System Management
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Basic System Configuration Guide
3HE 11010 AAAC TQZZA Edition: 01
6.3.3 Persistence
The persistence feature allows lease information on DHCP servers to be kept across
reboots. This information can include data such as the IP address, MAC binding
information, and lease length information.
The system performs the following tasks to make data persistent. In systems with
only one CSM, only task 1 applies. In systems with dual CSMs, both tasks apply.
1. When a DHCP ACK is received from a DHCP server, the entry information is
written to the active CSM compact flash. If persistence fails completely (bad
cflash), a trap is generated indicating that persistence can no longer be
guaranteed.
2. DHCP message information is sent to the standby CSM, and the DHCP
information is also written to the compact flash. If persistence fails on the
standby CSM also, a trap is generated.
6.3.4 Administrative Tasks
This section contains information to perform administrative tasks:
• Saving Configurations
• Specifying Post-Boot Configuration Files
6.3.4.1 Saving Configurations
Whenever configuration changes are made, the modified configuration must be
saved so that it will not be lost when the system is rebooted.
Configuration files are saved by executing explicit command syntax that includes the
file URL location to save the configuration file as well as options to save both default
and non-default configuration parameters. Boot option file (BOF) parameters specify
where the system should search for configuration and image files as well as other
operational parameters during system initialization.
For more information about boot option files, see the chapter on Boot Options in this
guide.
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