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NE40E V800R011C10 Configuration Guide - System Management 02
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Configuring CU-106

Configuring CU-106

Usage Scenario

On the network shown in Figure 10-2, the BITS interface that functions as the T-GM obtains high-accuracy time information from a global positioning system (GPS), encapsulates the information into a CU-106 packet, and sends the packet to the bearer network. A bearer network device that functions as the T-BC transparently transmits the time information to all devices on the bearer network. BCs send high-accuracy time information carried in the CU-106 packet to wireless access devices, such as a NodeB and a radio network controller (RNC).
Figure 10-2 CU-106 application over a bearer network

Pre-configuration Tasks

  • Set physical parameters of interfaces and ensure that the interfaces are physically Up.

Configuring the BITS Clock Source as the T-GM

You can introduce a clock source that functions as the grandmaster clock on the T-GM of building integrated timing supply system (BITS). This clock source provides the source of time signals for T-BCs to achieve time synchronization between the T-GM and T-BCs.

Context

For details about the clock source configuration of the T-GM on BITS, see the associated configuration guide.

Configuring Clock Source Attributes Used for BMC Selection

This section describes how to configure clock source attributes used for BMC selection. routers configured with clock source attributes can participate in BMC selection. A local clock on a CU-106 router can also participate in BMC selection. The BMC algorithm helps CU-106 routers to select a master clock. The master clock provides time signals for other routers over a CU-106 network. CU-106 routers obtain clock synchronous information from the grandmaster.

Context

Perform the following steps on each router that is connected to a BITS:

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run ptp clock-source bits0 grandmaster-clockid grandmaster-clockid-value

    Specifies the ID of the grandmaster clock.

  3. Run ptp clock-source bits0 clock-accuracy clock-accuracy-value

    Specifies the accuracy value of the clock source.

  4. Run ptp clock-source bits0 clock-class clock-class-value

    Specifies the clock class for the BITS source.

    In T-BC mode, the default clock class is 248. If the clock class of the locked clock is less than 135, the clock class automatically changes to 165 after the clock is out of lock and this clock class cannot be configured.

  5. Run ptp clock-source local priority2 priority2-value

    The priority 2 of the local clock source is set.

  6. Run ptp clock-source local local-priority local-priority-value

    The priority of the local clock source is set.

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

    The time source of the local clock source is configured.

  8. Run commit

    The configuration is committed.

Configuring CU-106 Globally

You need to enable CU-106 on a router in the system view, configure the router as a T-BC, specify the domain to which the router belongs to, and enable the static configuration of the status of the T-BC interface.

Context

Perform the following operations on the T-BC:

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run ptp enable

    PTP is enabled.

  3. Run ptp profile cu-106 enable

    CU-106 is enabled.

  4. Run ptp device-type t-bc

    The device type is set to T-BC.

  5. (Optional) Run ptp domain domain-value

    The domain where the device resides is configured.

    Devices in the same clock domain can exchange CU-106 packets to synchronize time signals.

  6. (Optional) Run ptp virtual-clock-id clock-id-value

    A virtual clock ID is set.

  7. (Optional) Configure automatic asymmetry measurement for fibers.
    1. Run ptp asymmetry-measure enable

      Automatic asymmetry measurement is enabled on the router.

    2. Run ptp passive-measure enable

      The performance monitoring function is enabled on the passive interface of a CU-106 device.

    3. Run ptp passive-measure alarm-threshold alarm-threshold-value

      An alarm threshold is configured for the time offset (time difference between the master and slave clocks) on the passive interface of a CU-106 device.

  8. Run commit

    The configuration is committed.

(Optional) Configuring the Time Synchronization Alarm Function

After the time synchronization alarm function is configured to monitor time synchronization status information, the alarm information will be reported to the NMS for further troubleshooting and maintenance.

Context

Perform the following operations on the T-BC:

Procedure

  1. Run system-view

    The system view is displayed.

  2. Configure the time synchronization alarm function as required.

    • Run the ptp alarm-threshold clock-class clock-class-value command to configure the alarm threshold for PTP source input deterioration.

    • Run the ptp alarm-threshold standard-time-offset time-offset-value command to configure the alarm threshold for the PTP source absolute time reference.

    • Run the ptp alarm-threshold time-offset-sum time-offset-sum command to configure the alarm threshold for the peak value of the accumulated PTP source time offsets.

  3. Run commit

    The configuration is committed.

Configuring CU-106 on an Interface

After enabling CU-106 in the system view, you need to enable CU-106 in the interface view.

Context

Perform the following operations on the T-BC:

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. Run ptp enable

    PTP is enabled on the interface.

  4. (Optional) Run ptp local-priority local-priority-value

    The local priority of a PTP interface is set.

  5. (Optional) Run ptp asymmetry-correction { negative negative-asymmetry-correction-value | positive positive-asymmetry-correction-value }

    The asymmetric correction time for sending CU-106 packets on the interface is set.

  6. (Optional) Run ptp clock-step { one-step | two-step }

    The timestamping mode of the synchronization packets sending by the CU-106 port is set.

  7. Run commit

    The configuration is committed.

Configuring Time Attributes for CU-106 Packets

This section describes how to configure time attributes for CU-106 packets. T-BCs exchange Announce, Sync, and Delay or Pdelay packets to send time information and maintain CU-106 connections. You can set the interval at which a CU-106 interface sends Announce, Sync, and Delay or Pdelay packets and the maximum number of Announce packet timeouts. Using the default time attribute values is recommended.

Context

Perform the following operations on the T-BC:

Procedure

  • Configure time attributes for Announce packets.
    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. Run ptp announce-interval announce-interval

      The interval at which the interface sends Announce packets is set. The following formula applies:

      Interval = 2n x 1/1024s, where n equals to announce-interval

      Remote timeout period of receiving Announce packets = Remotely configured receipt-timeout x Local interval at which Announce packets are sent

    4. Run ptp announce receipt-timeout receipt-timeout

      The maximum number of Announce packets that the interface fails to receive is set. If the interface fails to consecutively receive the specified maximum number of Announce packets, the interface enters the Master state.

      Local timeout period of receiving Announce packets = Locally configured receipt-timeout x Remote interval at which Announce packets are sent

    5. Run commit

      The configuration is committed.

  • Configure time attributes for Sync packets.
    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. Run ptp sync-interval sync-interval

      The interval at which the interface sends Sync packets is set. The following formula applies:

      Interval = 2n x 1/1024s, where n equals to sync-interval

    4. Run commit

      The configuration is committed.

  • Configure time attributes for Delay or Pdelay packets.
    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. Run ptp min-delayreq-interval min-delayreq-interval

      The interval at which the interface sends Delay_Req packets is set. The following formula applies:

      Interval = 2n x 1/1024s, where n equals to min-delayreq-interval

    4. Run commit

      The configuration is committed.

Configuring Encapsulation Modes for CU-106 Packets

You can configure destination MAC addresses of packets according to the actual networking.

Prerequisites

By default, CU-106 packets are encapsulated in MAC encapsulation mode.

Context

Perform the following operations on the T-BC:

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. Run ptp mac-egress destination-mac destination-mac

    The CU-106 packets to be sent from the interface is encapsulated in MAC encapsulation mode, and a destination MAC address is configured.

  4. Run commit

    The configuration is committed.

Verifying the Configuration of CU-106

After configuring the CU-106 function, verify the configuration.

Procedure

  • Run the display ptp all [ state | config ] command to view the time synchronization status and configurations of device operation.
  • Run the display ptp interface interface-type interface-number command to view the time synchronization information on a device interface.
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Updated: 2020-02-10

№ do documento: EDOC1100125843

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