Configuring Igmp Filtering - AMX NXA-ENET8-2POE Operation/Reference Manual

Configuring the NXA-ENET8-2POE
IGMP Snooping VLAN Configuration parameters (Cont.)
• RV
• QI
• QRI
• LLQI
• URI
1.
Click Configuration, IPMC, IGMP Snooping, VLAN Configuration.
2.
Adjust the IGMP settings as required.
3.
Click Save.

Configuring IGMP Filtering

Use the IGMP Snooping Port Group Filtering Configuration page to filter specific multicast traffic. 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 denying access to specified multicast services on a switch port.
FIG. 78 IGMP Snooping Port Group Filtering Configuration
104
The Robustness Variable allows tuning for the expected packet loss on a network.
A port will be removed from receiving a multicast service when no IGMP reports
are detected in response to a number of IGMP queries. The robustness variable
sets the number of queries on ports for which there is no report. (Range: 1-255;
Default: 2)
Routers adopt the robustness value from the most recently received query. If the
querier's robustness variable (QRV) is zero, indicating that the QRV field does not
contain a declared robustness value, the switch will set the robustness variable to
the value statically configured by this command. If the QRV exceeds 7, the maxi-
mum value of the QRV field, the robustness value is set to zero, meaning that this
device will not advertise a QRV in any query messages it subsequently sends.
The Query Interval is the interval at which MLD General Queries are sent by the
Querier. (Range: 1-255 seconds; Default: 125 seconds) An MLD general query
message is sent by the switch at the interval specified by this attribute. When this
message is received by downstream hosts, all receivers build an MLD report for
the multicast groups they have joined.
The Query Response Interval is the Max Response Time advertised in periodic
General Queries. The QRI applies when the switch is serving as the querier, and
is used to inform other devices of the maximum time this system waits for a
response to general queries. (Range: 10-31744 tenths of a second; Default: 10
seconds)
The Last Member Query Interval (RFC 3810. MLDv2 for IP) is used to configure
the Last Member Query Interval for IGMP. This attribute sets the interval to wait
for a response to a group-specific or group-and-source-specific query message.
The overall time to wait for a response (Last Member Query Time) is the value
assigned to LLQI, multiplied by the Last Member Query Count (which is fixed at
2). (Range: 1-31744 tenths of a second in multiples of 10; Default: 1 second)
When a multicast host leaves a group, it sends an IGMP leave message. When
the leave message is received by the switch, it checks to see if this host is the last
to leave the group by sending out an IGMP group-specific or group-and-source-
specific query message, and starts a timer.
If no reports are received before the timer expires, the group record is deleted,
and a report is sent to the upstream multicast router.
A reduced value will result in reduced time to detect the loss of the last member of
a group or source, but may generate more burst traffic.
This attribute will take effect only if IGMP snooping proxy reporting is enabled.
The Unsolicited Report Interval specifies how often the upstream interface should
transmit unsolicited IGMP reports when report suppression/proxy reporting is
enabled. (Range: 0-31744 seconds, Default: 1 second)
NXA-ENET8-2POE Gigabit Ethernet Layer 2 PoE Switch