASH finish.
Success.