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I pv4 multicast

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  • 1. IPV4 MULTICAST packetlife.net Layer 2 Addressing Group Ranges 239.142.57.6 224.0.0.0/24 Local network control 11101111 10001110 00111001 00000110 224.0.1.0/24 Internetwork control 01-00-5E-0E-39-06 232.0.0.0/8 Source-specific 00000001 00000000 01011110 00001110 00111001 00000110 233.0.0.0/8 GLOP (RFC 3180) 239.0.0.0/8 Admin-scoped TerminologyReverse Path Forwarding (RPF) Common GroupsVerifies that multicast traffic travels in the reverse direction of 224.0.0.1 All hostsunicast traffic, away from the tree root 224.0.0.2 All routersCisco Group Management Protocol (CGMP)A proprietary protocol used by switches to obtain multicast 224.0.1.39 Cisco RP Announcemembership information for end hosts (deprecated) 224.0.1.40 Cisco RP DiscoveryInternet Group Management Protocol (IGMP)Hosts send IGMP requests to local routers to join multicast groups Distribution Trees Shared IGMP Configuration A common set of links which carry all IGMP Support Router(config-if)# ip igmp [version <#>] multicast traffic; statically configured Source-Rooted IGMP Snooping Switch(config)# ip igmp snooping Provides the shortest paths from the Protocol Independent Multicast (PIM) source to receiversDense Mode IGMPThe initial tree encompasses all multicast routers; after a period oftime, routers without IGMP members prune back branches IGMPv1 Original IGMP specificationSparse ModeThe tree is grown from a central rendezvous point out to the IGMPv2multicast source and recipients Adds support for dynamic leave requests and querier election to original IGMPSparse-Dense ModeAllows a PIM-enabled interface to function in either sparse or dense IGMPv3mode per group Adds multicast source filtering to v2PIMv1 IGMP SnoopingProvides automatic RP discovery with Auto-RP (Cisco proprietary) A switch passively inspects IGMP requests to determine which hostsPIMv2 should receive multicast trafficAutomatic RP discovery is accomplished by the bootstrap router(BSR) method (standard) IGMP Troubleshooting PIM Configuration show ip igmp show ip igmp groupip multicast-routing! show ip igmp interfaceinterface FastEthernet0/0 ip pim {sparse-mode | dense-mode | sparse-dense-mode} show ip igmp snooping ip pim version {1 | 2} ip igmp join-group RP Configuration PIM Troubleshooting Manual ip pim rp-address <IP> show ip mrouteAuto-RP Mapping Agent ip pim send-rp-discovery scope <TTL> show ip pim interface Auto-RP Candidate ip pim send-rp-announce <interface> show ip pim neighbor BSR Candidate ip pim bsr-candidate <interface> show ip pim rp [mapping] BSR RP Candidate ip pim rp-candidate <interface> show ip rpf <IP>by Jeremy Stretch v2.0

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