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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 on the VLANIF Interface of a Super-VLAN

Configuring Rate Limiting on ARP Packets on the VLANIF Interface of a Super-VLAN

Context

A VLANIF interface in a super-VLAN is triggered to learn ARP entries in the following scenarios:

  • The VLANIF interface receives IP packets that trigger ARP Miss messages.
  • The VLANIF interface is enabled with ARP proxy and receives ARP packets whose destination IP addresses meet the proxy requirements and match no ARP entry.

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.

When the CPU is busy processing packets, set the maximum rate of broadcasting ARP Request packets to a small value. When the CPU is idle, set the maximum rate of broadcasting ARP Request packets to a large value. You can set the maximum rate of broadcasting ARP Request packets based on the actual network environment.

Perform the following steps on the gateway.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run arp speed-limit flood-rate rate

    The maximum rate of broadcasting ARP Request packets on VLANIF interfaces of all super-VLANs is set.

    By default, the maximum rate of broadcasting ARP Request packets on VLANIF interfaces in all super-VLANs is 1000 pps.

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Updated: 2019-04-01

Document ID: EDOC1000178319

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