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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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Configuring Port-based Automatic Local Attack Defense

Configuring Port-based Automatic Local Attack Defense

Context

When a protocol is enabled, the switch automatically assigns a queue to the protocol packets and a default CAR value for the queue. If a port receives many packets of a protocol and sends the packets to the CPU, the other ports send the packets of this protocol to the CPU at a low speed or fail to send the packets to the CPU. This affects services.

After port-based automatic local attack defense is enabled, the switch moves the packets of this protocol to a queue with a small CAR value in either of the following situations:
  • The rate of such protocol packets received on a port exceeds 75% of the default CAR value.
  • The rate of such protocol packets received on the two ports that have received the most packets of this type exceeds 85% of the default CAR value.

This function ensures that other ports can normally send protocol packets to the CPU.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run cpu-defend policy policy-name

    The attack defense policy view is displayed.

  3. Run undo auto-port-defend protocol { arp-request | dhcp | multicast | ospf | nd | vrrp } disable

    Port-based automatic local attack defense is enabled.

    By default, port-based automatic local attack defense is enabled.

    NOTE:

    After ARP rate limiting is enabled on all interfaces, port-based automatic local attack defense for ARP does not take effect.

    The CE5880EI and CE6880EI support only the arp-request parameter.

  4. Run commit

    The configuration is committed.

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Updated: 2019-04-20

Document ID: EDOC1100074765

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