HP 6120XG HP ProCurve Series 6120 Blade Switches Multicast and Routing Guide - Page 46

Reserved Addresses Excluded from IP Multicast IGMP Filtering

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Multimedia Traffic Control with IP Multicast (IGMP) Excluding Well-Known or Reserved Multicast Addresses from IP Multicast Filtering Notes: IP multicast addresses occur in the range from 224.0.0.0 through 239.255.255.255 (which corresponds to the Ethernet multicast address range of 01005e-000000 through 01005e-7fffff). Where a switch has a static Traffic/ Security filter configured with a "Multicast" filter type and a "Multicast Address" in this range, the switch will use the static filter unless IGMP learns of a multicast group destination in this range. In this case, IGMP dynamically takes over the filtering function for the multicast destination address(es) for as long as the IGMP group is active. If the IGMP group subsequently deacti­ vates, the switch returns filtering control to the static filter. Reserved Addresses Excluded from IP Multicast (IGMP) Filtering. Traffic to IP multicast groups in the IP address range of 224.0.0.0 to 224.0.0.255 will always be flooded because addresses in this range are "well known" or "reserved" addresses. Thus, if IP Multicast is enabled and there is an IP multicast group within the reserved address range, traffic to that group will be flooded instead of filtered by the switch. 2-20

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Multimedia Traffic Control with IP Multicast (IGMP)
Excluding Well-Known or Reserved Multicast Addresses from IP Multicast Filtering
Notes:
IP multicast addresses occur in the range from 224.0.0.0 through
239.255.255.255 (which corresponds to the Ethernet multicast address range
of 01005e-000000 through 01005e-7fffff). Where a switch has a static Traffic/
Security filter configured with a “Multicast” filter type and a “Multicast
Address” in this range, the switch will use the static filter unless IGMP learns
of a multicast group destination in this range. In this case, IGMP dynamically
takes over the filtering function for the multicast destination address(es) for
as long as the IGMP group is active. If the IGMP group subsequently deacti-
vates, the switch returns filtering control to the static filter.
Reserved Addresses Excluded from IP Multicast (IGMP) Filtering.
Traffic to IP multicast groups in the IP address range of 224.0.0.0 to 224.0.0.255
will always be flooded because addresses in this range are “well known” or
“reserved” addresses. Thus, if IP Multicast is enabled and there is an IP
multicast group within the reserved address range, traffic to that group will
be flooded instead of filtered by the switch.
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