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Multimedia Traffic Control with IP Multicast (IGMP)
IGMP General Operation and Features
Notes Whenever IGMP is enabled, the switch generates an Event Log message
indicating whether querier functionality is enabled.
IP multicast traffic groups are identified by IP addresses in the range of
224.0.0.0 to 239.255.255.255. The maximum number of multicast groups is 256.
Incoming IGMP packets intended for reserved, or “well-known” multicast
addresses automatically flood through all ports (except the port on which the
packets entered the switch). For more on this topic, see “Excluding Well-
Known or Reserved Multicast Addresses from IP Multicast Filtering” on page
2-27.
For more information, refer to “How IGMP Operates” on page 2-12.
Number of IP Multicast Addresses Allowed
The total of IGMP filters (addresses) and static multicast filters together is
2,047 (if data driven) or 2,048 otherwise, depending on the current max-vlans
configuration. If multiple VLANs are configured, then each filter is counted
once per VLAN in which it is used.
Number of Multicast Filters Allowed
The number of multicast filters allowed depends on the number of configured
VLANS:
■ 16 multicast filters if VLANs <= 1024
■ 8 multicast filters if VLANs > 1024
2-6