In general, the clock manager ensures that the time displayed in the Cisco IOS commands show ptp lan clock and show clock match. The following figure shows a typical 1588 PTP network that includes grandmaster clocks, switches in boundary clock mode, and process the announce message by entering the following command: When the router is in Power Profile mode, only the peer_delay mechanism is supported. The defined values include that is, there is no foreign-time source qualification. tag The mean path delay is the For example: The command output is described in the table below. The documentation set for this product strives to use bias-free language. The Cisco PTP implementation supports only the two-step clock and not the one-step clock. Slave IEDs must support tagged and untagged packets. Time-errorAvailable when the clock mode is p2ptransparent or e2etransparent; displays histogram of data for time-error (frequency networks, such as Ethernet networks. The following example configures the switch for boundary clock mode using the peer delay request (pdelay- req) mechanism and uses default values for all PTP interval settings: The following example configures the switch to operate in Default Profile mode and end-to-end transparent mode and uses default and minimum values for the offset from master and mean path delay when the switch is operating in GMC-BC (Grandmaster Boundary mode Constantly exchanged timing messages ensure continued synchronization. The default is the native VLAN of the trunk port. The default is 300. infinite Time properties are preserved indefinitely. Review Information About Precision Time Protocol and Guidelines and Limitations. The round-trip time is assumed to be equal to mean_path_delay/2, however this is not always valid for Ethernet networks. This section describes the following PTP profiles available on the router: Cisco IOS-XE Release 17.7.1 supports Power Profile-2011. - Lapmeciema nov., Cenas, tirdzniecba, Foto, Attli To avoid this, it is recommended to disable PTP on all such interfaces using the no ptp enable command. average time, in nanoseconds, taken by PTP frames to travel between master and slave. 802.1 AS can be configured with domain 0 only on IR8340 platform. profile Port 1 then uses the four timestamps (t1, t2, t3, and by ensuring that: Clocks do not have to negotiate with one another, There is no misconfiguration, such as two master clocks or no master clocks, as a result of the master clock identification Specifies the transport mechanism for clocking traffic. Get Data Sheet Comparison Chart. The following figure illustrates PTP clocks in a master-slave hierarchy within a PTP network. {clock | foreign-master-records | parent | port {FastEthernet | GigabitEthernet} Learn more about how Cisco is using Inclusive Language. The default is 3 (8 seconds). The defined values include Unmatched Follow UpThe switch received a Follow up message when there was no outstanding SYNC message for which it expected IR8340 supports the following PTP device types: OC-slave , boundary clock, and transparent clock on Default Profile/IEEE 1588. (E2E) PTP is designed specifically for industrial, networked measurement and control systems, and is optimal of the following clock types. If the switch is the master or grandmaster clock these values are zero. Boundaryclocksandtransparent clocksarebothmechanismstoprovideaccuratedistributionof thePTPprotocol acrossmulti-port networkcomponentssuchasbridges, routers, andrepeaters. master clock. The port type and number (for example, Gi1/3). Customers who use PTP for message from the Grand Master Clock, it will convert it into a two-step message. The range is 2 to 1. To learn more about how transparent clocks calculate network delays, refer to Transparent Clock. All the other devices on the network synchronize their clocks with the master and are referred to as members. In theory, this power, ptp clock boundary domain foreign-master-records Displays PTP foreign-master-records. To configure process the announce message by entering the ptp Intelligent Electronic Device (IEDs) such as a digital relays or protection devices. command. dot1q Unmatched Peer Delay Response Follow upThe switch received a Peer Delay Response Follow up message without sending a Peer Stable Archive on lore.kernel.org help / color / mirror / Atom feed * [PATCH 4.14 00/63] 4.14.96-stable review @ 2019-01-24 19:19 Greg Kroah-Hartman 2019-01-24 19:19 ` [PATCH 4.14 01/63] ipv6: Consider sk_bound_dev_if when binding a socket to a v4 mapped address Greg Kroah-Hartman ` (66 more replies) 0 siblings, 67 replies; 68+ messages in thread From: Greg Kroah-Hartman @ 2019-01-24 19:19 UTC . transparent time reference and only needs to be synchronized internally, the grandmaster clock can free run. PTP sends messages between the time source and time recipient to determine the This section describes the PTP event message sequences that occur during synchronization. PTP-specific TLV to indicate Grandmaster ID. value Time duration, in seconds, from 0-100000. Drift is the frequency difference between the time source and time recipient clocks. To determine the value in seconds for the ptp global command interval variable, use a logarithmic scale. To change to Boundary Clock Mode and the peer_delay mechanism, enter the ptp However, as a precise timing distribution mechanism, 802.1AS The ordinary and boundary clocks configured for the delay request-response mechanism use the following event messages to generate PortsUntagged Layer 2 packets. native enabled, vlan Miscellaneous ErrorThis counter indicates the number of miscellaneous errors that have occurred in the PTP protocol. timeout as follows: When the grandmaster clock requires tagged packets, make one of the following configuration changes: Force the switch to send tagged frames by entering the global vlan clock. If the switch receives a one-step Refer to Configuring Default Profile Mode on the Switch for a complete description of this command. PTP packets originated on the port configured with GMC Block are still allowed to egress from this interface, which allows Systems, and was developed to synchronize the clocks in packet-based networks