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CLI-based Configuration Guide - Security

AR500, AR510, and AR530 V200R007

This document describes the configurations of Security, including AAA, DAA,NAC, BRAS Access, ACL, Firewall, Deep Security Defense, Local Attack Defense;Attack Defense, Traffic Suppression, ARP Security, Port Security, DHCP Snooping, IPSG, URPF, PKI, SSL, HTTPS, Keychain, 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 on a VLANIF interface of a super-VLAN

    A VLANIF interface of a super-VLAN is triggered to learn ARP entries in the following scenarios:
    • The VLANIF interface receives IP packets that trigger ARP Miss messages. For details about ARP Miss messages, see Rate Limiting on ARP Miss Messages.
    • The VLANIF interface enabled with ARP proxy receives ARP packets with the destination IP address matching proxy conditions but not matching any ARP entries.
    The VLANIF interface replicates ARP Request packets to each sub-VLAN when learning ARP entries. If a large number of sub-VLANs are configured for the super-VLAN, the device generates a large number of ARP Request packets. As a result, the CPU is busy processing ARP Request packets, and other services are affected. To prevent this problem, limit the rate of ARP packets on the VLANIF interface of a super-VLAN.
  • Limiting the rate on ARP packets globally or on an interface

    The maximum rate and rate limiting duration of ARP packets can be set globally or on an interface. If the maximum rate and rate limiting duration are configured in the system view and interface view at the same time, the device uses the configurations in the interface view and system view in order.

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

    • 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: 2019-05-25

Document ID: EDOC1000097287

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