Rejecting A Dvmrp Nonpruning Neighbor - Cisco Catalyst 3120 Software Manual

Catalyst blade switch for hp

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Configuring IP Multicast Routing

Configuring Advanced DVMRP Interoperability Features

Rejecting a DVMRP Nonpruning Neighbor

By default, Cisco devices accept all DVMRP neighbors as peers, regardless of their DVMRP capability.

However, some non-Cisco devices run old versions of DVMRP that cannot prune, so they continuously

receive forwarded packets, wasting bandwidth.

shows this scenario.

Leaf Nonpruning DVMRP Neighbor

Source router or RP

PIM dense mode

Layer 3 switch

Leaf nonpruning

DVMRP device

Stub LAN with no members

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

44-8. In this case, when the

switch receives DVMRP probe or report message without the prune-capable flag set, the switch logs a

syslog message and discards the message.

Cisco Catalyst Blade Switch 3120 for HP Software Configuration Guide

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