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Catalyst 3750 Switch Software Configuration Guide
OL-8550-02
Chapter 40 Configuring IP Multicast Routing
Configuring Advanced DVMRP Interoperability Features
Figure 40-7 Router Rejects Nonpruning DVMRP Neighbor
Note that the ip dvmrp reject-non-pruners interface configuration command prevents peering with
neighbors only. If there are any nonpruning routers multiple hops away (downstream toward potential
receivers) that are not rejected, a nonpruning DVMRP network might still exist.
Beginning in privileged EXEC mode, follow these steps to prevent peering with nonpruning DVMRP
neighbors. This procedure is optional.
To disable this function, use the no ip dvmrp reject-non-pruners interface configuration command.
101245
Router A
Router B
RP
Multicast
traffic gets
to receiver,
not to leaf
DVMRP
device
Source router or RP
Leaf nonpruning DVMRP device
Configure the ip dvmrp
reject-non-pruners command
on this interface.
Receiver
Layer 3 switch
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Specify the interface connected to the nonpruning DVMRP neighbor,
and enter interface configuration mode.
Step 3
ip dvmrp reject-non-pruners Prevent peering with nonpruning DVMRP neighbors.
Step 4
end Return to privileged EXEC mode.
Step 5
show running-config Verify your entries.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
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