Configuring Ptp For An Oc; Establishing The Configuration Task - Huawei Quidway S9300 Configuration Manual

Quidway S9300 Terabit Routing Switch
Configuration Guide - Device Management
l
Networking Requirements of PTP
All the devices on the 1588v2 synchronization channel must support the 1588v2 function.
In the networking, you should prevent an interface from receiving two types of Announce
packets.
On the entire 1588v2 network, all the clocks are organized as the master clocks and slave clocks.
This requires that:
l
l
l
l
l

12.3 Configuring PTP for an OC

12.3.1 Establishing the Configuration Task

Applicable Environment
As shown in
low delay transmission of real-time radio services should be guaranteed. The two devices serve
as OC to transmit time information through 1588v2 packets, which ensures clock
synchronization between devices. OC can provide a high-accurate time source for wireless
devices through the Building Integrated Timing Supply (BITS) system.
Issue 03 (2011-12-29)
If the S9300 is installed with only one MPU, only the BITS interface of the active MPU
needs to receive the external time signal.
The transmission of clock signals is bidirectional, and the transmission of time signals is
unidirectional. The straight-through cable transmits time signals and the crossover cable
transmits clock signals.
NOTE
The Announce packet contains the clock attributes of the peer device, which are used to set up clock master/
slave relationship between the connected devices.
The virtual clock ID of the 1588v2 device must be unique; otherwise, two master devices
are available on a synchronization network. By default, the virtual clock ID is an extension
of the MAC address. The ptp virtual-clock-id command can be used to change the virtual
clock ID.
On the devices where time synchronization is performed, the interfaces sending and
receiving 1588v2 packets must use the same delay measurement mechanism; otherwise,
the time precision is inaccurate.
The devices where time synchronization is performed through 1588v2 packets must be in
the same clock domain; otherwise, the devices cannot set up the time synchronization
relationship.
The encapsulation modes of 1588v2 packets sent from the interfaces of devices where time
synchronization is performed must be the same; otherwise, the devices cannot interwork.
If the clock stratum of the slave clock is high, the 1588v2 interface of the device cannot
enter the slave state. As a result, the device cannot synchronize with the master clock.
Figure 12-4, when two devices transmit wireless data on the IP bearer network, a
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
12 PTP Configuration
210