Handbook

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EXCLUDE mode: The host requests membership to a multicast group and provides a list of IP
addresses from which it does not want to receive traffic. This indicates that the host wants to receive
traffic only from sources that are not part of the Exclude list.
To disable snooping on EXCLUDE mode reports, use the following command:
/cfg/l3/igmp/snoop/igmpv3/exclude dis
By default, the switch snoops the first eight sources listed in the IGMPv3 Group Record. Use the following
command to change the number of snooping sources:
/cfg/l3/igmp/snoop/igmpv3/sources <1-64>
IGMPv3 Snooping is compatible with IGMPv1 and IGMPv2 Snooping. You can disable snooping on version
1 and version 2 reports, using the following command:
/cfg/l3/igmp/snoop/igmpv3/v1v2 dis
Fast Leave
When the switch with IGMP Snooping enabled receives an IGMPv2 leave message, it sends a Group-
Specific Query to determine if any other devices in the same group (and on the same port) are still
interested in the specified multicast group traffic. The switch removes the affiliated port from that
particular group, if the following conditions apply:
If the switch does not receive an IGMP Membership Report message within the query-response-
interval
If no multicast routers have been learned on that port.
With Fastleave enabled on the VLAN, a port can be removed immediately from the port list of the group
entry when the IGMP Leave message is received, unless a multicast router was learned on the port.
Enable FastLeave only on VLANs that have only one host connected to each physical port.
IGMP Filtering
With IGMP Filtering, you can allow or deny a port to send and receive multicast traffic to certain multicast
groups. Unauthorized users are restricted from streaming multicast traffic across the network.
If access to a multicast group is denied, IGMP Membership Reports from the port for that group are
dropped, and the port is not allowed to receive IP multicast traffic from that group. If access to the
multicast group is allowed, Membership Reports from the port are forwarded for normal processing.
To configure IGMP Filtering, you must globally enable IGMP Filtering, define an IGMP Filter, assign the filter
to a port, and enable IGMP Filtering on the port. To define an IGMP Filter, you must configure a range of
IP multicast groups, choose whether the filter will allow or deny multicast traffic for groups within the
range, and enable the filter.
NOTE: Low-numbered filters take precedence over high-number filters. For example, the action
defined for IGMP Filter 1 supersedes the action defined for IGMP Filter 2.
Configuring the range
Each IGMP Filter allows you to set a start and end point that defines the range of IP addresses upon which
the filter takes action. Each IP address in the range must be between 224.0.0.0 and 239.255.255.255.
Configuring the action
Each IGMP Filter can allow or deny IP multicasts to the range of IP addresses configured. If you configure
the filter to deny IP multicasts, then IGMP Membership Reports from multicast groups within the range are
dropped.
You can configure a secondary filter to allow IP multicasts to a small range of addresses within a larger
range that a primary filter is configured to deny. The two filters work together to allow IP multicasts to a
small subset of addresses within the larger range of addresses. The secondary filter must have a lower
number than the primary filter, so that it takes precedence.
Static multicast router
A static multicast router (Mrouter) can be configured for a particular port on a particular VLAN. A static
Mrouter does not have to be learned through IGMP Snooping.
A total of eight static Mrouters can be configured on the switch. A port that belongs to a trunk group
cannot accept a static Mrouter, only Mrouters learned through IGMP Snooping.