LevelOne GTL-2691 - Manual (Page 1197)

C HAPTER 42 | Multicast Filtering Commands
IGMP Snooping
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D EFAULT S ETTING
10 (1 second)
C OMMAND M ODE
Global Configuration
C OMMAND U SAGE
◆ When a multicast host leaves a group, it sends an IGMP leave message.
When the leave message is received by the switch, it checks to see if
this host is the last to leave the group by sending out an IGMP group-
specific or group-and-source-specific query message, and starts a
timer. If no reports are received before the timer expires, the group
record is deleted, and a report is sent to the upstream multicast router.
◆ A reduced value will result in reduced time to detect the loss of the last
member of a group or source, but may generate more bursty traffic.
◆ This command will take effect only if IGMP snooping proxy reporting is
enabled ( page 1188 ).
E XAMPLE
Console(config)#ip igmp snooping vlan 1 last-memb-query-intvl 700
Console(config)#
ip igmp snooping
vlan mrd
This command enables sending of multicast router solicitation messages.
Use the no form to disable these messages.
S YNTAX
[no] ip igmp snooping vlan vlan-id mrd
vlan-id - VLAN ID (Range: 1-4093)
D EFAULT S ETTING
Enabled
C OMMAND M ODE
Global Configuration
C OMMAND U SAGE
◆ Multicast Router Discovery (MRD) uses multicast router advertisement,
multicast router solicitation, and multicast router termination messages
to discover multicast routers. 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.