ii
Static port configuration example ······················································································································· 35
IGMP snooping querier configuration example ································································································· 38
IGMP snooping proxying configuration example ······························································································ 40
Troubleshooting IGMP snooping ·································································································································· 43
Layer 2 multicast forwarding cannot function ···································································································· 43
Configured multicast group policy fails to take effect ······················································································· 43
Appendix ········································································································································································ 44
Processing of multicast protocol messages ········································································································· 44
Configuring multicast VLANs ····································································································································· 45
Overview ········································································································································································· 45
Multicast VLAN configuration task list ························································································································· 47
Configuring a sub-VLAN-based multicast VLAN ········································································································· 47
Configuration guidelines ······································································································································ 47
Configuration procedure ······································································································································ 47
Configuring a port-based multicast VLAN ··················································································································· 48
Configuration prerequisites ·································································································································· 48
Configuring user port attributes ··························································································································· 48
Configuring multicast VLAN ports ······················································································································· 49
Displaying and maintaining multicast VLAN ··············································································································· 49
Multicast VLAN configuration examples ······················································································································ 50
Sub-VLAN-based multicast VLAN configuration example ················································································· 50
Port-based multicast VLAN configuration example ···························································································· 54
Configuring multicast routing and forwarding ········································································································· 57
Overview ········································································································································································· 57
RPF check mechanism ··········································································································································· 57
Static multicast routes ············································································································································ 59
Multicast forwarding across unicast subnets ······································································································ 61
Multicast traceroute ··············································································································································· 61
Configuration task list ···················································································································································· 62
Enabling IP multicast routing ········································································································································· 62
Configuring multicast routing and forwarding ············································································································ 63
Configuring static multicast routes ······················································································································· 63
Configuring a multicast routing policy ················································································································ 63
Configuring a multicast forwarding range ········································································································· 64
Configuring the multicast forwarding table size ································································································ 64
Tracing a multicast path ······································································································································· 65
Displaying and maintaining multicast routing and forwarding ················································································· 65
Configuration examples ················································································································································ 66
Changing an RPF route ········································································································································· 66
Creating an RPF route ··········································································································································· 68
Multicast forwarding over a tunnel ······················································································································ 70
Troubleshooting multicast routing and forwarding ····································································································· 74
Static multicast route failure ································································································································· 74
Multicast data fails to reach receivers················································································································· 74
Configuring IGMP ······················································································································································ 76
Overview ········································································································································································· 76
IGMP versions ························································································································································ 76
Introduction to IGMPv1 ········································································································································· 76
Enhancements in IGMPv2····································································································································· 78
Enhancements in IGMPv3····································································································································· 78
IGMP SSM mapping ············································································································································· 80
IGMP proxying ······················································································································································ 81
Protocols and standards ······································································································································· 82
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