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Chapter 14
| Multicast Filtering
Layer 2 IGMP (Snooping and Query for IPv4)
– 537 –
Setting IGMP
Snooping Status
per Interface
Use the Multicast > IGMP Snooping > Interface (Configure VLAN) page to configure
IGMP snooping attributes for a VLAN. To configure snooping globally, refer to
“Configuring IGMP Snooping and Query Parameters” on page 528
Command Usage
Multicast Router Discovery
There have been many mechanisms used in the past to identify multicast routers.
This has lead to interoperability issues between multicast routers and snooping
switches from different vendors. In response to this problem, the Multicast Router
Discovery (MRD) protocol has been developed for use by IGMP snooping and
multicast routing devices. MRD is used to discover which interfaces are attached to
multicast routers, allowing IGMP-enabled devices to determine where to send
multicast source and group membership messages. (MRD is specified in draft-ietf-
magma-mrdisc-07.)
Multicast source data and group membership reports must be received by all
multicast routers on a segment. Using the group membership protocol query
messages to discover multicast routers is insufficient due to query suppression.
MRD therefore provides a standardized way to identify multicast routers without
relying on any particular multicast routing protocol.
Note:
The default values recommended in the MRD draft are implemented in the
switch.
Multicast Router Discovery uses the following three message types to discover
multicast routers:
◆
Multicast Router Advertisement – Advertisements are sent by routers to
advertise that IP multicast forwarding is enabled. These messages are sent
unsolicited periodically on all router interfaces on which multicast forwarding
is enabled. They are sent upon the occurrence of these events:
■
Upon the expiration of a periodic (randomized) timer.
■
As a part of a router's start up procedure.
■
During the restart of a multicast forwarding interface.
■
On receipt of a Solicitation message.
◆
Multicast Router Solicitation – Devices send Solicitation messages in order to
solicit Advertisement messages from multicast routers. These messages are
used to discover multicast routers on a directly attached link. Solicitation
messages are also sent whenever a multicast forwarding interface is initialized
or re-initialized. Upon receiving a solicitation on an interface with IP multicast
forwarding and MRD enabled, a router will respond with an Advertisement.
Summary of Contents for GTL-2881
Page 34: ...Section I Getting Started 34 ...
Page 48: ...Section II Web Configuration 48 Unicast Routing on page 651 ...
Page 151: ...Chapter 4 Interface Configuration VLAN Trunking 151 Figure 69 Configuring VLAN Trunking ...
Page 152: ...Chapter 4 Interface Configuration VLAN Trunking 152 ...
Page 230: ...Chapter 8 Congestion Control Automatic Traffic Control 230 ...
Page 596: ...Chapter 14 Multicast Filtering Multicast VLAN Registration for IPv6 596 ...
Page 620: ...Chapter 15 IP Configuration Setting the Switch s IP Address IP Version 6 620 ...
Page 672: ...Section III Appendices 672 ...
Page 678: ...Appendix A Software Specifications Management Information Bases 678 ...
Page 688: ...Appendix C License Statement GPL Code Statement Notification of Compliance 688 ...
Page 696: ...Glossary 696 ...
Page 706: ...GTL 2881 GTL 2882 E112016 ST R01 ...