D-Link DWS-4026 [221/741] Configuring mld snooping

ConfiguringMLDSnooping

D-Link UnifiedWiredandWirelessAccessSystem

November2011 Page221

D‐LinkUWSUserManual

ConfiguringMLDSnooping

InIPv4,Layer2switchescanuseIGMPsnoopingtolimitthefloodingofmulticasttrafficbydynamically

configuringLayer‐2interfacessothatmulticasttrafficisforwardedtoonlythoseinterfacesassociatedwithan

IPmulticastaddress.InIPv6,MulticastListenerDiscovery(MLD)snoopingperformsasimilarfunction.With

MLDsnooping

,IPv6multicastdataisselectivelyforwardedtoalistofportsthatwanttoreceivethedata,

insteadofbeingfloodedtoallportsinaVLAN.ThislistisconstructedbysnoopingIPv6multicastcontrol

packets.

MLDisaprotocolusedbyIPv6multicastrouterstodiscoverthepresenceofmul

ticastlisteners(nodeswishing 

toreceiveIPv6multicastpackets)onitsdirectly‐attachedlinksandtodiscoverwhichmulticastpack etsareof

interesttoneighboringnodes.MLDisderivedfromIGMP;MLDversion1(MLDv1)isequivalenttoIGMPv2and

MLDversion2(MLDv2)isequivalenttoIGMPv3.MLDisasubpr

otocolofInternetControlMessageProtocol

version6(ICMPv6),andMLDmessagesareasubsetofICMPv6messages .

TheswitchcansnooponbothMLDv1andMLDv2protocolpacketsandbridgeIPv6multicastdatabasedon

destinationIPv6multicastMACaddresses.TheswitchcanbeconfiguredtoperformMLDsnoopingandIGMP

oopingsimultaneously.

ConfigurationandStatus

UsetheMLDSnoopingGlobalConfigurationandStatuspagetoenableMLDsnoopingontheswitchandview

informationaboutthecurrentMLDsnoopingconfiguration.

Toaccessthispage,clickLAN>L2Features >MLDSnooping>ConfigurationandStatusinthenavigationtree.

Figure132:MLDSnoopingGlobalConfigurationandSt

atus

Table114:MLDSnoopingGlobalConfigurationandStatusFields

Field Description

AdminMode SelecttheadministrativemodeforMLDSnoopingfortheswitchfromthe

pulldownmenu.Thedefaultisdisable.

MulticastControlFrame

Count

Showsthenumberofmulticastcontrolframesthathavebeenprocessedby

theCPU.

InterfacesEnabledforMLD

Snooping

ListstheinterfacescurrentlyenabledforMLDSnooping.Toenablein

terfaces

forMLDsnooping,see“InterfaceConfiguration”onpage222.