1 Multicast Overview ····································································································································1-1

Multicast Overview ··································································································································1-1

Information Transmission in the Unicast Mode ···············································································1-1

Information Transmission in the Broadcast Mode···········································································1-2

Information Transmission in the Multicast Mode·············································································1-3

Roles in Multicast ····························································································································1-3

Common Notations in Multicast·······································································································1-4

Advantages and Applications of Multicast·······················································································1-5

Multicast Models ·····································································································································1-5

Multicast Architecture······························································································································1-6

Multicast Address ····························································································································1-6

Multicast Protocols ··························································································································1-9

Multicast Packet Forwarding Mechanism ·····························································································1-10

Implementation of the RPF Mechanism ························································································1-11

RPF Check ····································································································································1-11

2 Common Multicast Configuration············································································································2-1

Common Multicast Configuration············································································································2-1

Enabling Multicast Packet Buffering································································································2-1

Enabling Multicast Routing··············································································································2-2

Configuring Limit on the Number of Route Entries··········································································2-2

Configuring Suppression on the Multicast Source Port···································································2-3

Clearing Multicast Forwarding and Routing Entries ········································································2-3

Configuring a Multicast MAC Address Entry ···················································································2-4

Configuring Dropping Unknown Multicast Packets ·········································································2-4

Tracing a Multicast Path ··················································································································2-5

Displaying and Maintaining Common Multicast Configuration································································2-5

3 IGMP Configuration ···································································································································3-1

IGMP Overview ·······································································································································3-1

IGMP Versions ································································································································3-1

Work Mechanism of IGMPv1···········································································································3-1

Enhancements Provided by IGMPv2 ······························································································3-3

Enhancements Provided by IGMPv3 ······························································································3-3

IGMP Proxy ·····································································································································3-5

Configuring IGMP····································································································································3-6

IGMP Configuration Task List ·········································································································3-6

Enabling IGMP ································································································································3-6

Configuring IGMP Version···············································································································3-7

Configuring Options Related to IGMP Query Messages·································································3-7

Configuring the Maximum Allowed Number of Multicast Groups····················································3-9

Configuring a Multicast Group Filter································································································3-9

Table of Contents