Basic System Configuration Guide Boot Options
Edition: 01 3HE 11010 AAAC TQZZA 177
5.13.2.1.4 Image and Configuration Management Commands
persist
Syntax persist {on | off}
Context bof
Description This command specifies whether the system will preserve system indexes when a save
command is executed. During a subsequent boot, the index file is read along with the
configuration file. As a result, a number of system indexes are preserved between reboots,
including the interface index, LSP IDs, and path IDs. This reduces resynchronizations of the
Network Management System (NMS) with the affected network element.
In the event that persist is on and the reboot with the appropriate index file fails, SNMP is
operationally shut down to prevent the management system from accessing and possibly
synchronizing with a partially booted or incomplete network element. To enable SNMP
access, enter the config>system>snmp>no shutdown command.
If persist is enabled and the admin save <url> command is executed with an FTP path used
as the <url> parameter, two FTP sessions simultaneously open to the FTP server. The FTP
server must be configured to allow multiple sessions from the same login; otherwise, the
configuration and index files will not be saved correctly.
Default off
Parameters on — preserves the system index when saving the configuration
off — disables the system index saves between reboots
Note:
• Persistency files (.pst) should not be saved on the same disk as the configuration files
and the image files.
• When an operator sets the location for the persistency file, the system checks to
ensure that the disk has enough free space. If there is not enough free space, the
persistency will not become active and a trap is generated. The operator must free up
adequate disk space before persistency will become active. The system performs a
space availability check every 30 seconds. As soon as the space is available the
persistency becomes active on the next 30-second check.
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