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Configuration Guide - Ethernet Switching

S7700 and S9700 V200R011C10

This document describes the configuration of Ethernet services, including configuring link aggregation, VLANs, Voice VLAN, VLAN mapping, QinQ, GVRP, MAC table, STP/RSTP/MSTP, SEP, and so on.
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Enabling MAC Address-triggered ARP Entry Update

Enabling MAC Address-triggered ARP Entry Update

Context

Each network device uses an IP address to communicate with other devices. On an Ethernet network, a host, switching device, or routing device sends and receives Ethernet data frames based on MAC addresses. The ARP protocol maps IP addresses to MAC addresses. 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.

Generally, MAC address entries and ARP entries are consistent. In some scenarios, ARP entries may not be updated immediately after MAC address entries are updated. In Figure 2-12, SwitchA and SwitchB run VRRP to enhance reliability, and the VRRP group functions as the gateway of the server. VRRP packets are transmitted on the direct link between the two switches. The server selects one of network interfaces to send packets. When the server detects a network failure or traffic forwarding failure, it switches traffic to the other interface.
  • SwitchA functions as the master device and the server uses Port1 to send packets. SwitchA learns the ARP entry and MAC entry on Port1, and SwitchB learns the server MAC address on Port2.
  • When the server detects that Port1 is faulty, the server uses Port2 to forward service packets. SwitchA learns the server MAC address on Port2. If the server does not send an ARP Request packet to SwitchA, SwitchA still learns the ARP entry on Port1. In this case, packets sent from SwitchA to the server are forwarded through Port1 until the ARP entry is aged out.
To solve the problem, configure MAC address-triggered ARP entry update on SwitchA and SwitchB. This function enables the switches to update the corresponding ARP entry when the outbound interface in a MAC address entry changes.
Figure 2-12  Networking for configuring MAC address-triggered ARP entry update upon a VRRP active/standby switchover

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:
    • This command 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: 2019-10-18

Document ID: EDOC1000178310

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