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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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Layer 2 Proxy ARP

Layer 2 Proxy ARP

NOTE:
CE6880EI does not support the function.

Possible Causes

ARP request messages are broadcast. When receiving an ARP request message, the switching device broadcasts the message within its broadcast domain. If a switching device receives a large number of ARP request messages and broadcasts them, excessive network resources are consumed. The network is congested and the performance deteriorates. Therefore, services are affected.

Layer 2 proxy ARP effectively distributes the pressure of processing ARP messages by isolating ARP broadcast domains and proxy responding to ARP request messages with local messages. Layer 2 proxy ARP applies to access or convergence devices that connect the gateway and the user.

Implementation Process

When receiving ARP Request messages, switching devices queries DHCP snooping and ARP snooping entries based on the destination IP address.
  1. Query DHCP snooping entries.

    • If the query succeeds, the device responds to ARP request messages carrying information of the DHCP snooping entries.

    • If the query fails, go to step 2.

    NOTE:
    For details on DHCP Snooping, see DHCP Snooping Configuration in the CloudEngine 8800, 7800, 6800, and 5800 Series Switches Configuration - Configuration Guide - Security.
  2. Query ARP snooping entries.

    • If the query succeeds, the device responds to ARP request messages carrying information of the ARP snooping entries.

    • If the query fails, the device processes the ARP request messages based on the original procedure.

    NOTE:
    ARP snooping is a feature applied to Layer 2 switching networks. Devices use ARP snooping to monitor ARP messages and sets up ARP snooping entries recording user information. The information includes source IP addresses of ARP messages, source MAC addresses, inbound interfaces of the messages, and VLANs that the interfaces belong to.
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Updated: 2019-03-21

Document ID: EDOC1000166635

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