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Configuration Guide - Ethernet Switching

S7700 and S9700 V200R012C00

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, HVRP, and Layer 2 protocol transparent transmission.
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MAC Address-Triggered ARP Entry Update

MAC Address-Triggered ARP Entry Update

Hosts 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 hosts 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, the outbound interfaces in the matching MAC address entries and ARP entries are consistent. In Figure 2-7, the outbound interface in both the MAC address entry and ARP entry is GE1/0/1 at T1. The interface is then changed. At T2, after a packet is received from the peer device, the outbound interface in the MAC address entry is immediately changed to GE1/0/2. However, the outbound interface in the ARP entry remains as GE1/0/1. At T3, the aging time of the ARP entry expires, and the outbound interface in the ARP entry is changed to GE1/0/2 through ARP aging probe. Between T2 and T3, the outbound interface in the ARP entry is unavailable, interrupting communication between devices on different network segments.

Figure 2-7  MAC address-triggered ARP entry update is not enabled

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. Figure 2-8 shows a scenario where MAC address-triggered ARP entry update is enabled. At T2, after the outbound interface in the MAC address entry is changed to GE1/0/2, the outbound interface in the ARP entry is immediately changed to GE1/0/2. This function ensures communication is not interrupted between T2 and T3 due to the incorrect outbound interface in the ARP entry.

Figure 2-8  MAC address-triggered ARP entry update is enabled
NOTE:

The MAC address-triggered ARP entry update function is often used in scenarios where switches in a Virtual Router Redundancy Protocol (VRRP) group connect to servers (see Configuring MAC Address-Triggered ARP Entry Update to Improve VRRP Switchover Performance), or Layer 3 traffic switching scenarios where STP and Smart Link are used.

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Updated: 2019-01-18

Document ID: EDOC1100038843

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