System Management
Basic System Configuration Guide 419
Description This command instructs the system where to write the file. The name of the file is: dhcp-persistence.db.
On boot the system scans the file systems looking for dhcp-persistence.db, if it finds it starts to load it.
In the subscriber management context, the location specifies the flash device on a CPM card where the
data for handling subscriber management persistency is stored.
The no form of this command returns the system to the default. If there is a change in file location while
persistence is running, a new file will be written on the new flash, and then the old file will be removed.
Default no location
PTP Commands
Note: The commands described in this section apply only to the 7450 ESS and 7750 SR.
ptp
Syntax ptp
Context config>system
Description This command enables the context to configure parameters for IEEE 1588-2008, Precision Time
Protocol.
This command is only available on the control assemblies that support 1588.
shutdown
Syntax [no] shutdown
Context config>system>ptp
Description This command disables or enables the PTP protocol. If PTP is disabled, the router will not transmit any
PTP packets, and will ignore all received PTP packets. If the user attempts execute a no shutdown
command on hardware that does not support PTP, an alarm will be raised to indicate limited
capabilities.
When PTP is shutdown, the PTP slave port is not operational. It shall not be considered as a source for
system timing.
On assemblies supporting a 1 PPS output interface, this command controls the presentation of a signal
on that interface. When PTP is enabled, the 1 PPS port is enabled, and it generates a pulse whose rising
edge represented the second rollover of the internal PTP time scale (that is, whenever the fractional
second of the time is exactly zero). When PTP is disabled, no signal is presented on the 1 PPS interface.
Default shutdown
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