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Configuration Guide - IP Service

CloudEngine 8800, 7800, 6800, and 5800 V200R002C50

This document describes the configurations of IP Service, including IP address, ARP, DHCP, DNS, IP performance optimization, IPv6, DHCPv6, and IPv6 DNS.
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Fast ARP Reply

Fast ARP Reply

As shown in Figure 2-7, the Switch functioning as a gateway connects to multiple servers or virtual machines (VMs). The servers or virtual machines (VMs) send ARP Request packets to the gateway at a fixed interval to detect whether the gateway is working properly. The destination IP address of the ARP Request packets is the IP address of the gateway. Processing a large number of ARP Request packets slows the ARP response of the gateway and even causes the gateway unable to respond to the ARP Request packets of some servers or virtual machines (VMs). The ARP entries of the servers or virtual machines (VMs) are then aged out on the gateway. As a result, packet loss or service interruption occurs.

Fast ARP reply can reduce load on the gateway and improve ARP packet processing efficiency. When the gateway learns the ARP entries of the servers or virtual machines (VMs), the gateway directly sends ARP Response packets to the servers or virtual machines (VMs) without learning ARP entries again. This method reduces the packet processing pressure on the gateway. Fast ARP response allows a device to directly send ARP Response packets in response to ARP Request packets with the destination IP address as the IP address of the device. This function speeds up ARP response and ensures uninterrupted service forwarding.

Figure 2-7  Typical networking for fast ARP response
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Updated: 2019-03-21

Document ID: EDOC1000166635

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