Setting igmp snooping status per interface, Figure 359 s – Brocade Communications Systems Brocate Ethernet Access Switch 6910 User Manual
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Brocade 6910 Ethernet Access Switch Configuration Guide
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Layer 2 IGMP (Snooping and Query)
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FIGURE 359
Showing Current Interfaces Assigned to a Multicast Service
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
CLI References
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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:
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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:
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Upon the expiration of a periodic (randomized) timer.
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As a part of a router's start up procedure.
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During the restart of a multicast forwarding interface.