User manual

FL SWITCH MM HS
6-8
PHOENIX CONTACT 6874_en_09
6.4.1.1 Extended Multicast Filtering
If IGMP snooping is active, multicast data streams are also detected for which no
membership reports of possible recipients are registered. For these multicasts, groups are
created dynamically. These multicasts are forwarded to the querier, i.e., the querier port is
entered in the group.
If the switch itself is the querier, these multicasts are blocked.
6.4.2 "General Multicast Configuration" Web Page
This web page provides global settings for multicast support. Here, IGMP snooping can be
activated and an aging time can be specified for IGMP snooping information.
Figure 6-4 "General Multicast Configuration" web page
IGMP Snooping
In IGMP snooping, the switch passively listens in on the IGMP messages that are sent over
the network and dynamically creates the appropriate groups. The groups are not saved
and will be lost on every power down or when switching off the snooping function.
IGMP Query
An MMS with activated query function actively sends queries at "query intervals" and
evaluates the received reports. The MMS only sends IGMP query reports if IGMP snooping
is enabled and only in the management VLAN.