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Configuration Guide - Device Management

CloudEngine 8800, 7800, 6800, and 5800 V200R005C10

This document describes the configurations of IP multicast, including IP multicast basics, IGMP, MLD, PIM (IPv4), PIM (IPv6), MSDP, multicast VPN, multicast route management (IPv4), multicast route management (IPv6), IGMP snooping, MLD snooping, static multicast MAC address, multicast VLAN, multicast network management.

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Configuring Clock Source Attributes Used for BMC Selection

Configuring Clock Source Attributes Used for BMC Selection


After multiple 1588v2 devices are configured to import external time signals, you can configure clock source attributes for BMC selection on these devices to enable them to participate in BMC calculation or use the local clocks of these 1588v2 devices for BMC selection. The BMC algorithm can help dynamically determine the master clock, which can provide time signals for the entire 1588v2 network. Slave 1588v2 devices need to obtain time synchronization information from the GMC functioning as the master clock.

During BMC selection, a 1588v2 switch compares the following parameters in sequence to select the master clock:
  • priority1
  • clock-class
  • clock-accuracy
  • priority2
For example, the switch compares priority 1 values of two candidates. If the two candidates have the same priority 1 value, the switch compares clock classes of the two candidates. The process continues until the switch selects a master clock.

Perform the following steps on the 1588v2 device connected to an external clock source.


  1. Run system-view

    The system view is displayed.

  2. Run ptp clock-source local time-source time-source-value

    The type of a clock source to be traced is specified.

    By default, the type of a local clock source is 8, namely, INTERNAL_OSCILLATOR type

  3. (Optional) Run ptp clock-source local clock-accuracy clock-accuracy-value

    A clock accuracy value of the clock source is set.

    By default, the clock accuracy value of a local clock source is 0x31.

  4. (Optional) Run ptp clock-source local clock-class clock-class-value

    The clock class of the clock source is specified.

    By default, the clock class of a local clock source is 187.

    When clock-class-value is less than 128, the device cannot function as a slave clock.

  5. (Optional) Run ptp clock-source local priority1 priority1-value

    The priority 1 value of the clock source is set.

    By default, the priority 1 value of a local clock source is 128.

  6. (Optional) Run ptp clock-source local priority2 priority2-value

    The priority 2 value of the clock source is set.

    By default, the priority 2 value of a local clock source is 128.

  7. Run commit

    The configuration is committed.

Updated: 2020-01-07

Document ID: EDOC1100075362

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