Introduction to multicast ····································································································································· 1

Information transmission techniques ·········································································································· 1

Multicast features ······································································································································· 3

Common notations in multicast ·················································································································· 4

Multicast benefits and applications ············································································································ 4

Multicast models ················································································································································ 4

Multicast architecture ········································································································································· 5

Multicast addresses ··································································································································· 5

Multicast protocols ····································································································································· 9

Multicast packet forwarding mechanism ·········································································································· 11

Multicast support for VPNs ······························································································································ 11

Introduction to VPN instances ·················································································································· 11

Multicast application in VPNs ··················································································································· 12

Configuring multicast routing and forwarding ················································ 13

Overview ·························································································································································· 13

RPF check mechanism ···························································································································· 13

Static multicast routes ······························································································································ 15

Multicast forwarding across unicast subnets ···························································································· 16

Configuration task list ······································································································································· 17

Enabling IP multicast routing ··························································································································· 17

Configuring multicast routing and forwarding ··································································································· 18

Configuring static multicast routes ··········································································································· 18

Specifying the longest prefix match principle ··························································································· 18

Configuring multicast load splitting ··········································································································· 19

Configuring a multicast forwarding boundary ··························································································· 19

Delivering packets that fail the RPF check to the CPU ············································································ 19

Displaying and maintaining multicast routing and forwarding ·········································································· 20

Multicast routing and forwarding configuration examples ················································································ 22

Changing an RPF route ··························································································································· 22

Creating an RPF route ····························································································································· 24

Multicast forwarding over a GRE tunnel ··································································································· 26

Multicast forwarding over ADVPN tunnels ······························································································· 28

Troubleshooting multicast routing and forwarding ··························································································· 34

Static multicast route failure ····················································································································· 34

Configuring IGMP ························································································· 36

IGMPv1 overview ····································································································································· 36

IGMPv2 enhancements ···························································································································· 37

IGMPv3 enhancements ···························································································································· 38

IGMP SSM mapping ································································································································ 39

IGMP proxying ········································································································································· 40

Multicast access control ··························································································································· 41

IGMP support for VPNs ···························································································································· 41

Protocols and standards ·························································································································· 42

IGMP configuration task list ····························································································································· 42

Configuring basic IGMP features ····················································································································· 42

Enabling IGMP ········································································································································· 42

Specifying an IGMP version ····················································································································· 43

Configuring a static group member ·········································································································· 43

Configuring a multicast group policy ········································································································ 44

Adjusting IGMP performance ··························································································································· 44

Configuring IGMP query and response parameters ················································································· 44

Enabling fast-leave processing ················································································································ 46

Configuring IGMP SSM mappings ··················································································································· 47