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NE20E-S2 V800R010C10SPC500 Configuration Guide - System Management 01

This is NE20E-S2 V800R010C10SPC500 Configuration Guide - System Management
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Configuring LAD

Configuring LAD

Link Automatic Discovery (LAD) allows a device to issue link discovery requests and generates neighbor information based on the received link discovery replies. The device then saves local and neighbor information in the local MIB. The NMS can query neighbor information in the MIB and generate the topology of the entire network, helping network administrators locate inappropriate configurations.

Usage Scenario

LAD discovers physical and logical links when devices are connected directly or over a Layer 2 network. The information provided by LAD helps network administrators promptly obtain detailed network topology and changes in the topology and monitor the network status in real time, ensuring security and stability for network communication. On the network shown in Figure 3-1, before the NMS collects the topology of Device A and Device B, enable LAD on Device A and Device B so that Device A can send LAD packets to Device B and Device B can respond with LAD packets. After Device A receives LAD packets, it generates neighbor information and saves it in the local MIB, helping the NMS obtain the network topology.

Figure 3-1 LAD networking

Pre-configuration Tasks

Before configuring LAD, configure reachable routes between devices and the NMS and configure NETCONF parameters.

Procedure

  • Enable LAD on Device A and Device B.
    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The view of an interface on which LAD is to be enabled is displayed.

    3. (Optional) Run link-detect enable

      LAD is enabled on the interface.

    4. Run commit

      The configuration is committed.

  • Enable Device A to send LAD packets to Device B.
    1. Run link detect [ slot slot-id | interface interface-type interface-number | all ]

      Device A is enabled to send LAD packets to Device B.

Checking the Configurations

After configuring LAD, check the configurations.

  • Run the display link neighbor { slot slot-id | interface interface-type interface-number | all } command to check neighbor information of interfaces.

Run the display link neighbor all command to view neighbor information of all interfaces.

<HUAWEI> display link neighbor all
GigabitEthernet0/2/0 has neighbors:
 TxNeId   TxInterface  TxVlanOrVc12  TxVc4Id  ---  RxNeId   RxInterface  RxVlanOrVc12  RxVc4Id
 0x6      ETH0/2/0     0             0        ---  0x10001  ETH0/2/0    0             0
GigabitEthernet0/2/1 has neighbors:
 TxNeId   TxInterface  TxVlanOrVc12  TxVc4Id  ---  RxNeId   RxInterface  RxVlanOrVc12  RxVc4Id
 0x6      ETH0/2/1     0             0        ---  0x9000a  ETH0/2/1    0             0
GigabitEthernet0/2/2 has neighbors:
 TxNeId   TxInterface  TxVlanOrVc12  TxVc4Id  ---  RxNeId   RxInterface  RxVlanOrVc12  RxVc4Id
 0x6      ETH0/2/2     0             0        ---  0x9000a  ETH0/2/2    0             0
Total records of slot 2: 3
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Updated: 2019-01-02

Document ID: EDOC1100055400

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