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Configuration Guide - Ethernet Switching

S1720, S2700, S5700, and S6720 V200R012(C00 and C20)

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, VLAN aggregation, MUX VLAN, VLAN termination, Voice VLAN, VLAN mapping, QinQ, GVRP, VCMP, STP/RSTP/MSTP, VBST, SEP, RRPP, ERPS, LBDT, and Layer 2 protocol transparent transmission.
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Enabling MAC Address-triggered ARP Entry Update

Enabling MAC Address-triggered ARP Entry Update

Context

Devices on an Ethernet LAN send and receive Ethernet data frames based on MAC addresses. To map IP addresses to MAC addresses, the Address Resolution Protocol (ARP) is used. When two devices on different network segments communicate with each other, they need to map IP addresses to MAC addresses and outbound interfaces according to ARP entries. MAC address-triggered ARP entry update enables a switch to update the outbound interface in an ARP entry immediately after the outbound interface in the corresponding MAC address entry changes.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run mac-address update arp

    The MAC address-triggered ARP entry update function is enabled.

    By default, the MAC address-triggered ARP entry update function is disabled.

    NOTE:
    • Only the S5720EI, S5720HI, S5720I-SI, S5720S-SI, S5720SI, S5730HI, S5730S-EI, S5730SI, S6720EI, S6720HI, S6720S-EI, S6720S-SI, and S6720SI support this command.

    • This function takes effect only for dynamic ARP entries. Static ARP entries are not updated when the corresponding MAC address entries change.
    • The MAC address-triggered ARP entry update function does not take effect after ARP entry fixing is enabled using the arp anti-attack entry-check enable command.
    • After the MAC address-triggered ARP entry update function is enabled, the switch updates an ARP entry only when the outbound interface in the corresponding MAC address entry changes.

Verifying the Configuration

Run the display current-configuration command to check whether the MAC address-triggered ARP entry update function is enabled.

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Updated: 2018-12-24

Document ID: EDOC1100038339

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