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Enhancements in Release F.04.08
IP Preserve: Retaining VLAN-1 IP Addressing Across Configuration File Downloads
IP Preserve: Retaining VLAN-1 IP Addressing Across
Configuration File Downloads
IP Preserve enables you to copy a configuration file to multiple Series 2500 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.
■ If the switch’s current IP addressing for VLAN 1 is from a DHCP server, IP Preserve is
suspended. In this case, whatever IP addressing the configuration file specifies is imple-
mented when the switch downloads the file and reboots. If the file includes DHCP/Bootp as
the IP addressing source for VLAN 1, the switch will configure itself accordingly and use
DHCP/Bootp. If instead, the file includes a dedicated IP address and subnet mask for VLAN
1 and a specific gateway IP address, then the switch will implement these settings in the
startup-config file.
■ The ip preserve statement does not appear in show config listings. To verify IP Preserve in a
configuration file, open the file in a text editor and view the last line. For an example of
implementing IP Preserve in a configuration file, see figure 59, below.
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).
Figure 59. Example of Implementing IP Preserve in a Configuration File
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.