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Configuration Guide - Device Management

S9300, S9300E, and S9300X V200R012C00

This document describes the configurations of Device Management, including device status query, hardware management, CSS, SVF, PoE, OPS, OIDS, energy-saving management, information center, fault management, NTP, synchronous ethernet, PTP.
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Licensing Requirements and Limitations for PTP

Licensing Requirements and Limitations for PTP

Involved Network Elements

BITS clock source

Licensing Requirements

PTP is a basic feature of a switch and is not under license control.

Version Requirements

Table 13-2  Applicable product models and versions

Product

Product Model

Software Version

S9300

S9303, S9306, and S9312

V100R002, V100R003, V100R006(C00&C01), V200R001C00, V200R002C00, V200R003C00, V200R005C00SPC300, V200R006C00, V200R007C00, V200R008(C00&C10), V200R009C00, V200R010C00, V200R011C10, V200R012C00

S9300

S9310

V200R010C00, V200R011C10, V200R012C00

S9300E

S9303E, S9306E, and S9312E

V200R001C00, V200R002C00, V200R003C00, V200R005C00SPC300, V200R006C00, V200R007C00, V200R008(C00&C10), V200R009C00, V200R010C00, V200R011C10, V200R012C00

S9300X

S9310X

V200R010C00, V200R011C10, V200R012C00

Feature Limitations

PTP Constraints

  • All the intermediate devices on the PTP synchronization path must support PTP.
  • The switch must be configured with a CKM-clock daughter card and the cards that support the 1588v2 function. If the switch is equipped with two main control units, a CKM-clock daughter card must be installed in each main control unit. The following cards support the 1588v2 function: X series (V200R009 or later, except the LE1D2G48TX1E, LE1D2G48TX1C, and LE3D2G48TX1L cards), LE0DG24CEAS0, LE1D2S04SEC0, LE1D2X32SEC0, and LE1D2H02QEC0. The 1588v2 function takes effect only after the enhanced working mode is configured using the set service-mode command on the cards.

  • An interface does not support the PTP function after switching to the WAN mode.
  • Interfaces BITS0 and BITS1 on MPUs receive frequency signals and time signals, respectively.
  • When the PTP system needs to receive external clock signals through BITS interfaces, the same BITS interfaces (BITS0 for example) on the clock cards of active and standby MPUs, must receive the same external clock signals. If the device has only one MPU installed, only the BITS interface of the MPU needs to receive external clock signals.
  • Frequency signals are transmitted bidirectionally, and time signals are transmitted unidirectionally. For frequency signals, a crossover cable is required; for time signals, a straight-through cable is required.
  • PTP Announce messages contain the clock attributes of the peer device to establish the master-slave hierarchy of interfaces. Therefore, prohibit a PTP interface from receiving Announce messages from different devices.

PTP Precautions

NOTE:

Before configuring PTP for time synchronization, ensure frequency synchronization on the entire network. To implement frequency synchronization, configure synchronous Ethernet. This chapter describes only PTP time synchronization. For details about how to configure PTP for frequency synchronization, see "Synchronous Ethernet Configuration" in Device Management.

  • PTP messages are Layer 2 broadcast messages by default. If incorrect configuration is performed, loops or broadcast storms occur and downstream devices are seriously affected. To avoid broadcast storms or loops, configure VLAN or STP before enabling PTP on an interface.
  • By default, a device obtains frequency signals through synchronous Ethernet and obtains time signals through PTP. When PTP is used for clock synchronization, you are advised to configure the device to obtain frequency signals and time signals through PTP.
  • On a switch with two MPUs, frequent active/standby switchovers (within 15 minutes) may result in a jitter of 400 ns. You are advised to perform other operations 20 minutes later than an active/standby switchover.
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Updated: 2018-09-03

Document ID: EDOC1100038289

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