Switching
102
4.4
Multicasts
RM Web
Release
6.0
07/2010
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.
Parameter Meaning Value range Default setting
Unknown Multicasts
X Send to Query Ports:
The device sends the packets
with an unknown MAC/IP
Multicast address to all query
ports.
X Send to All Ports:
The device sends the packets
with an unknown MAC/IP
Multicast address to all ports.
X Discard:
The device discards all packets
with an unknown MAC/IP
Multicast address.
Send to Query
Ports, Send to
All Ports,
Discard
Send to All
Ports
Known Multicasts
X 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.
The advantage of this is that it
works in most applications
without any additional
configuration.
Application:
“Flood and Prune” routing in
PIM-DM.
X Send to registered ports:
The device sends the packets
with a known MAC/IP Multicast
address to registered ports.
The advantage of this setting is
that it uses the available
bandwidth optimally through
direct distribution. It requires
additional port settings.
Application:
Routing protocol PIM-SM.
Send to query
and registered
ports, send to
registered
ports
Send to
registered ports
Table 35: Known and unknown Multicasts
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