Basic System Configuration Guide System Management
Edition: 01 3HE 11010 AAAC TQZZA 391
This value also defines the interval between executions of the BMCA within the node. In order
to minimize BMCA-driven reconfigurations, the IEEE Std 1588-2008 recommends that the
announce interval be consistent across the entire IEEE 1588 network.
The announce message interval cannot be changed unless PTP is shut down.
The log-anno-interval is calculated using the binary logarithm of the value of the interval in
seconds before message reception. For example, for an announce message interval of 8
packets/s (one packet every 0.125 seconds), set this field to log(base2) (0.125) = –3.
The no form of this command returns the configuration to the default value. The default value
varies depending on the configuration of the profile command.
Default 1 (1 packet every 2 s) when the profile is configured as ieee1588-2008
1 (1 packet every 2 s) when the profile is configured as itu-telecom-freq for a clock-id of 1 to
16 (profile itu-telecom-freq does not apply when the clock-id is csm)
–3 (8 packets/s) when the profile is configured as g8275dot1-2014
Parameters log-anno-interval — specifies the expected interval between the reception of announce
messages. This parameter is specified as the logarithm to the base 2, in seconds.
Values –3 to 4, where –3 = 0.125 s, –2 = 0.25 s, –1 = 0.5 s, 0 = 1 s, 1 = 2 s,
2 = 4 s, 3 = 8 s, and 4 = 16 s when the clock-id is 1 to 16 (all profiles)
or when the clock-id is csm and the profile is configured as
ieee1588-2008 or g8275dot1-2014 (profile itu-telecom-freq does
not apply when the clock-id is csm)
network-type
Syntax network-type {sdh | sonet}
no network-type
Context config>system>ptp>clock
Description This command configures whether to use SDH or SONET values for encoding synchronous
status messages. This command only applies to synchronous Ethernet ports and is not
configurable on SONET/SDH ports.
This command is only available when the clock-id parameter is defined as csm.
Default sdh
Parameters sdh — specifies the values used are as defined in ITU-T G.781 Option 1
sonet — specifies the values used are as defined in ITU-T G.781 Option 2
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