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CLI-based Configuration Guide - IP Service

AR500, AR510, AR531, AR550, AR1500, and AR2500 V200R010

This document describes the concepts and configuration procedures of IP Service features on the device, and provides the configuration examples.
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Enabling a Device to Learn Multicast MAC Addresses and Generate ARP Entries

Enabling a Device to Learn Multicast MAC Addresses and Generate ARP Entries

When a device is enabled to learn multicast MAC addresses, the device can generate ARP entries after receiving ARP packets carrying multicast MAC addresses as source MAC addresses.

Background Information

IP addresses may be mapped to multicast MAC addresses in some service scenarios. As shown in Figure 2-11, the device is connected to the network load balance (NLB) group through a Layer 2 LAN switch (LSW). The NLB group works in multicast mode; that is, the MAC address of the NLB group is a multicast MAC address. In this case, a network administrator can enable the device to dynamically learn multicast MAC addresses and generate ARP entries. This reduces the network administrator's workload of configuring static ARP entries and reduces network operation and maintenance costs.
Figure 2-11  Device connected to the NLB group through a Layer 2 LSW

Procedure

  • Globally enable a device to learn multicast MAC addresses.
    1. Run system-view

      The system view is displayed.

    2. Run arp learning multicast enable

      The device is globally enabled to learn multicast MAC addresses and generate dynamic ARP entries.

      By default, a device is globally disabled from learning multicast MAC addresses.

      NOTE:

      If a device is globally enabled to learn multicast MAC addresses, the interfaces of this device are enabled to learn multicast MAC addresses.

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Updated: 2019-05-20

Document ID: EDOC1100034231

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