3-6
Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
OL-12247-04
Chapter 3 Assigning the Switch IP Address and Default Gateway
Assigning Switch Information
Note
To enable a DHCP auto-image update on the switch, the TFTP server where the image and configuration
files are located must be configured with the correct option 67 (the configuration filename), option 66
(the DHCP server hostname) option 150 (the TFTP server address), and option 125 (description of the
file) settings.
For procedures to configure the switch as a DHCP server, see the
Autoconfiguration” section on page 3-6
and the “Configuring DHCP” section of the “IP addressing and
Services” section of the
Cisco IOS IP Configuration Guide, Release 12.2
.
After you install the switch in your network, the auto-image update feature starts. The downloaded
configuration file is saved in the running configuration of the switch, and the new image is downloaded
and installed on the switch. When you reboot the switch, the configuration is stored in the saved
configuration on the switch.
Limitations and Restrictions
These are the limitations:
•
The DHCP-based autoconfiguration with a saved configuration process stops if there is not at least
one Layer 3 interface in an up state without an assigned IP address in the network.
•
Unless you configure a timeout, the DHCP-based autoconfiguration with a saved configuration
feature tries indefinitely to download an IP address.
•
The auto-install process stops if a configuration file cannot be downloaded or it the configuration
file is corrupted.
The configuration file that is downloaded from TFTP is merged with the existing configuration in the
running configuration but is not saved in the NVRAM unless you enter the
write memory
or
copy running-configuration startup-configuration
privileged EXEC command. Note that if the
downloaded configuration is saved to the startup configuration, the feature is not triggered during sub-
sequent system restarts.
Configuring DHCP-Based Autoconfiguration
These sections contain this configuration information:
•
DHCP Server Configuration Guidelines, page 3-7
•
Configuring the TFTP Server, page 3-7
•
•
Configuring the Relay Device, page 3-8
•
Obtaining Configuration Files, page 3-9
•
Example Configuration, page 3-10
If your DHCP server is a Cisco device, see the “Configuring DHCP” section of the “IP Addressing and
Services” section of the
Cisco IOS IP Configuration Guide, Release 12.2
for additional information
about configuring DHCP.
