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Configuration Guide - Security

CloudEngine 8800, 7800, 6800, and 5800 V200R005C10

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, separating the management plane from the service plane, security risks.
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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 of ARP packets based on destination IP addresses

    When processing a large number of ARP packets with the same destination IP address, the device limits the rate of ARP packets based on the destination IP address. The device collects statistics on ARP packets with a specified destination IP address. If the number of received ARP packets with the specified destination IP address per second exceeds the threshold, the device discards the excess ARP packets.

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

    The maximum rate of ARP packets can be set in the system view, VLAN view, and interface view. If the maximum rate is configured in the system view, VLAN view, and interface view at the same time, the device uses the configurations in the interface view, VLAN view, and system view in order.

    NOTE:

    CE6870EI and CE6875EI do not support limiting the rate on ARP packets on an interface.

    • 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: 2019-04-20

Document ID: EDOC1100074765

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