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Configuration Guide - Security

S1720, S2700, S5700, and S6720 V200R011C10

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, URPF, keychain, MPAC, separating the management plane from the service plane, security risks, PKI.
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Configuring the Aging Time of Temporary ARP Entries

Configuring the Aging Time of Temporary ARP Entries


In addition to generating ARP Miss messages, the device generates temporary ARP entries and sends ARP Request packets to the destination network.
  • In the aging time of temporary ARP entries:
    • Before receiving an ARP reply packet, the device discards the IP packets matching the temporary ARP entry and does not generate ARP Miss messages.
    • After receiving an ARP Reply packet, the device generates a correct ARP entry to replace the temporary entry.
  • When temporary ARP entries age out, the device clears them. If no ARP entry matches the IP packets forwarded by the device, ARP Miss messages and temporary ARP entries are repeatedly generated.

You can limit the rate of ARP Miss messages by setting the aging time of temporary ARP entries. When a device undergoes an ARP Miss attack, you can extend the aging time of temporary ARP entries to reduce the frequency of triggering ARP Miss messages so that the impact on the device is minimized.


  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. (Optional) 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.

    Only the S5720HI, S5720EI, S6720EI, and S6720S-EI support switching between Layer 2 and Layer 3 modes.

  4. Run arp-fake expire-time expire-time

    The aging time of temporary ARP entries is set.

    By default, the aging time of temporary ARP entries is 3 seconds.

Updated: 2019-09-23

Document ID: EDOC1000178177

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