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ES-4124 User’s Guide
Chapter 22 Multicast
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H A P T E R
22
Multicast
This chapter shows you how to configure various multicast features.
22.1 Multicast Overview
Traditionally, IP packets are transmitted in one of either two ways - Unicast (1 sender to 1
recipient) or Broadcast (1 sender to everybody on the network). Multicast delivers IP packets
to just a group of hosts on the network.
IGMP (Internet Group Multicast Protocol) is a network-layer protocol used to establish
membership in a multicast group - it is not used to carry user data. Refer to RFC 1112 and
RFC 2236 for information on IGMP versions 1 and 2 respectively.
22.1.1 IP Multicast Addresses
In IPv4, a multicast address allows a device to send packets to a specific group of hosts
(multicast group) in a different subnetwork. A multicast IP address represents a traffic
receiving group, not individual receiving devices. IP addresses in the Class D range (224.0.0.0
to 239.255.255.255) are used for IP multicasting. Certain IP multicast numbers are reserved by
IANA for special purposes (see the IANA web site for more information).
22.1.2 IGMP Filtering
With the IGMP filtering feature, you can control which IGMP groups a subscriber on a port
can join. This allows you to control the distribution of multicast services (such as content
information distribution) based on service plans and types of subscription.
You can set the switch to filter the multicast group join reports on a per-port basis by
configuring an IGMP filtering profile and associating the profile to a port.
22.1.3 IGMP Snooping
A switch can passively snoop on IGMP Query, Report and Leave (IGMP version 2) packets
transferred between IP multicast routers/switches and IP multicast hosts to learn the IP
multicast group membership. It checks IGMP packets passing through it, picks out the group
registration information, and configures multicasting accordingly. IGMP snooping allows the
switch to learn multicast groups without you having to manually configure them.
Summary of Contents for Dimension ES-4124
Page 1: ...ES 4124 Intelligent Layer 3 Switch User s Guide Version 3 70 8 2006...
Page 2: ......
Page 7: ...ES 4124 User s Guide Safety Warnings 5 This product is recyclable Dispose of it properly...
Page 36: ...ES 4124 User s Guide 34 Chapter 1 Getting to Know Your Switch...
Page 40: ...ES 4124 User s Guide 38 Chapter 2 Hardware Installation and Connection...
Page 48: ...ES 4124 User s Guide 46 Chapter 3 Hardware Overview...
Page 58: ...ES 4124 User s Guide 56 Chapter 4 The Web Configurator...
Page 64: ...ES 4124 User s Guide 62 Chapter 5 Initial Setup Example...
Page 70: ...ES 4124 User s Guide 68 Chapter 6 System Status and Port Statistics...
Page 82: ...ES 4124 User s Guide 80 Chapter 7 Basic Setting...
Page 95: ...ES 4124 User s Guide Chapter 8 VLAN 93 Figure 39 Port Based VLAN Setup All Connected...
Page 96: ...ES 4124 User s Guide 94 Chapter 8 VLAN Figure 40 Port Based VLAN Setup Port Isolation...
Page 98: ...ES 4124 User s Guide 96 Chapter 8 VLAN...
Page 107: ...ES 4124 User s Guide Chapter 11 Spanning Tree Protocol 105 Figure 45 RSTP Configuration...
Page 114: ...ES 4124 User s Guide 112 Chapter 11 Spanning Tree Protocol...
Page 126: ...ES 4124 User s Guide 124 Chapter 15 Link Aggregation...
Page 132: ...ES 4124 User s Guide 130 Chapter 16 Port Authentication...
Page 136: ...ES 4124 User s Guide 134 Chapter 17 Port Security...
Page 142: ...ES 4124 User s Guide 140 Chapter 18 Classifier Figure 61 Classifier Example...
Page 149: ...ES 4124 User s Guide Chapter 19 Policy Rule 147 Figure 64 Policy Example...
Page 150: ...ES 4124 User s Guide 148 Chapter 19 Policy Rule...
Page 153: ...ES 4124 User s Guide Chapter 20 Queuing Method 151 Figure 65 Queuing Method...
Page 160: ...ES 4124 User s Guide 158 Chapter 21 VLAN Stacking...
Page 236: ...ES 4124 User s Guide 234 Chapter 33 Access Control...
Page 238: ...ES 4124 User s Guide 236 Chapter 34 Diagnostic...
Page 242: ...ES 4124 User s Guide 240 Chapter 35 Syslog...
Page 250: ...ES 4124 User s Guide 248 Chapter 36 Cluster Management...
Page 258: ...ES 4124 User s Guide 256 Chapter 40 Routing Table...
Page 306: ...ES 4124 User s Guide 304 Chapter 43 User and Enable Mode Commands...
Page 320: ...ES 4124 User s Guide 318 Chapter 44 Configuration Mode Commands...
Page 336: ...ES 4124 User s Guide 334 Chapter 46 IEEE 802 1Q Tagged VLAN Commands...
Page 340: ...ES 4124 User s Guide 338 Chapter 48 Routing Domain Command Examples...
Page 350: ...ES 4124 User s Guide 348 Chapter 49 Troubleshooting...
Page 356: ...ES 4124 User s Guide 354 Appendix A Product Specifications...