Supermicro SSE-G2252 User Manual page 491

• 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.
• 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:
• Multicast forwarding is disabled on an interface.
• An interface is administratively disabled.
• 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 in the web interface:
• VLAN – ID of configured VLANs. (Range: 1-4093)
• 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
Query Parameters" on page
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.
• 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)
"Configuring IGMP Snooping and
18-4), the per VLAN interface settings for IGMP
18-13
Chapter 18: Multicast Filtering