configure network-clock gptp ports peer-delay
Configures gPTP peer delay parameters on the specified ports.
|port_list||Specifies one or more of the switch‘s physical ports.|
|only||Apply change only to specified port, even if port is master of a load sharing group.|
|all||Specifies all of the switch‘s physical ports.|
|lost_responses_value||The number of consecutive Peer Delay RequestPdelay_Req messages that the switch must send on a port without receiving a valid response before it considers the port not to be exchanging Peer Delay messages with its neighbor.|
|log_2_interval||The interval between Peer Delay RequestPdelay_Req messages sent by the switch on the port when the port is initialized or when the switch receives on the port a message interval request TLV with linkDelayInterval value of 126. This value is in log2 seconds. The valid range of values is -3 (2-3 = 0.125 seconds) to 17 (217 = 131072 seconds).|
|asymmetry_time||The time that the propagation delay from
this switch to the neighbor is less than the estimated one-way
propagation delay between the switch and its neighbor (which is also
the time that the propagation delay from the neighbor to this switch
is greater than the estimate). This value is negative if the
propagation delay to the neighbor is greater than the estimate. It
can be in nanoseconds, microseconds, milliseconds, or seconds. The
maximum value is 4,294,967,295 nanoseconds (approximately 4.3
seconds). Let tIR be the propagation delay from this switch
(initiator) to the neighbor (responder), tRI be the propagation
delay from the neighbor to this switch, and meanPathDelay be the
estimated one-way propagation delay. Then:
|neighbor_thresh_time||The maximum measured mean of the propagation delay between this switch and the neighbor above which the switch considers the port unable to run gPTP. This value can be in nanoseconds, microseconds, milliseconds, or seconds.|
|auto||Use a media specific default value for the
Note: These values may change. A draft of the 802.1AS corrigendum (P802.1AS-Cor-1/D1.1) specifies 800 ns for 100BASE-TX and 1000BASE-T.
|correction-field||Specifies configuring the correction field of peer delay messages.|
|fractional-ns-only||Specifies considering only the fractional nano-second portion for peer delay calculations.|
|on_off||Consider only fractional nano-second portion, on or off. Default is off.|
- Lost_responses_value = 3 (802.1AS 11.5.3)
- Log_2_interval = 0 (1 second; not specified in 802.1AS)
- Asymmetry_time = 0 (802.1AS 10.2.4.8)
- Neighbor_thresh_time = Copper media: 800 nanoseconds, fiber media: 4,294,967,295 nanoseconds
- Considering only the fractional nano-second portion of correction field of peer delay messages if off.
Peer Delay messages determine whether a neighboring system is gPTP capable and measure the propagation delay on the link between the switch and a neighboring gPTP capable system.
- allowed-lost-responses corresponds to 802.1AS parameter allowedLostResponses.
- initial-req-interval corresponds to 802.1AS parameter initialLogPdelayReqInterval.
- asymmetry corresponds to 802.1AS parameter delayAsymmetry.
- neighbor-thresh corresponds to 802.1AS parameter neighborPropDelayThresh.
configure network-clock gptp ports 1-3 peer-delay allowed-lost-responses 5 configure network-clock gptp ports 1-2 peer-delay initial-log-interval -3 configure network-clock gptp ports 1-2 peer-delay neighbor-thresh 3 nanoseconds
This command was first available in ExtremeXOS 15.3.
Options to control whether or not you consider only the fractional nano-second portion of correction field of peer delay messages was added in ExtremeXOS 31.1.
This command is available on platforms that support the AVB feature pack license and have it installed. For complete information about software licensing, including how to obtain and upgrade your license, and which platforms support the AVB feature, see the Switch Engine 32.2 Feature License Requirements document.