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Starting and Configuring the Device
Advanced Configuration
Page 39
Advanced Configuration
This section provides information about dynamic allocation of IP addresses and security management based on
the authentication, authorization, and accounting (AAA) mechanism, and includes the following topics:
• Receiving an IP Address from a DHCP Server
• Receiving an IP Address from a BOOTP Server
• Security Management and Password Configuration
When configuring or receiving IP addresses through DHCP and BOOTP, the configuration received from these
servers includes the IP address, and may include a subnet mask and default gateway.
Receiving an IP Address from a DHCP Server
When using the DHCP protocol to retrieve an IP address, the device acts as a DHCP client. To receive an IP
address from a DHCP server, perform the following steps:
1. Select and connect any port to a DHCP server or to a subnet that has a DHCP server on it, in order to retrieve
the IP address.
2. Enter the following commands to use the selected port for receiving the IP address. In the following example,
the commands are based on the port type used for configuration.
console# configure
console(config)# interface ethernet 1
console(config-if)# ip address dhcp hostname admin-host
console(config-if)# exit
console(config)#
3. To verify the IP address, enter the show ip interface command at the system prompt as shown in the
following example.
console#
show ip interface
IP Address I/F Type
--------------- ---------- ---------
100.1.1.1/24 vlan 1 dynamic
Notes
• The device configuration does not have to be deleted to retrieve an IP address for the DHCP server.
• When copying configuration files, avoid using a configuration file that contains an instruction to
enable DHCP on an interface that connects to the same DHCP server, or to one with an identical con-
figuration. As a result of the copying configuration, the switch retrieves the new configuration file and
boots from it. The device then enables DHCP as instructed in the new configuration file, and the
DHCP instructs it to reload the same file.
Receiving an IP Address from a BOOTP Server
The standard BOOTP protocol is supported and enables the switch to automatically download its IP host
configuration from any standard BOOTP server in the network. In this case, the device acts as a BOOTP client.
To receive an IP address from a BOOTP server:
1. Select and connect any port to a BOOTP server or subnet containing such a server.
2. At the system prompt, enter the delete startup configuration command to delete the startup configuration
from flash.