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Catalyst 3750 Switch Software Configuration Guide
78-16180-02
Chapter 36 Configuring IP Multicast Routing
Configuring Advanced DVMRP Interoperability Features
Figure 36-6 Leaf Nonpruning DVMRP Neighbor
You can prevent the switch from peering (communicating) with a DVMRP neighbor if that neighbor does
not support DVMRP pruning or grafting. To do so, configure the switch (which is a neighbor to the leaf,
nonpruning DVMRP machine) with the ip dvmrp reject-non-pruners interface configuration command
on the interface connected to the nonpruning machine as shown in Figure 36-7. In this case, when the
switch receives DVMRP probe or report message without the prune-capable flag set, the switch logs a
syslog message and discards the message.
101244
Router A
Router B
Layer 3 switch
RP
Valid
multicast
traffic
Unnecessary
multicast
traffic
Source router or RP
PIM dense mode
Leaf nonpruning
DVMRP device
Receiver
Stub LAN with no members
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