Multicast overview ······················································································································································· 1

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

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

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

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

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

Multicast models ································································································································································ 5

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

Multicast addresses ·················································································································································· 6

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

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

Configuring IGMP snooping ····································································································································· 13

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

Basic concepts in IGMP snooping ······················································································································· 13

How IGMP snooping works ································································································································· 15

Protocols and standards ······································································································································· 16

IGMP snooping configuration task list ························································································································· 16

Configuring basic IGMP snooping functions ·············································································································· 17

Enabling IGMP snooping ····································································································································· 17

Specifying the IGMP snooping version ··············································································································· 18

Setting the maximum number of IGMP snooping forwarding entries ······························································ 18

Configuring parameters for IGMP queries and responses ··············································································· 18

Configuring IGMP snooping port functions ················································································································· 19

Setting aging timers for dynamic ports ··············································································································· 19

Configuring static ports ········································································································································· 20

Enabling IGMP snooping fast-leave processing ································································································· 21

Configuring IGMP snooping policies ··························································································································· 22

Configuring a multicast group filter ····················································································································· 22

Configuring multicast source port filtering ·········································································································· 22

Enabling dropping unknown multicast data ······································································································· 23

Setting the maximum number of multicast groups on a port ············································································ 23

Enabling the multicast group replacement function ··························································································· 24

Displaying and maintaining IGMP snooping ·············································································································· 25

IGMP snooping configuration examples ····················································································································· 25

Group policy configuration example ·················································································································· 25

Static port configuration example ······················································································································· 27

Troubleshooting IGMP snooping ·································································································································· 30

Layer 2 multicast forwarding cannot function ···································································································· 30

Multicast group filter does not work ···················································································································· 30

Configuring multicast routing and forwarding ········································································································· 32

RPF check mechanism ··········································································································································· 32

Static multicast routes ············································································································································ 34

Multicast forwarding across unicast subnets ······································································································ 36

Configuration task list ···················································································································································· 36

Enabling IP multicast routing ········································································································································· 37

Configuring multicast routing and forwarding ············································································································ 37

Configuring static multicast routes ······················································································································· 37