HP ProCurve 6400cl Series Management And Configuration Manual page 164

Configuring IP Addressing
IP Preserve: Retaining VLAN-1 IP Addressing Across Configuration File Downloads
TFTP
Server
config.
Switch 1
VLAN 1:
10.31.22.101
Switches 1 through 3 copy and implement the config.txt file
from the TFTP server (figure 8-8), but retain their current IP
Figure 8-7. Example of IP Preserve Operation with Multiple Series Switches
Figure 8-8. Configuration File in TFTP Server, with DHCP/Bootp Specified as the IP Addressing Source
8-18
For example, consider Figure 8-7:
Switch 2
VLAN 1:
10.31.22.102
If you apply the following configuration file to figure 8-7, switches 1 - 3 will
retain their manually assigned IP addressing and switch 4 will be configured
to acquire its IP addressing from a DHCP server.
IP Preserve Command
Management
Station
Switch 3
VLAN 1:
10.31.22.103
Switch 4 also copies and implements the
config.txt file from the TFTP server (figure 8-8), but
acquires new IP addressing from the DHCP
Using figure 8-7, above, switches 1 - 3 ignore these
entries because the file implements IP Preserve and
their current IP addressing was not acquired through
DHCP/Bootp.
Switch 4 ignores IP Preserve and implements the
DHCP/Bootp addressing and IP Gateway specified in
this file (because its last IP addressing was acquired
from a DHCP/Bootp server).
DHCP
Server
IP
Address
Switch 4
VLAN 1: DHCP