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ES-2724 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.
Содержание ZyXEL Dimension ES-2724
Страница 1: ...ES 2724 Intelligent Layer 3 Switch User s Guide Version 3 70 9 2006...
Страница 2: ......
Страница 7: ...ES 2724 User s Guide Safety Warnings 5 This product is recyclable Dispose of it properly...
Страница 22: ...ES 2724 User s Guide 20 Table of Contents...
Страница 30: ...ES 2724 User s Guide 28 List of Tables...
Страница 36: ...ES 2724 User s Guide 34 Chapter 1 Getting to Know Your Switch...
Страница 40: ...ES 2724 User s Guide 38 Chapter 2 Hardware Installation and Connection...
Страница 48: ...ES 2724 User s Guide 46 Chapter 3 Hardware Overview...
Страница 58: ...ES 2724 User s Guide 56 Chapter 4 The Web Configurator...
Страница 64: ...ES 2724 User s Guide 62 Chapter 5 Initial Setup Example...
Страница 70: ...ES 2724 User s Guide 68 Chapter 6 System Status and Port Statistics...
Страница 82: ...ES 2724 User s Guide 80 Chapter 7 Basic Setting...
Страница 95: ...ES 2724 User s Guide Chapter 8 VLAN 93 Figure 39 Port Based VLAN Setup All Connected...
Страница 96: ...ES 2724 User s Guide 94 Chapter 8 VLAN Figure 40 Port Based VLAN Setup Port Isolation...
Страница 98: ...ES 2724 User s Guide 96 Chapter 8 VLAN...
Страница 107: ...ES 2724 User s Guide Chapter 11 Spanning Tree Protocol 105 Figure 45 RSTP Configuration...
Страница 114: ...ES 2724 User s Guide 112 Chapter 11 Spanning Tree Protocol...
Страница 126: ...ES 2724 User s Guide 124 Chapter 15 Link Aggregation...
Страница 132: ...ES 2724 User s Guide 130 Chapter 16 Port Authentication...
Страница 136: ...ES 2724 User s Guide 134 Chapter 17 Port Security...
Страница 142: ...ES 2724 User s Guide 140 Chapter 18 Classifier Figure 61 Classifier Example...
Страница 148: ...ES 2724 User s Guide 146 Chapter 19 Policy Rule Figure 64 Policy Example...
Страница 151: ...ES 2724 User s Guide Chapter 20 Queuing Method 149 Figure 65 Queuing Method...
Страница 158: ...ES 2724 User s Guide 156 Chapter 21 VLAN Stacking...
Страница 189: ...ES 2724 User s Guide Chapter 28 DHCP 187 Figure 93 DHCP Relay Configuration Example...
Страница 190: ...ES 2724 User s Guide 188 Chapter 28 DHCP...
Страница 210: ...ES 2724 User s Guide 208 Chapter 30 Access Control...
Страница 212: ...ES 2724 User s Guide 210 Chapter 31 Diagnostic...
Страница 216: ...ES 2724 User s Guide 214 Chapter 32 Syslog...
Страница 224: ...ES 2724 User s Guide 222 Chapter 33 Cluster Management...
Страница 232: ...ES 2724 User s Guide 230 Chapter 37 Routing Table...
Страница 268: ...ES 2724 User s Guide 266 Chapter 39 Introducing Commands...
Страница 276: ...ES 2724 User s Guide 274 Chapter 40 User and Enable Mode Commands...
Страница 290: ...ES 2724 User s Guide 288 Chapter 41 Configuration Mode Commands...
Страница 306: ...ES 2724 User s Guide 304 Chapter 43 IEEE 802 1Q Tagged VLAN Commands...
Страница 310: ...ES 2724 User s Guide 308 Chapter 45 Routing Domain Command Examples...
Страница 320: ...ES 2724 User s Guide 318 Chapter 46 Troubleshooting...
Страница 326: ...ES 2724 User s Guide 324 Appendix A Product Specifications...