Multicast filtering
6874_en_16
PHOENIX CONTACT
7-9
IGMP query / IGMP query interval
A switch with activated query function actively sends queries of the version selected under
"IGMP Query" at the "IGMP Query Interval" and evaluates the received reports. The switch
only sends IGMP query reports if IGMP snooping is enabled and only in the management
VLAN.
Extended multicast source detection
(see 7.5 "Multicast source detection" on page 7-9)
Forward unknown multicasts to querier
Selection as to whether a group which forwards packets to the querier is created for
unknown multicast packets.
Block unknown multicasts at querier
Selection as to whether unknown multicast packets are to be blocked on the querier.
Query port configuration
Auto query port (FRD, MRP)
Activates the automatic selection of additional query ports by fast-ring detection and/or
MRP. Redundant ports are thereby automatically integrated in every multicast group. In the
event of redundancy switching, the multicast packets are not blocked because the ports
required are already members of the groups.
Static query ports
Selection of which ports are static query ports.
Clear auto detected query ports
Deletes the ports automatically assigned to the groups.
7.5
Multicast source detection
Multicast source detection can be used to create dynamic multicast groups without the
multicast receiver/membership report sender in the network being active.
7.5.1
Properties of multicast source detection
The following properties apply if IGMP snooping has previously been activated globally.
a) The switch is not the IGMP querier in the network segment because the querier
function is deactivated or another device has assumed the querier role.
–
If the switch receives an IGMP query packet, it will save the port via which it received
the packet for the IGMP query time and add it to each dynamic multicast group.
If this function is activated, the multicast tables are not deleted during redundancy
switching. Deletion of the multicast tables is triggered when the auto query ports are
deactivated in order to enforce a new multicast group learning process in the event of
redundancy switching.
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