Cisco WS-C3550-12G Software Configuration Manual page 658

Configuring Advanced DVMRP Interoperability Features
Figure 24-14 Router Rejects Nonpruning DVMRP Neighbor
Multicast
traffic gets
to receiver,
not to leaf
DVMRP
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:
Command
Step 1
configure terminal
Step 2 interface interface-id
Step 3
ip dvmrp reject-non-pruners
Step 4
end
Step 5
show running-config
Step 6 copy running-config startup-config
To disable this function, use the no ip dvmrp reject-non-pruners interface configuration command.
Catalyst 3550 Multilayer Switch Software Configuration Guide
24-52
Source router or RP
RP
Router A
Router B
device
Multilayer switch
Si
Configure the ip dvmrp
reject-non-pruners command
on this interface.
Leaf nonpruning DVMRP device
Receiver
Purpose
Enter global configuration mode.
Enter interface configuration mode, and specify the interface connected
to the nonpruning DVMRP neighbor.
Prevent peering with nonpruning DVMRP neighbors.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Chapter 24 Configuring IP Multicast Routing
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