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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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(Optional) Configuring the Switch to Transparently Transmit ARP Request Packets

(Optional) Configuring the Switch to Transparently Transmit ARP Request Packets


In MFF networking, if the gateway is used to perform accounting according to the length of time users are online, the gateway must be able to accurately record these durations. By default, the MFF-enabled device sends ARP reply packets in response to ARP request packets sent from the gateway. The MFF-enabled device can send ARP reply packets as long as the MFF entry is not aged out. As a result, the gateway considers users online even if they have gone offline.

To solve this problem, configure the MFF-enabled device to transparently transmit ARP request packets sent from the gateway to the user. Then, the MFF-enabled device does not respond to the ARP packets. If the gateway does not receive the ARP reply packet from a user, the gateway considers that the user has gone offline. This configuration allows the gateway to monitor user online/offline status and correctly perform accounting.


  1. Run system-view

    The system view is displayed.

  2. Run vlan vlan-id

    The VLAN view is displayed.

  3. Run mac-forced-forwarding user-detect transparent

    The Switch is configured to transparently transmit ARP request packets.

    By default, the Switch does not transparently transmit ARP request packets.

Updated: 2019-03-28

Document ID: EDOC1000178177

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