Immediate-Leave Processing; Igmp Snooping Commands - Nokia ESB26 User Manual

20.
traffic to the VLAN. The switch forwards multicast group traffic only to those hosts listed in
the forwarding table for that multicast group.
When hosts want to leave a multicast group, they can leave silently or send a leave message.
When the switch receives a leave message from a host, it sends out a MAC-based general
query to determine if any other devices connected to that interface are interested in traffic for
the specific multicast group. The switch then updates the forwarding table for that MAC
group so that only those hosts interested in receiving multicast traffic for the group are listed
in the forwarding table. If the router receives no reports from a VLAN, it removes the group
for the VLAN from its IGMP cache.

Immediate-Leave Processing

IGMP snooping Immediate-Leave processing allows the switch to remove an interface that
sends a leave message from the forwarding table, without first sending out MAC-based
general queries to the interface. The VLAN interface is pruned from the multicast tree for the
multicast group specified in the original leave message. Immediate-Leave processing ensures
optimal bandwidth management for all hosts on a switched network, even when multiple
multicast groups are in use simultaneously.

IGMP Snooping Commands

The following IGMP Snooping commands are available.
Table 20-1 IGMP Snooping Commands
C o m m a n d
ip igmp snooping
ip igmp snooping vlan
ip igmp snooping vlan mrouter
ip igmp snooping vlan static
ip igmp snooping vlan immediate-
leave
ip igmp snooping for-all
ip igmp snooping forbidden
ip igmp snooping send-query
show ip igmp snooping
show ip igmp snooping mrouter
MN700004 Rev 01
IGMP Snooping
D e s c r i p t i o n
Enables IGMP snooping in all existing VLAN interfaces.
Enables the VLAN id for the multicast group.
Adds a multicast router port (adds a static connection to
a multicast router).
Configures a Host or physical interface statically to join a
multicast group.
Enables IGMP Immediate-Leave Processing on the VLAN
interface.
Forwards all multicast via the port list.
Forbids IGMP snooping via the port list.
Queries sending.
Displays snooping configuration information for the
switch or for a specified VLAN.
Displays information
manually configured multicast router interfaces.
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on dynamically learned and