Planet Networking & Communication WGSD-10020, Руководство пользователя, Страница: 160 / 557

User’s Manual of WGSD-10020 Series
by the Querier. The allowed range is 1 to 255 seconds, default query interval is
125 seconds.

QRI
Query Response Interval. The Max Response Time used to calculate the Max
Resp Code inserted into the periodic General Queries. The allowed range is 0 to
31744 in tenths of seconds, default query response interval is 100 in tenths of
seconds (10 seconds).

LLQI (LMQI for IGMP)
Last Member Query Interval. The Last Member Query Time is the time value
represented by the Last Member Query Interval, multiplied by the Last Member
Query Count. The allowed range is 0 to 31744 in tenths of seconds, default last
member query interval is 10 in tenths of seconds (1 second).

URI
Unsolicited Report Interval. The Unsolicited Report Interval is the time between
repetitions of a host's initial report of membership in a group. The allowed range
is 0 to 31744 seconds, default unsolicited report interval is 1 second.
Buttons
: Refreshes the displayed table starting from the "VLAN" input fields.
: Updates the table starting from the first entry in the VLAN Table, i.e. the entry with the lowest VLAN ID.
: Updates the table, starting with the entry after the last entry currently displayed.
: Click to save changes.
: Click to undo any changes made locally and revert to previously saved values.
4.8.4 IGMP Snooping Port Group Filtering
In certain switch applications, the administrator may want to control the multicast services that are available to end users. For
example, an IP/TV service based on a specific subscription plan. The IGMP filtering feature fulfills this requirement by restricting
access to specified multicast services on a switch port, and IGMP throttling limits the number of simultaneous multicast groups a
port can join.
IGMP filtering enables you to assign a profile to a switch port that specifies multicast groups that are permitted or denied on the
port. An IGMP filter profile can contain one or more, or a range of multicast addresses; but only one profile can be assigned to a
port. When enabled, IGMP join reports received on the port are checked against the filter profile. If a requested multicast group
is permitted, the IGMP join report is forwarded as normal. If a requested multicast group is denied, the IGMP join report is
dropped.
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, the switch can take one of two actions; either “deny” or “replace”. If the action is set to deny, any
new IGMP join reports will be dropped. If the action is set to replace, the switch randomly removes an existing group and
replaces it with the new multicast group. The IGMP Snooping Port Group Filtering Configuration screen in Figure 4-8-7 appears.
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