Cisco Catalyst 3120 Software Manual page 1042

Configuring Advanced DVMRP Interoperability Features
Figure 44-8
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. This procedure is optional.
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.
Cisco Catalyst Blade Switch 3120 for HP Software Configuration Guide
44-48
Router Rejects Nonpruning DVMRP Neighbor
Source router or RP
RP
Router A
Router B
device
Layer 3 switch
Configure the ip dvmrp
reject-non-pruners command
on this interface.
Leaf nonpruning DVMRP device
Receiver
Purpose
Enter global configuration mode.
Specify the interface connected to the nonpruning DVMRP neighbor,
and enter interface configuration mode.
Prevent peering with nonpruning DVMRP neighbors.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Chapter 44 Configuring IP Multicast Routing
OL-12247-01