Cisco Systems 3750E manual Enter interface configuration mode, 42-46

Chapter 42 Configuring IP Multicast Routing

Configuring Advanced DVMRP Interoperability Features

Figure 42-8 Router Rejects Nonpruning DVMRP Neighbor

Source router or RP

	RP
	Router A
Multicast	Router B
traffic gets
to receiver,			Receiver
not to leaf
DVMRP
device
		Layer 3 switch

Configure the ip dvmrp reject-non-prunerscommand

on this interface.

Leaf nonpruning DVMRP device

101245

Note that the ip dvmrp reject-non-prunersinterface 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	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.

To disable this function, use the no ip dvmrp reject-non-prunersinterface configuration command.

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
42-46	OL-9775-02