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Configuration Guide - Security

S7700 and S9700 V200R011C10

This document describes the configurations of Security, including ACL, reflective ACL, local attack defense, MFF, attack defense, traffic suppression and storm control, ARP security, port security, DHCP snooping, ND snooping, PPPoE+, IPSG, SAVI, URPF, keychain, separating the management plane from the service plane, security risks.
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Configuring Rate Limiting on ARP Packets based on Source MAC Addresses

Configuring Rate Limiting on ARP Packets based on Source MAC Addresses

Context

A large number of ARP packets with a fixed source MAC address and variable IP addresses will cause the CPU of a device to be overloaded and exhaust ARP entries.

To prevent this problem, configure the gateway to limit the rate of ARP packets based on MAC addresses. The gateway then collects statistics on ARP packets sent from certain MAC addresses to the CPU. If the number of ARP packets received in one second from the specified MAC address exceeds the threshold, the device discards the excess ARP packets.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Configure rate limiting on ARP packets based on source MAC addresses.

    • Run arp speed-limit source-mac maximum maximum

      The maximum rate of ARP packets from any source MAC address is set

    • Run arp speed-limit source-mac mac-address maximum maximum

      The maximum rate of ARP packets from the specified source MAC address is set.

    When both the preceding commands are executed, the arp speed-limit source-mac mac-address maximum maximum command takes effect on ARP packets from the specified source MAC address, and the arp speed-limit source-mac maximum maximum command takes effect on ARP packets from other source MAC addresses.

    By default, the maximum rate of ARP packets from each source MAC address is set to 0, that is, the rate of ARP packets is not limited based on source MAC addresses.

    After the optimized ARP reply function (disabled by default) is enabled using the undo arp optimized-reply disable command, rate limiting on ARP packets based on the source MAC address does not take effect.

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Updated: 2019-09-23

Document ID: EDOC1000178319

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