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Enhancements in Release F.04.08
IP Preserve: Retaining VLAN-1 IP Addressing Across Configuration File Downloads
For example, consider Figure 60:
Figure 60. Example of IP Preserve Operation
If you apply the following configuration file to Figure 60, 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.
Figure 61. Configuration File in TFTP Server, with DHCP/Bootp Specified as the IP Addressing Source
Switch 4
VLAN 1: DHCP
Switch 3
VLAN 1: 10.31.22.103
(Manually configured)
Switch 1
VLAN 1: 10.31.22.101
(Manually configured)
DHCP
Server
Switch 2
VLAN 1: 10.31.22.102
(Manually configured)
config.txt IP Address
to VLAN 1
Switches 1 through 3 copy and implement the config.txt file from
the TFTP server (figure 61), but retain their current IP addresses.
Switch 4 also copies and implements the config.txt
file from the TFTP server (figure 61), but acquires
new IP addressing from the DHCP server.
TFTP
Server
Management
Station
Using figure 60, 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).
IP Preserve Command