Multimedia Traffic Control with IP Multicast (IGMP)

Excluding Multicast Addresses from IP Multicast Filtering

N o t e s :

IP Multicast Filters. This operation applies to the ProCurve Switch

 

1600M, 2400M, 2424M, 4000M, and 8000M, but not to the Switch 2500,

 

2600, 2600-PWR, 2800, 2810, 2510/2510G, 4100, and 5300 Series devices

 

or the Switch 6108 (which do not have static multicast traffic/security

 

filters).

 

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

 

deactivates, 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.

Number of IP Multicast Addresses Allowed. Multicast filters and IGMP filters (addresses) together can total up to 255 in the switch. If multiple VLANs are configured, then each filter is counted once per VLAN in which it is used.

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