HP 6120 Enabling IP Preserve, ip preserve, Figure 8-6.Example of Implementing IP Preserve in a Configuration File

Configuring IP Addressing

IP Preserve: Retaining VLAN-1 IP Addressing Across Configuration File Downloads

Enabling IP Preserve

To set up IP Preserve, enter the ip preserve statement at the end of a configuration file. (Note that you do not execute IP Preserve by entering a command from the CLI).

Entering “ip preserve” in the last line of a configuration file implements IP Preserve when the file is downloaded to the switch and the switch reboots.

Figure 8-6. Example of Implementing IP Preserve in a Configuration File

For example, consider Figure 8-7:

	TFTP				DHCP
Server					Server
		Management
config.					IP
			Station
				Address

Switch 1	Switch 2	Switch 3	Switch 4
VLAN 1:	VLAN 1:	VLAN 1:	VLAN 1: DHCP
10.31.22.101	10.31.22.102	10.31.22.103

Switches 1 through 3 copy and implement the config.txt file from the TFTP server (figure 8-8), but retain their current IP

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

Figure 8-7. Example of IP Preserve Operation with Multiple Series Switches

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.

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