HP 6120XG HP ProCurve Series 6120 Blade Switches Multicast and Routing Guide - Page 45
Excluding Well-Known or Reserved Multicast Addresses from IP Multicast Filtering
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Multimedia Traffic Control with IP Multicast (IGMP) Excluding Well-Known or Reserved Multicast Addresses from IP Multicast Filtering Excluding Well-Known or Reserved Multicast Addresses from IP Multicast Filtering Each multicast host group is identified by a single IP address in the range of 224.0.0.0 through 239.255.255.255. Specific groups of consecutive addresses in this range are termed "well-known" addresses and are reserved for pre defined host groups. IGMP does not filter these addresses, so any packets the switch receives for such addresses are flooded out all ports assigned to the VLAN on which they were received (except the port on which the packets entered the VLAN). The following table lists the 32 well-known address groups (8192 total addresses) that IGMP does not filter on. Table 2-2.IP Multicast Address Groups Excluded from IGMP Filtering Groups of Consecutive Addresses in the Range of 224.0.0.X to 239.0.0.X* 224.0.0.x 232.0.0.x 225.0.0.x 233.0.0.x 226.0.0.x 234.0.0.x 227.0.0.x 235.0.0.x 228.0.0.x 236.0.0.x 229.0.0.x 237.0.0.x 230.0.0.x 238.0.0.x 231.0.0.x 239.0.0.x * X is any value from 0 to 255. Groups of Consecutive Addresses in the Range of 224.128.0.X to 239.128.0.X* 224.128.0.x 232.128.0.x 225.128.0.x 233.128.0.x 226.128.0.x 234.128.0.x 227.128.0.x 235.128.0.x 228.128.0.x 236.128.0.x 229.128.0.x 237.128.0.x 230.128.0.x 238.128.0.x 231.128.0.x 239.128.0.x 2-19