802.1AS Timesync Commands

This section describes the commands you use for timing and synchronization. Each node of the network must be synchronous to other nodes. Synchronization network provides reference timing signals of required quality to all types of telecommunication traffic networks. Poor synchronization results in loss of information which can be avoided by properly connecting the traffic network to an adequate synchronization network.

dot1as (Global Config)

Use the dot1as command in Global Configuration mode to set the 802.1AS operational mode to enabled.

• Default: enabled
• Format: dot1as
• Mode: Global Config

no dot1as

Use the no dot1as command in Global Configuration mode to set the 802.1AS operational mode to disabled. While disabled, the 802.1AS configuration is retained and can be changed, but is not activated.

• Format: no dot1as
• Mode: Global Config

dot1as (Interface Config)

Use the dot1as command in Interface Configuration mode to set the 802.1AS operational mode for this port to enabled.

• Default: enabled
• Format: dot1as
• Mode: Interface Config

no dot1as

Use the no dot1as command in Interface Configuration mode to set the 802.1AS operational mode for this port to disabled.

• Format: dot1as
• Mode: Interface Config

dot1as priority

Use the dot1as priority command in Global Configuration mode to configure the 802.1AS priority1 or priority2 values.

• Default: 246/248
• Format: dot1as priority 1–2 0–255
• Mode: Global Config

no dot1as priority

Use the no dot1as priority command in Global Configuration mode to set the 802.1AS priority1 or priority2 value to the default.

• Format: no dot1as priority 1–2
• Mode: Global Config

dot1as interval announce

Use the dot1as interval announce command in Interface Configuration mode to configure the initial mean time interval between successive ANNOUNCE messages in logarithm to base 2 format.

• Default: 0
• Format: dot1as interval announce –5 to 5
• Mode: Interface Config

no dot1as interval announce

Use the no dot1as interval announce command in Interface Configuration mode to set the initial mean time interval between successive ANNOUNCE messages to the default value.

• Format: no dot1as interval announce
• Mode: Interface Config

dot1as interval sync

Use the dot1as interval sync command in Interface Configuration mode to configure the initial mean time interval between successive SYNC messages in logarithm to base 2 format.

• Default: –3
• Format: dot1as interval sync –5 to 5
• Mode: Interface Config

no dot1as interval sync

Use the no dot1as interval sync command in Interface Configuration mode to set the initial mean time interval between successive SYNC messages to the default value.

• Format: no dot1as interval sync
• Mode: Interface Config

dot1as interval pdelay

Use the dot1as interval pdelay command in Interface Configuration mode to configure the initial mean time interval between successive PDELAY messages in logarithm to base 2 format.

• Default: 0
• Format: dot1as interval pdelay –5 to 5
• Mode: Interface Config

no dot1as interval pdelay

Use the no dot1as interval pdelay command in Interface Configuration mode to set the initial mean time interval between successive PDELAY messages to the default value.

• Format: no dot1as interval pdelay
• Mode: Interface Config

dot1as timeout announce

Use the dot1as timeout announce command in Interface Configuration mode to configure the number of ANNOUNCE intervals that have to pass without receipt of an ANNOUNCE message, before considering that the master is no longer transmitting.

• Default: 3
• Format: dot1as timeout announce 2–255
• Mode: Interface Config

no dot1as timeout announce

Use the no dot1as timeout announce command in Interface Configuration mode to set the ANNOUNCE timeout to the default value.

• Format: no dot1as timeout announce
• Mode: Interface Config

dot1as timeout sync

Use the dot1as timeout sync command in Interface Configuration mode to configure the number of SYNC intervals that have to pass without receipt of a SYNC message, before considering that the master is no longer transmitting.

• Default: 3
• Format: dot1as timeout sync <2–255>
• Mode: Interface Config

no dot1as timeout sync

Use the no dot1as timeout sync command in Interface Configuration mode to set the SYNC timeout to the default value.

dot1as pdelaythreshold

Use the dot1as pdelaythreshold command in Interface Configuration mode to configure the propagation delay threshold in nanoseconds, above which an interface is not considered capable of participating in the 802.1AS protocol.

• Default: 2500
• Format: dot1as pdelaythreshold <0-1000000000>
• Mode: Interface Config

no dot1as pdelaythreshold

Use the dot1as pdelaythreshold command in Interface Configuration mode to set the pdelaythreshold to the default value.

