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. Requests will be sen t pe riod ical ly in a n
effort to obtain IP configuration information. BOOTP and DHCP values can include
the IP address, subnet mask, and default gateway. If the DHCP/BOOTP server is
slow to respond, you may need to use the “ip dh cp res tart client ” comm and to
re-start broadcasting service requests.
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 powere d on.
To automatically configure the switch by communicating with BOOTP or DHC P
address allocation servers on the network, complete the foll owing st eps:
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 dh cp” 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 client” to begin broadcasting service re quests.
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 run ning-conf ig
startup-config.” Enter the startup file name and press <Enter>.
Console(config)#interface vlan 1 27-1
Console(config-if)#ip address dhcp 41-3
Console(config-if)#end
Console#ip dhcp restart client 39-2
Console#show ip interface 41-5
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 23-11
Startup configuration file name []: startup
\Write to FLASH Programming.
\Write to FLASH finish.
Success.
2-11
Basic Configuration
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