that include distributed device clocks of varying out of standby. ptp timeout NTP is capable of synchronizing a device within a few 100 milliseconds across the This delay measurement principle determines path delay between devices on the network, and the local clocks are adjusted for native command. ** There is no mode setting for 802.1AS. Resident time, however, does not take into consideration the link delay between peers, which is handled by peer-to-peer transparent table to verify packet CRC fields. Which is most affordable Cisco switch with PTP feature. mode to reduce jitter and error accumulation. Over 16 hops, slave device synchronization accuracy is within 1 usec (1 microsecond). Any The default PTP profile mode on the router is Default Profile mode. vlan In this mode, the switch participates in This delay can cause device clocks on the network to lose synchronization with is the same as the time required from time recipient to time source. However, egress PTP packets are still allowed Power Profile Mode Tagging Behavior for PTP Packets PTP Clock Modes Supported on the Switch Configurable Boundary Clock Synchronization Algorithm Prerequisites Guidelines and Limitations Default Settings Configuring PTP on the Switch Configuring PTP Power Profile Mode on the Switch Configuring Default Profile Mode on the Switch native VLAN. transparentUpdates the PTP time correction field to account for the delay in forwarding the traffic. Default profile uses L3 transport multicast address 224.0.1.129 for all PTP messages. native command. error * residence time). clock-port For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Port 2 returns timestamps t2 and t3 in the Pdelay_Resp and Pdelay_Resp_Follow_Up messages respectively. The following PTP clock modes do not support EtherChannels: The following PTP clock modes only operate on a single VLAN: By default, the switch uses configuration values defined in the PTP Power Profile (Power Profile mode is enabled). Precision Time Protocol (PTP) is defined in IEEE 1588 as Precision Clock Synchronization for Networked Measurements and Control Systems, and was developed to synchronize the clocks in packet-based networks that include distributed device clocks of varying precision and stability. Peer delay responseEvent message tagged with a timestamp when data packets reach or leave a port and used to measure the to send tagged packets to the grandmaster clock, enter the global vlan mode This clock can be directly connected to the reference clock. In boundary Learn more about how Cisco is using Inclusive Language. This switch does not participate in master clock selection and uses the default PTP Delay requestEvent message tagged with a timestamp when data packets reach or leave a port and used to synchronize ordinary PTP-specific type, length, and value to indicate Grandmaster ID. The benefits of using PTP in an Ethernet network include: Low cost and easy setup in existing Ethernet networks, Limited bandwidth is required for PTP data packets. An ordinary clock is a PTP clock with a single PTP port. Peer-to-peer transparent clocks use the following event messages: Port 1 generates timestamp t1 for a Pdelay_Req message. Boundary clocks have more than The ordinary and boundary clocks configured for the delay request-response mechanism use the following event messages to Sanity CheckThe PTP message header field(s) of ingress PTP packets are invalid. PTP messages that have a timestamp are Sync, Delay_Req, Pdelay_Req, and Pdelay_Resp. SoftwareIn Power Profile mode, the router uses the configuration values defined in the IEEE 1588 Power Profile standard. OffsetAvailable when the clock mode is boundary; displays histogram for offset from master. In theory, Switch, CGS 2520 Switch, and CG Ethernet Switch Module (ESM). profile power, transport ethernet multicast However, the configuration guide shows the following: The BMCA specifies how each clock on the network Configures the PTP clock. This document uses the term switch to refer to any of these platforms. Gultas ,dvni, izlaiami krsli, un citas mbeles Tukums, dzelzcea iela 3a. clocks measure PTP event message transit time in the same way E2E transparent clocks do, as described above. PTP packets originated on the port configured with GMC Block are still allowed to egress from this interface, which allows Peer-to-peer transparent clocks using the peer_delay mechanism. Restrictions and Limitations for PTP . A switch configured for peer-to-peer transparent clock mode does not synchronize its clock with the master clock. domain-number the selection of the most accurate master clock. The Peer delay follow upGeneral message (not tagged with a timestamp) used to measure the link delay in transparent clocks. The Power Profile defines a subset of PTP which is intended to run over layer 2 networks, that is, Ethernet, but no Internet If Master 1 becomes unavailable, the boundary clock slaves switch to Master 2 for synchronization. E2E transparent clocks do not provide correction for the propagation delay of the link itself. The timestamp error counter is incremented when the software is unable to fetch the timestamp for a given PTP message. The following figure shows an example of an industrial network based on the Industrial Automation and Control System Reference (Duplicates * Delay Request-Response Default PTP profile (as defined in IEEE1588 J.3). grandmaster clock. When VLAN is disabled on the grandmaster clock, the PTP interface must be configured as an access port. converges more slowly than a PTP algorithm that does not. Unmatched Delay ResponseThe switch received a Delay Response without sending a Delay Request. The direction of the data displayed in the table: Ingress (input) or Egress (output). for each PTP profile mode. The 1.2. . The domain number of a gPTP domain shall be 0. This update compensates for switch delay and has an accuracy of within one picosecond. To configure the license level to network-advantage, use the following CLI: Smart grid power automation applications such as peak-hour billing, virtual power generators, and outage monitoring and management,
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