Interlogix NS3550-2T-8S User Manual - Manual (Page 176)

IFS NS3552-8P-2S AND NS3550-2T-8S User Manual
176
• IGMP Querier
Enable the IGMP Querier in the VLAN.
• Compatibility
Compatibility is maintained by hosts and routers taking appropriate actions
depending on the versions of IGMP operating on hosts and routers within a
network. The allowed selection is IGMP-Auto, Forced IGMPv1, Forced IGMPv2,
Forced IGMPv3, default compatibility value is IGMP-Auto.
• RV Robustness Variable. The Robustness Variable allows tuning for the expected
packet loss on a network.
The allowed range is 1 to 255, default robustness variable value is 2.
• QI Query Interval. The Query Interval is the interval between General Queries sent
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 is 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.