System information

Publication date: Feb., 2012
Revision A1
- 107 -
CLIReferenceGuide
Copyright @ 2012 by Amer Networks
Chapter 29 MLDCommandsofCLI
MLD
Curiouslyenough,anetworknodethatactsasasourceofIPv6multicast
trafficisonlyanindirectparticipantinMLDsnooping—itjustprovides
multicasttraffic,andMLDdoesn’tinteractwithit.(Note,however,thatin
anapplicationlikedesktopconferencinganetworknodemayactasboth
asource
andanMLDhost;butMLDinteractswiththatnodeonlyinits
roleasanMLDhost.)
Asourcenodecreatesmulticasttrafficbysendingpacketstoamulticast
address.InIPv6,addresseswiththefirsteightbitsset(thatis,“FF”asthe
firsttwocharactersoftheaddress)
aremulticastaddresses,andanynode
thatlistenstosuchanaddresswillreceivethetrafficsenttothataddress.
Applicationsoftwarerunningonthesourceanddestinationsystems
cooperatestodeterminewhatmulticastaddresstouse.(Notethatthisis
afunctionoftheapplicationsoftware,notofMLD.)
WhenMLDsnoopingisenabledonaVLAN,theswitchactstominimize
unnecessarymulticasttraffic.Iftheswitchreceivesmulticasttraffic
destinedforagivenmulticastaddress,itforwardsthattrafficonlytoports
ontheVL ANthathaveMLDhostsforthataddress.Itdropsthattrafficfor
ports
ontheVL ANthathavenoMLDhosts.
Table 28: MLD Commands
Command Function
compatibility
Set the Versions of MLD Operating on Hosts and Routers
delete
Delete commands
fast-leave
Set per-port Fast Leave
filtering
The IP Multicast Group that will be filtered
flooding
Set MLD Flooding Mode
lmqi
Set the per-VLAN Last Member Query Interval
proxy
Set MLD Proxy Mode
qi
Set the per-VLAN Query Interval
qri
Set the per-VLAN Query Response Interval
querier
Enable/Disable the per-VLAN MLD Querier
router
Set Router Port
rv
Set the per-VLAN Robustness Variable
show
Show MLD Information
snooping
Set MLD Snooping Mode
ssm-range
Set MLD SSM Range