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OLT-1308 Series User’s Guide
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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.
Summary of Contents for OLT-1308
Page 2: ......
Page 7: ...Safety Warnings OLT 1308 Series User s Guide 7 ...
Page 8: ...Safety Warnings OLT 1308 Series User s Guide 8 ...
Page 28: ...List of Tables OLT 1308 Series User s Guide 28 ...
Page 30: ...30 ...
Page 34: ...Chapter 1 Introducing the OLT OLT 1308 Series User s Guide 34 ...
Page 38: ...Chapter 2 Hardware Installation and Connection OLT 1308 Series User s Guide 38 ...
Page 44: ...44 ...
Page 58: ...Chapter 5 Initial Setup Example OLT 1308 Series User s Guide 58 ...
Page 72: ...Chapter 6 System Status and Port Statistics OLT 1308 Series User s Guide 72 ...
Page 94: ...Chapter 7 Basic Setting OLT 1308 Series User s Guide 94 ...
Page 96: ...96 ...
Page 106: ...Chapter 8 VLAN OLT 1308 Series User s Guide 106 ...
Page 116: ...Chapter 11 Spanning Tree Protocol OLT 1308 Series User s Guide 116 ...
Page 126: ...Chapter 15 Link Aggregation OLT 1308 Series User s Guide 126 ...
Page 132: ...Chapter 17 Queuing Method OLT 1308 Series User s Guide 132 ...
Page 138: ...Chapter 18 Classifier OLT 1308 Series User s Guide 138 ...
Page 143: ...Chapter 19 Policy OLT 1308 Series User s Guide 143 Figure 53 Policy Example ...
Page 144: ...Chapter 19 Policy OLT 1308 Series User s Guide 144 ...
Page 158: ...158 ...
Page 162: ...Chapter 22 Classification Filter Profile OLT 1308 Series User s Guide 162 ...
Page 172: ...Chapter 23 VLAN Profile OLT 1308 Series User s Guide 172 ...
Page 184: ...Chapter 26 Destination Filter OLT 1308 Series User s Guide 184 ...
Page 188: ...Chapter 27 Port Authentication OLT 1308 Series User s Guide 188 ...
Page 190: ...190 ...
Page 200: ...Chapter 29 Maintenance OLT 1308 Series User s Guide 200 ...
Page 212: ...Chapter 30 Access Control OLT 1308 Series User s Guide 212 ...
Page 218: ...Chapter 32 Syslog OLT 1308 Series User s Guide 218 ...
Page 224: ...Chapter 33 Cluster Management OLT 1308 Series User s Guide 224 ...
Page 228: ...Chapter 34 MAC Table OLT 1308 Series User s Guide 228 ...
Page 232: ...Chapter 36 IGMP Table OLT 1308 Series User s Guide 232 ...
Page 234: ...234 ...
Page 285: ...Chapter 38 Command Examples OLT 1308 Series User s Guide 285 ...
Page 286: ...Chapter 38 Command Examples OLT 1308 Series User s Guide 286 ...
Page 294: ...Chapter 39 Troubleshooting OLT 1308 Series User s Guide 294 ...
Page 296: ...296 ...
Page 302: ...Appendix B Legal Information OLT 1308 Series User s Guide 302 ...