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Configuration Guide - Device Management

S7700 and S9700 V200R013C00

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 14-2  Applicable product models and versions


Product Model

Software Version


S7703, S7706, and S7712

V200R010C00, V200R011C10, V200R012C00, V200R013C00

This feature is not supported when MCUD is installed.

S7703 PoE


S7706 PoE



S9703, S9706, and S9712

V200R010C00, V200R011C10, V200R012C00, V200R013C00

Feature Limitations

PTP Constraints

  • All the intermediate devices on the PTP synchronization path must support PTP.
  • When a switch uses the active and standby MPUs and needs to use a clock daughter card, you must install a clock daughter card on both the active and standby MPUs.
  • 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: EH1D2S24CEA0 and X series (except the EH1D2G48TX1E, ET1D2G48TX1E, X5E, X5H, X5L, and X5S boards). On the X1E series boards, a switch needs to be configured to work in enhanced mode using the set service-mode command.

  • In a CSS scenario, PTP is not supported.
  • 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


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.
Updated: 2019-04-20

Document ID: EDOC1100065738

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