
Configuring IP Addressing
IP Preserve: Retaining VLAN-1 IP Addressing Across Configuration File Downloads
Note Designating a primary VLAN other than the default VLAN affects the switch’s
use of information received via DHCP/Bootp. For more on this topic, refer to
the chapter describing VLANs in the Advanced Traffic Management Guide
for your switch.
After you reconfigure or reboot the switch with DHCP/Bootp enabled in a
network providing DHCP/Bootp service, the switch does the following:
■ Receives an IP address and subnet mask and, if configured in the server,
a gateway IP address and the address of a Timep server.
■ If the DHCP/Bootp reply provides information for downloading a config-
uration file, the switch uses TFTP to download the file from the designated
source, then reboots itself. (This assumes that the switch or VLAN has
connectivity to the TFTP file server specified in the reply, that the config-
uration file is correctly named, and that the configuration file exists in the
TFTP directory.)
IP Preserve: Retaining VLAN-1 IP
Addressing Across Configuration File
Downloads
IP Preserve enables you to copy a configuration file to multiple Series 5300XL
switches while retaining the individual IP address and subnet mask on VLAN
1 in each switch, and the Gateway IP address assigned to the switch. This
enables you to distribute the same configuration file to multiple switches
without overwriting their individual IP addresses.
Operating Rules for IP Preserve
When ip preserve is entered as the last line in a configuration file stored on a
TFTP server:
■ If the switch’s current IP address for VLAN 1 was not configured by DHCP/
Bootp, IP Preserve retains the switch’s current IP address, subnet mask,
and IP gateway address when the switch downloads the file and reboots.
The switch adopts all other configuration parameters in the configuration
file into the startup-config file.
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