Lenovo Flex System Fabric CN4093 User Manual

© Copyright Lenovo 2017 497
Chapter 31. Protocol Independent Multicast
EnterpriseNOSsupportsProtocolIndependentMulticast(PIM)inSparseMode
(PIM‐SM)andDenseMode(PIM‐DM).
Note: EnterpriseNOS8.4doesnotsupportIPv6forPIM.
ThefollowingsectionsdiscussPIMsupportfortheCN409310GbConverged
ScalableSwitch:
 “PIMOverview”onpage 497
 “SupportedPIMModesandFeatures”onpage 498
 “BasicPIMSettings”onpage 499
 “AdditionalSparseModeSettings”onpage 502
 “UsingPIMwithOtherFeatures”onpage 504
 “PIMConfigurationExamples”onpage 505
PIM Overview
PIMisdesignedfor efficientlyroutingmulticasttrafficacross oneormoreIPv4
domains.ThishasbenefitsforapplicationsuchasIPtelevision,collaboration,
education,andsoftwaredelivery,whereasinglesourcemustdelivercontent(a
multicast)toagroupofreceiversthatspanbothwide‐areaandinter‐domain
networks.
Insteadofsendingaseparatecopyofcontenttoeachreceiver,amulticastde rives
efficiencybysendingonlyasinglecopyofcontenttowarditsintendedreceivers.
Thissinglecopyonlybecomesduplicatedwhenitreachesthetargetdomainthat
includesmultiplereceivers,orwhenitreachesanecessarybifurcationpoint

leadingtodifferentreceiverdomains.
PIMisusedbymulticastsourcestations,clientreceivers,andintermediaryrouters
andswitches,tobuildandmaintainefficientmulticastroutingtrees.PIMis
protocolindependent;Itcollectsroutinginformationusingtheexistingunicast
routingfunctionsunderlyingtheIPv4network,butdoesnotrelyonany
particular 
unicastprotocol.ForPIMtofunction,aLaye r3routing protocol(suchasBGP,
OSPF,RIP,orstaticroutes)mustfirstbeconfiguredontheswitch.
PIM‐SMisareverse‐pathroutingmechanism.Clientreceiverstationsadvertise
theirwillingnesstojoinamulticastgroup.Thelocalroutingand switching
devices
collectmulticastroutinginformationand forwardtherequesttowardthestation
thatwillprovidethemulticastcontent.Whenthejoinrequestsreachthesending
station,themulticastdataissenttowardthereceivers,flowingintheopposite
directionoftheoriginaljoinrequests.
Someroutingandswitchingdevicesperformspecial
PIM‐SMfunctions.Within
eachreceiverdomain,onerouteriselectedastheDesignatedRouter(DR)for
handlingmulticastsforthedomain.DRsforwardinformationtoasimilardevice,
theRendezvousPoint(RP),whichholdstheroottreefortheparticularmulticast
group.

Lenovo Flex System Fabric CN4093 Specifications

General

Brand	Lenovo
Model	Flex System Fabric CN4093
Category	Switch
Language	English