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OLT-1308 Series User’s Guide
145
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H A P T E R
20
Multicast
This chapter shows you how to configure various multicast features.
20.1 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 session-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.
See
to configure multicast.
20.1.1 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).
20.1.2 IGMP Filtering
With IGMP filtering, 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.
20.1.3 IGMP Snooping
A layer-2 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.
Without IGMP snooping, multicast traffic is treated in the same manner as broadcast traffic,
you can configure the switch to forward or discard unknown multicast group traffic. With
IGMP snooping, group multicast traffic is only forwarded to ports that are members of that
group. IGMP snooping generates no additional network traffic, allowing you to significantly
reduce multicast traffic passing through your switch.
Содержание OLT-1308
Страница 1: ...www zyxel com OLT 1308 Series Optical Line Terminal User s Guide Version 3 60 1 2007 Edition 1 ...
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Страница 7: ...Safety Warnings OLT 1308 Series User s Guide 7 ...
Страница 8: ...Safety Warnings OLT 1308 Series User s Guide 8 ...
Страница 28: ...List of Tables OLT 1308 Series User s Guide 28 ...
Страница 29: ...29 PART I Introduction Introducing the OLT 31 Hardware Installation and Connection 35 Hardware Overview 39 ...
Страница 30: ...30 ...
Страница 34: ...Chapter 1 Introducing the OLT OLT 1308 Series User s Guide 34 ...
Страница 38: ...Chapter 2 Hardware Installation and Connection OLT 1308 Series User s Guide 38 ...
Страница 44: ...44 ...
Страница 58: ...Chapter 5 Initial Setup Example OLT 1308 Series User s Guide 58 ...
Страница 72: ...Chapter 6 System Status and Port Statistics OLT 1308 Series User s Guide 72 ...
Страница 94: ...Chapter 7 Basic Setting OLT 1308 Series User s Guide 94 ...
Страница 96: ...96 ...
Страница 106: ...Chapter 8 VLAN OLT 1308 Series User s Guide 106 ...
Страница 116: ...Chapter 11 Spanning Tree Protocol OLT 1308 Series User s Guide 116 ...
Страница 126: ...Chapter 15 Link Aggregation OLT 1308 Series User s Guide 126 ...
Страница 132: ...Chapter 17 Queuing Method OLT 1308 Series User s Guide 132 ...
Страница 138: ...Chapter 18 Classifier OLT 1308 Series User s Guide 138 ...
Страница 143: ...Chapter 19 Policy OLT 1308 Series User s Guide 143 Figure 53 Policy Example ...
Страница 144: ...Chapter 19 Policy OLT 1308 Series User s Guide 144 ...
Страница 158: ...158 ...
Страница 162: ...Chapter 22 Classification Filter Profile OLT 1308 Series User s Guide 162 ...
Страница 172: ...Chapter 23 VLAN Profile OLT 1308 Series User s Guide 172 ...
Страница 184: ...Chapter 26 Destination Filter OLT 1308 Series User s Guide 184 ...
Страница 188: ...Chapter 27 Port Authentication OLT 1308 Series User s Guide 188 ...
Страница 190: ...190 ...
Страница 200: ...Chapter 29 Maintenance OLT 1308 Series User s Guide 200 ...
Страница 212: ...Chapter 30 Access Control OLT 1308 Series User s Guide 212 ...
Страница 218: ...Chapter 32 Syslog OLT 1308 Series User s Guide 218 ...
Страница 224: ...Chapter 33 Cluster Management OLT 1308 Series User s Guide 224 ...
Страница 228: ...Chapter 34 MAC Table OLT 1308 Series User s Guide 228 ...
Страница 232: ...Chapter 36 IGMP Table OLT 1308 Series User s Guide 232 ...
Страница 233: ...233 PART VI Commands and Troubleshooting Introducing the Commands 235 Command Examples 271 Troubleshooting 287 ...
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Страница 285: ...Chapter 38 Command Examples OLT 1308 Series User s Guide 285 ...
Страница 286: ...Chapter 38 Command Examples OLT 1308 Series User s Guide 286 ...
Страница 294: ...Chapter 39 Troubleshooting OLT 1308 Series User s Guide 294 ...
Страница 295: ...295 PART VII Appendix and Index Product Specifications 297 Legal Information 299 Customer Support 303 Index 307 ...
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Страница 302: ...Appendix B Legal Information OLT 1308 Series User s Guide 302 ...
Страница 314: ...Index OLT 1308 Series User s Guide 314 ...