По крайней мере когда я там из спортивного интереса пустил телевидение оно работало очень странно (на длинк)
Сам IEEE IGMP не стандартизировал, ввиду наличия GMRP (GARP) протокола, который в дальнейшем заменили на MRP, я имею ввиду в более поздних стандартах, я взял 802.1D, поскольку он является базовым для всех Ethernet коммутаторов или любых других, реализующих концепцию MAC Bridges на канальном уровне.
IEEE Std 802.1D™- 2004 (Revision of IEEE Std 802.1D-1998)
7.9.4 Default Group filtering behavior
Forwarding and filtering of group addressed frames on each outbound Port by a Bridge that supports Extended Filtering Services, can be managed by creating a Static Filtering Entry that specifies a default for All Group Addresses and or a Static Filtering Entry that specifies a default for All Unregistered Group Addresses (7.9.1). The behavior of each of these defaults, as modified by more explicit Filtering Database entries applicable to a given frame’s MAC Address, reception Port, and outbound Port, is as follows:
NOTE 1—As stated in 7.9.1, a Bridge may support creation of separate Static Filtering Entries with a distinct Port Map for each reception Port. If this capability is not provided, then a given Static Filtering Entry applies to all reception Ports.
a) Forward All Groups. The frame is forwarded, unless an explicit Static Filtering Entry specifies filtering independent of any dynamic filtering information.
b) Forward Unregistered Groups. The frame is forwarded, unless
1) An explicit Static Filtering Entry specifies filtering independent of any dynamic filtering information; or
2) An explicit Static Filtering Entry specifies forwarding or filtering on the basis of dynamic filtering information, and an applicable explicit Group Registration Entry exists specifying filtering; or
3) An applicable explicit Static Filtering Entry does not exist, but an applicable Group Registration entry specifies filtering.
c) Filter Unregistered Groups. The frame is filtered unless
1) An explicit Static Filtering Entry specifies forwarding independent of any dynamic filtering information; or
2) An explicit Static Filtering Entry specifies forwarding or filtering on the basis of dynamic filtering information, and an applicable explicit Group Registration Entry exists specifying forwarding; or
3) An applicable explicit Static Filtering Entry does not exist, but an applicable Group Registration entry specifies forwarding.
In Bridges that support only Basic Filtering Services, the default Group filtering behavior is Forward All Groups for all Ports of the Bridge.
NOTE 2—Forward All Groups corresponds directly to the behavior specified in IEEE Std 802.1D, 1993 Edition when forwarding group MAC Addressed frames for which no static filtering information exists in the Filtering Database. Forward All Groups makes use of information contained in Static Filtering Entries for specific group MAC Addresses, but overrides any information contained in Group Registration Entries. Forward Unregistered Groups is analogous to the forwarding behavior of a Bridge with respect to individual MAC Addresses; if there is no static or dynamic information for a specific group MAC Address, then the frame is forwarded; otherwise, the frame is forwarded in accordance with the statically configured or dynamically learned information.