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Switching
Parameter
Unknown Multicasts
4.3 Multicasts
Meaning
Value range
Default setting
 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.
Send to Query Send to All
Ports, Send to Ports
All Ports,
Discard
 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 many applications
without any additional
configuration. 
Application: 
“Flood and Prune” routing in
PIM-DM.
Send to query Send to
and registered registered ports
ports, send to
registered
ports
Known Multicasts
 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.
Table 13: Known and unknown Multicasts
S1A78429 - 12/2010
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