Unknown Multicasts; Known Multicasts - Hirschmann RS20 Reference Manual

Switching

5.3.2 Unknown Multicasts

In this frame you can determine how the device in IGMP mode sends packets
with an unknown MAC/IP Multicast address that was not learned through
IGMP Snooping.
"Send to Query Ports".
The device sends the packets with an unknown MAC/IP Multicast address
to all query ports.
"Send to All Ports".
The device sends the packets with an unknown MAC/IP Multicast address
to all ports.
"Discard".
The device discards all packets with an unknown MAC/IP Multicast ad-
dress.
Note: The way in which unlearned Multicast addresses are handled
also applies to the reserved addresses from the "Local Network Control
Block" (224.0.0.0 - 224.0.0.255). This can have an effect on higher-level rout-
ing protocols.

5.3.3 Known Multicasts

In this frame you can determine how the device in IGMP mode sends packets
with known MAC/IP Multicast addresses that were learned through IGMP
Snooping.
"Send to query and registered ports".
The device sends the packets with a known MAC/IP Multicast address to
all query ports and to registered ports.
This standard setting sends all Multicasts to all query ports and to regis-
tered ports. The advantage of this is that it works in most applications
without any additional configuration.
Application: "Flood and Prune" routing in PIM-DM.
RM Web L2B
Release 4.2 07/08
5.3 Multicasts
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