System Management
398
Basic System Configuration Guide
3HE 11010 AAAC TQZZA Edition: 01
The no form of this command disables unicast-negotiate. In this case, the user must specify
the slave clock information when configuring the 7705 SAR master node in order for
communication between the slave clock and master clock to take place.
Default unicast-negotiate
source-interface
Syntax source-interface ip-if-name
no source-interface
Context config>system>ptp>clock
Description This command defines the IP interface that provides the IEEE 1588 packets to the clock
recovery mechanism on the adapter card or port. The interface must be PTP-enabled.
This command only applies when the clock-id parameter value is 1 to 16.
If the ip-if-name refers to a loopback or system address, then the remote peer must send
packets to ingress on this particular loopback or system address. If the ip-if-name refers to
an interface that is associated with a physical port or VLAN, then the remote peer must send
packets to ingress on this particular IP interface.
Default n/a
Parameters ip-if-name — specifies the IP interface used by the PTP slave clock
tx-while-sync-uncertain
Syntax [no] tx-while-sync-uncertain
Context config>system>ptp>clock
Description This command enables or disables the transmission of Announce messages to downstream
clocks if the PTP network has not yet stabilized. In some cases, it may be important for a
downstream boundary clock or slave clock to know whether the PTP network has stabilized
or is still “synchronization uncertain”.
To indicate the synchronization certainty state, the synchronizationUncertain flag in the
Announce message is set to TRUE if the clock is in a “synchronization uncertain” state and
is set to FALSE if the clock is in a “synchronization certain” state.
However, because the synchronizationUncertain flag is newly agreed upon in standards,
most base station slave clocks do not look at this bit. Therefore, in order to ensure that the
downstream clocks are aware of the state of the network, the PTP clock may be configured
to transmit Announce and Sync messages only if the clock is in a “synchronization certain”
state. This is done using the no form of this command.
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