User's Manual

724-746-5500 | blackbox.com
724-746-5500 | blackbox.com
Page 77
LGB5028A User‘s Manual
Chapter 6: Configuration
IGMP Querier: A router sends IGMP query messages onto a particular link. This router is called the 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: Show 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
31744 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):
Show the 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: Show the 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:
Save: Click to save changes.
Reset: Click to undo any changes made locally and revert to previously saved values.
Upper right icon (Refresh, |<<, >>): Click to refresh the displayed table starting from the “VLAN” input fields. Or click “|<<” to
update the table starting from the first entry in the VLAN table, that is, the entry with the lowest VLAN ID. Click “>> “ to update
the table, starting with the entry after the last entry currently displayed.
6.5.3 Port Group Filtering
The section describes how to set the IGMP port group filtering. In some applications, such as metropolitan or multiple-dwelling
unit (MDU) installations, a user might want to control the multicast groups that a user on a switch port can belong to. The IGMP
filtering feature enables the user to control the distribution of multicast services, such as IP/TV, based on a subscription or service
plan.
With this feature, you can filter multicast joins on a per-port basis by configuring IP multicast profiles and associating them with
individual switch ports. An IGMP profile can contain one or more multicast groups and specifies whether access to the group is
permitted or denied. If an IGMP profile denying access to a multicast group is applied to a switch port, the IGMP join report
requesting the stream of IP multicast traffic is dropped, and the port is not allowed to receive IP multicast traffic from that group.
If the filtering action permits access to the multicast group, the IGMP report from the port is forwarded for normal processing.
IGMP filtering controls only IGMP membership join reports and has no relationship to the function that directs the forwarding of
IP multicast traffic.
Web Interface
To configure the IGMP Snooping Port Group Configuration in the Web interface:
1. Click “Configuration,” “IGMP Snooping,” “Port Group Filtering.”
2. Click “Add new Filtering Group.”
3. Scroll the Port to enable the Port Group Filtering. Specify the Filtering Groups in the blank field.