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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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(Optional) Enabling Timed Gateway Address Detection

(Optional) Enabling Timed Gateway Address Detection

Context

On a live network, services may be interrupted for a long time because the MFF-enabled device cannot immediately detect changes to the gateway MAC address. Timed gateway detection can solve this problem. With the timed gateway address detection function, a device scans recorded gateway information every 30 seconds. For each gateway recorded, the MFF-enabled device uses information about any user to construct an ARP request packet and sends it to the network interface. The MFF-enabled device then learns the gateway MAC address from the ARP reply packet. If the gateway MAC address has changed, the MFF-enabled device immediately updates the gateway information and broadcasts gratuitous ARP packets to user devices, so that user devices can update the gateway address.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run vlan vlan-id

    The VLAN view is displayed.

  3. Run mac-forced-forwarding gateway-detect

    Timed gateway detection is enabled.

    By default, timed gateway detection is disabled.

  4. Run commit

    The configuration is committed.

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Updated: 2019-04-20

Document ID: EDOC1100074765

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