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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On receipt of a Solicitation message.
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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.
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Multicast Router Termination – These messages are sent when a router stops IP multicast
routing functions on an interface. Termination messages are sent by multicast routers when:
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Multicast forwarding is disabled on an interface.
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An interface is administratively disabled.
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The router is gracefully shut down.
Advertisement and Termination messages are sent to the All-Snoopers multicast address.
Solicitation messages are sent to the All-Routers multicast address.
NOTE
MRD messages are flooded to all ports in a VLAN where IGMP snooping or routing has been enabled.
To ensure that older switches which do not support MRD can also learn the multicast router port,
the switch floods IGMP general query packets, which do not have a null source address (0.0.0.0), to
all ports in the attached VLAN. IGMP packets with a null source address are only flooded to all ports
in the VLAN if the system is operating in multicast flooding mode, such as when a new VLAN or new
router port is being established, or an spanning tree topology change has occurred. Otherwise, this
kind of packet is only forwarded to known multicast routing ports.
Parameters
These parameters are displayed:
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VLAN – ID of configured VLANs. (Range: 1-4093)
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IGMP Snooping Status – When enabled, the switch will monitor network traffic on the indicated
VLAN interface to determine which hosts want to receive multicast traffic. This is referred to as
IGMP Snooping. (Default: Disabled)
When IGMP snooping is enabled globally (see
), the per VLAN interface settings for
IGMP snooping take precedence.
When IGMP snooping is disabled globally, snooping can still be configured per VLAN interface,
but the interface settings will not take effect until snooping is re-enabled globally.
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Version Exclusive – Discards any received IGMP messages (except for multicast protocol
packets) which use a version different to that currently configured by the IGMP Version
attribute. (Default: Disabled)
If version exclusive is disabled on a VLAN, then this setting is based on the global setting
configured on the Multicast > IGMP Snooping > General page. If it is enabled on a VLAN, then
this setting takes precedence over the global setting.
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Immediate Leave Status – Immediately deletes a member port of a multicast service if a leave
packet is received at that port and immediate leave is enabled for the parent VLAN. (Default:
Disabled)