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Configuration Guide - Security

S1720, S2700, S5700, and S6720 V200R011C10

This document describes the configurations of Security, including 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, MPAC, separating the management plane from the service plane, security risks, PKI.
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Rate Limiting on ARP Packets

Rate Limiting on ARP Packets

When a device is busy with a large number of ARP packets, the CPU may be incapable of processing other services. To protect CPU resources of the device, limit the rate of ARP packets.

The device provides the following measures for limiting the rate of ARP packets:

  • Limiting the rate of ARP packets based on source MAC addresses or source IP addresses

    When detecting that a user host has sent a large number of ARP packets in a short period, the device limits the rate of ARP packets sent from the source MAC address or source IP address of this user host. If the number of ARP packets received per second exceeds the threshold, the device discards the excess ARP packets.
    • Limiting the rate of ARP packets based on source MAC addresses: If a MAC address is specified, the device limits the rate of ARP packets from the specified source MAC address; otherwise, the device limits the rate of ARP packets from any source MAC address.

    • Limiting the rate of ARP packets based on source IP addresses: If an IP address is specified, the device limits the rate of ARP packets from the specified source IP address; otherwise, the device limits the rate of ARP packets from any source IP address.

  • Limiting the rate on ARP packets globally, in a VLAN, or on an interface

    The maximum rate and rate limiting duration of ARP packets can be set globally, in a VLAN, or on an interface. The configurations set in the interface view take precedence over those set in the VLAN view, and those set in the VLAN view take precedence over those set in the system view.

    In addition, the duration for blocking ARP packets can be set on an interface. The device then discards ARP packets that exceed the permitted maximum number of ARP packets within the rate limiting duration, and discards all ARP packets received within the duration specified for blocking ARP packets.

    • Limiting the rate of ARP packets globally: limits all received ARP packets.

    • Limiting the rate of ARP packets in a VLAN: limits the number of ARP packets to be processed on all interfaces in a VLAN. The configuration in a VLAN does not affect ARP entry learning on interfaces in other VLANs.

    • Limiting the rate of ARP packets on an interface: limits the number of ARP packets processed on an interface. The configuration on an interface does not affect ARP entry learning on other interfaces.

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Updated: 2019-03-28

Document ID: EDOC1000178177

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