Multicast AddressingMulticast Addressing

Permanent multicast groups, in the range 224.0.0.0–224.0.1.255

Addresses used with Source-Specific Multicast (SSM), in the range 232.0.0.0–

232.255.255.255GLOP addressing, in the range

233.0.0.0–233.255.255.255Private multicast addresses, in the

range 239.0.0.0–239.255.255.255

PIM Multicast Routing PIM Multicast Routing ProtocolsProtocols

PIM Dense Mode PIM Sparse Mode

PIM Dense Core - PIM Dense Core - ConsiderationsConsiderations

RPF failureRPF failure

– – Incoming interface for multicast must Incoming interface for multicast must match outgoing interface for unicastmatch outgoing interface for unicast

NBMA mode problemNBMA mode problem

– – Unlikely in SP networks, links Unlikely in SP networks, links typically P2Ptypically P2P

Configuring PIM Dense CoreConfiguring PIM Dense Core

Enable multicastEnable multicast

– – ip multicast-routingip multicast-routingEnable PIM on interfacesEnable PIM on interfaces

– – ip pim dense-modeip pim dense-mode

Verifying PIM Dense CoreVerifying PIM Dense Core Verify AdjacenciesVerify Adjacencies– – show ip pim neighborshow ip pim neighbor Simulate client joinsSimulate client joins– – ip igmp join…ip igmp join…– – ip igmp static…ip igmp static… Simulate sourceSimulate source– – PingPing– – IP SLAIP SLA Verify transportVerify transport– – show ip mroute countshow ip mroute count– – debug ip mpacketdebug ip mpacket no ip mroute-cacheno ip mroute-cache

PIM Sparse Core - PIM Sparse Core - ConsiderationsConsiderations

How is the RP assigned?How is the RP assigned?– – StaticStatic– – Auto-RPAuto-RP a.Sparse-dense modea.Sparse-dense mode b. Sparse mode onlyb. Sparse mode only Default RP assignmentDefault RP assignment Auto-RP listenerAuto-RP listener c. RPF failure from mapping agent or candidate RPc. RPF failure from mapping agent or candidate RP– – BSRBSR– – Anycast (more later…)Anycast (more later…) RPF failureRPF failure NBMA mode problemNBMA mode problem

Verifying PIM Sparse CoreVerifying PIM Sparse Core

Verify AdjacenciesVerify Adjacencies– – show ip pim neighborshow ip pim neighbor Verify PIM joinsVerify PIM joins– – ip igmp join…ip igmp join…– – ip igmp static…ip igmp static…– – debug ip pim debug ip pim on RPon RP Verify source registrationVerify source registration– – PingPing– – IP SLAIP SLA– – debug ip pim debug ip pim on RPon RP Verify transportVerify transport– – show ip mroute countshow ip mroute count– – debug ip mpacketdebug ip mpacket no ip mroute-cacheno ip mroute-cache

Configuring PIM Sparse CoreConfiguring PIM Sparse Core

Enable multicastEnable multicast– – ip multicast-routingip multicast-routing Enable PIM on interfacesEnable PIM on interfaces– – ip pim sparse-modeip pim sparse-mode– – ip pim sparse-dense-modeip pim sparse-dense-mode Configure RP assignmentConfigure RP assignment– – StaticStatic– – Auto-RPAuto-RP– – BSRBSR

MSDPMSDP

RPs in different ASes peer via MSDPRPs in different ASes peer via MSDP– – TCP transport requiredTCP transport required When a source registers with the RP itWhen a source registers with the RP itgenerates Source Active (SA) messagesgenerates Source Active (SA) messagesto MSDP peersto MSDP peers Allows other ASes to know what sendersAllows other ASes to know what sendersthere are in the Internetthere are in the Internet If local RP has a (*,G) entry for a client itIf local RP has a (*,G) entry for a client itforwards PIM join up RPF tree towardsforwards PIM join up RPF tree towardsremote RPremote RP

Multicast BGPMulticast BGP

Multicast BGP propagates sourceMulticast BGP propagates sourceadvertisements solely for purpose of RPFadvertisements solely for purpose of RPFcheckcheckLike static mroutes but dynamicLike static mroutes but dynamicMulticast BGP preferred over Unicast BGPMulticast BGP preferred over Unicast BGPfor RPFfor RPFEnabled through MP-BGP Enabled through MP-BGP address-familyaddress-familyipv4 multicastipv4 multicast

Multicast BGP ConfigurationMulticast BGP Configuration

Configure BGP peersConfigure BGP peersActivate multicast address familyActivate multicast address familyAdvertise multicast sourcesAdvertise multicast sourcesVerify new RPFVerify new RPF

– – show ip rpf show ip rpf w.x.y.zw.x.y.z

Anycast RPAnycast RP

Goal:Goal:– – Distribute RP load to multiple devicesDistribute RP load to multiple devices– – Simplify failover and reduce convergence Simplify failover and reduce convergence

timetimewhen an RP failswhen an RP failsHow:How:– – Multiple RPs share the same IP addressMultiple RPs share the same IP address Typically /32 LoopbackTypically /32 Loopback– – Join and register messages sent to closestJoin and register messages sent to closest RP based on IGP metricRP based on IGP metric