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Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-21521-01
Chapter 48 Configuring IP Multicast Routing
Configuring Advanced DVMRP Interoperability Features
Figure 48-8 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 48-9. In this case, when the
switch receives DVMRP probe or report message without the prune-c
apable 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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