• Format: no dot1as pdelaythreshold
• Mode: Interface Config

dot1as allowedlostresp

Use the dot1as allowedlostresp command in Interface Configuration mode to configure the number of Pdelay_Req messages for which a valid response is not received, above which a port is considered to not be exchanging peer delay messages with its neighbor.

• Default: 3
• Format: dot1as allowedlostresp <0-65535>
• Mode: Interface Config

no dot1as allowedlostresp

Use the no dot1as allowedlostresp command in Interface Configuration mode to set the value of allowed lost PDELAY responses to the default.

• Format: no dot1as allowedlostresp
• Mode: Interface Config

clear dot1as statistics

Use the clear dot1as statistics command in Privileged EXEC mode to clear 802.1AS statistics for a specified port or for all ports.

• Format: clear dot1as statistics {<unit/slot/port>| all}
• Mode: Privileged EXEC

show dot1as summary

Use the show dot1as summary command in Privileged EXEC or User EXEC mode to display a summary of the 802.1AS component.

• Format: show dot1as summary
• Mode:
  • Privileged EXEC
  • User EXEC

The display parameters for above command are:

• 802.1AS Global Admin Mode: Configured value of 802.1AS global admin mode.
• Grandmaster Present: Indicates where a 802.1AS grandmaster is present or not.
• Best Clock Identity: Specifies the clock identity of the 802.1AS grandmaster.
• Best Clock Priority1: Specifies the priority1 value of 802.1AS grandmaster.
• Best Clock Priority2: Specifies the priority2 value of 802.1AS grandmaster.
• Steps to Best Clock: Specifies the number of hops between the local clock and the grandmaster.
• Local Clock Identity: Specifies the clock identity of the local clock.
• Local Clock Priority1: Specifies the priority1 value of 802.1AS local clock.
• Local Clock Priority2: Specifies the priority2 value of local clock.
• Grandmaster Change Count: Specifies the number of GM change events occurred.
• Last Grandmaster Change Timestamp: Specifies the timestamp of the last GM change event.

show dot1as interface

Use the show dot1as interface command in Privileged EXEC or User EXEC mode to display the 802.1AS interface status.

• Format: show dot1as interface {<unit/slot/port> | summary}
• Mode:
  • Privileged EXEC
  • User EXEC

The display parameters for above command are:

• Interface: <unit/slot/port>
• Mode: 802.1AS interface admin mode (enabled/disabled).
• asCapable: Indicates whether interface is asCapable.
• MeasuringPdelay: Indicates whether interface is measuring PDELAY.
• Pdelay: Indicates the value of the propagation delay on this interface.
• Role: Indicates one of the 802.1AS port roles (MASTER, SLAVE, PASSIVE, DISABLED).
• Pdelay Threshold: Specifies the propagation delay threshold in nanoseconds, above which an interface is not considered capable of participating in the 802.1AS protocol.
• Pdelay Lost Responses Allowed: Specifies the number of Pdelay_Req messages for which a valid response is not received, above which a port is considered to not be exchanging peer delay messages with its neighbor.
• Neighbor Rate Ratio: Specifies an estimate of the ratio of the frequency of the LocalClock entity of the time-aware system at the other end of the link attached to this port, to the frequency of the LocalClock entity of this time-aware system.
• Initial Pdelay Interval: Specifies the configured mean time interval between successive PDELAY_REQ messages sent over a link, in logarithm to base 2 format.
• Initial Announce Interval: Specifies the configured mean time interval between successive ANNOUNCE messages in logarithm to base 2 format.
• Initial Sync Interval: Specifies the configured mean time interval between successive SYNC messages, in logarithm to base 2 format.
• Current Pdelay Interval: Specifies the current mean time interval between successive PDELAY_REQ messages sent over a link, in logarithm to base 2 format.
• Current Announce Interval: Specifies the current mean time interval between successive ANNOUNCE messages in logarithm to base 2 format.
• Current Sync Interval: Specifies the current mean time interval between successive SYNC messages, in logarithm to base 2 format.
• Sync Timeout: Specifies the number of SYNC intervals that have to pass without receipt of SYNC information, before considering that the master is no longer transmitting.
• Announce Timeout: Specifies the number of ANNOUNCE intervals that have to pass without receipt of ANNOUNCE PDU, before considering that the master is no longer transmitting.

show dot1as statistics

Use the show dot1as statistics command in Privileged EXEC or User EXEC mode to display the 802.1AS interface statistics.

• Format: show dot1as statistics <unit/slot/port>
• Mode:
  • Privileged EXEC
  • User EXEC