LevelOne GEP-1070, User Manual

Page: 141 / 319

141
natively to the upstream multicast routers.
Port Related Configuration
◆
Port
– Port identifier.
◆
Router Port
– Sets a port to function as a router port, which leads towards a Layer 3
multicast device or IGMP querier. (Default: Disabled) If IGMP snooping cannot locate the
IGMP querier, you can manually designate a port which is connected to a known IGMP
querier (i.e., a multicast router/switch). This interface will then join all the current multicast
groups supported by the attached router/switch to ensure that multicast traffic is passed to
all appropriate interfaces within the switch.
◆
Fast Leave
– Immediately deletes a member port of a multicast service if a leave packet
is received at that port. (Default: Disabled)
The switch can be configured to immediately delete a member port of a multicast service if
a leave packet is received at that port and the Fast Leave function is enabled. This allows
the switch to remove a port from the multicast forwarding table without first having to send
an IGMP group-specific (GS) query to that interface.
If Fast Leave is not used, a multicast router (or querier) will send a GS-query message when
an IGMPv2/v3 group leave message is received. The router/querier stops forwarding traffic
for that group only if no host replies to the query within the specified timeout period.
If Fast Leave is enabled, the switch assumes that only one host is connected to the interface.
Therefore, Fast Leave should only be enabled on an interface if it is connected to only one
IGMP-enabled device, either a service host or a neighbor running IGMP snooping.
Fast Leave is only effective if IGMP snooping is enabled, and IGMPv2 or IGMPv3 snooping
is used.
Fast Leave does not apply to a port if the switch has learned that a multicast router is
attached to it.
Fast Leave can improve bandwidth usage for a network which frequently experiences many
IGMP host add and leave requests.
◆
Throttling
– Limits the number of multicast groups to which a port can belong. (Range: 1-
10; Default: unlimited)
IGMP throttling sets a maximum number of multicast groups that a port can join at the same
time. When the maximum number of groups is reached on a port, any new IGMP join reports
will be dropped.
WEB INTERFACE