Hirschmann RS20 User Manual page 102

Network load control
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
address.
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
routing protocols.
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 ad-
dress to all query ports and to registered ports.
This standard setting sends all Multicasts to all query ports and to
registered ports. The advantage of this is that it works in most appli-
cations without any additional configuration.
Application: "Flood and Prune" routing in PIM-DM.
"Send to registered ports".
The device sends the packets with a known MAC/IP Multicast ad-
dress to registered ports.
The advantage of this setting, which deviates from the standard, is
that it uses the available bandwidth optimally through direct distribu-
tion. It requires additional port settings.
Application: Routing protocol PIM-SM.
102
7.2 Multicast application
Basic Configuration L2P
Release 4.2 07/08