Allied Telesis Rapier 16Fi-FX Installationsanleitung PDF herunterladen (Seite 51)

Software Version 2.9.1 51

Software Version 2.9.1

C613-10486-00 REV C

Filtering Broadcast and Multicast Packets

For AT-8600, AT-8700XL, AT-8800, and Rapier Series switches, you can now

enhance DHCP snooping filtering so that the switch drops multicast and

broadcast packets sent from a client, except for:

■ ARP packets

■ IGMP Replies and IGMP Leaves packets, when IGMP snooping is enabled

■ DHCP packets, when DHCP snooping is enabled

To enable this filtering, use the command:

enable dhcpsnooping strictunicast

To disable strict unicast filtering, use the command:

disable dhcpsnooping strictunicast

For the AT-8948, x900-48, and AT-9900 Series switches, DHCP filtering works

in conjunction with QoS and Classifiers. The enable dhcpsnooping

strictunicast command causes the switch to drop IGMP packets sent from a

client, except for IGMP Replies and IGMP Leaves packets when IGMP

snooping is enabled.

To enable this filtering, use the command:

enable dhcpsnooping strictunicast

To filter other multicast and broadcast packets, and stop the switch’s hardware

from forwarding IGMP packets, you must configure QoS using the create qos

policy command, and classifiers using the create classifier command.

To disable strict unicast filtering, use the command:

disable dhcpsnooping strictunicast

Command Changes

The following table summarises the new commands:

Command Change

disable dhcpsnooping strictunicast New command

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Allied Telesis Rapier 16Fi-FX Installationsanleitung Seite 51