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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 Gratuitous ARP Packet Discarding

Configuring Gratuitous ARP Packet Discarding

Context

Any user host can send gratuitous ARP packets without being authenticated. This causes the following problems:
  • If a large number of gratuitous ARP packets are broadcast on the network, network devices cannot process valid ARP packets due to CPU overload.
  • If a device processes bogus gratuitous ARP packets, ARP entries are updated incorrectly, leading to communication interruptions.

To solve the preceding problems, enable the gratuitous ARP packet discarding function on the gateway.

The function of discarding gratuitous ARP packets can be enabled in the system view or the interface view.
  • If the function is enabled in the system view, all interfaces on the device discard gratuitous ARP packets.
  • If the function is enabled in the interface view, only the interface discards gratuitous ARP packets.
NOTE:

Do not enable the gratuitous ARP packet discarding function on a network-side interface.

Procedure

  • Configuring gratuitous ARP packet discarding globally
    1. Run system-view

      The system view is displayed.

    2. Run arp anti-attack gratuitous-arp drop

      Gratuitous ARP packet discarding is enabled.

      By default, gratuitous ARP packet discarding is disabled.

    3. Run commit

      The configuration is committed.

  • Configuring gratuitous ARP packet discarding on the interface
    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. On an Ethernet interface, run undo portswitch

      The interface is switched to Layer 3 mode.

      By default, an Ethernet interface works in Layer 2 mode.

      The mode switching function takes effect when the interface only has attribute configurations (for example, shutdown and description configurations). Alternatively, if configuration information supported by both Layer 2 and Layer 3 interfaces exists (for example, mode lacp and lacp system-id configurations), no configuration that is not supported after the working mode of the interface is switched can exist. If unsupported configurations exist on the interface, delete the configurations first and then run the undo portswitch command.

      NOTE:

      If many Ethernet interfaces need to be switched to Layer 3 mode, run the undo portswitch batch interface-type { interface-number1 [ to interface-number2 ] } &<1-10> command in the system view to switch these interfaces to Layer 3 mode in batches.

    4. Run arp anti-attack gratuitous-arp drop

      Gratuitous ARP packet discarding is enabled.

      By default, gratuitous ARP packet discarding is disabled.

    5. Run commit

      The configuration is committed.

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Updated: 2019-04-20

Document ID: EDOC1100074765

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