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S9300, S9300E, and S9300X V200R012C00 Configuration Guide - Ethernet Switching

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, VLAN aggregation, MUX VLAN, VLAN termination, Voice VLAN, VLAN mapping, QinQ, GVRP, STP/RSTP/MSTP, VBST, SEP, RRPP, ERPS, LBDT, HVRP, and Layer 2 protocol transparent transmission.
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Configuring the Switch to Discard Packets That Do Not Match Any MAC Address Entry

Configuring the Switch to Discard Packets That Do Not Match Any MAC Address Entry

Context

After a DHCP user goes offline, the MAC address entry of the user ages out. If there are packets destined for this user, the switch cannot find the MAC address entry and therefore broadcasts the packets to all interfaces in the VLAN. In this case, all users in this VLAN receive the packets, which brings security risks. To reduce the load on the switch and enhance security, configure the switch to discard packets that do not match any MAC address entries.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run vlan vlan-id

    The VLAN view is displayed.

  3. Run mac-miss action discard

    The switch is configured to discard packets that do not match any MAC address entries.

    By default, the switch broadcasts the packets that do not match any MAC address entries in a VLAN.

Verifying the Configuration

Run the display current-configuration command to check whether the switch discards packets that do not match any MAC address entries.

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Updated: 2019-01-18

Document ID: EDOC1100038290

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