Administrator Guide

Layer 3 Routing Commands 1574
console(config-route-map)# match ip address prefix-list redist-pl
console(config-route-map)# exit
console(config) router bgp 1
console(Config-router) redistribute ospf route-map redist-rm
set interface null0
Use this command to drop a packet instead of reverting to normal routing for
packets that do not match the route map criteria. This command should be
configured as the last entry in the route-map as no further set clauses will
operate on a dropped packet. Use the no form of this command to remove the
set clause from a route map.
Syntax
set interface null0
no set interface null0
• null0 — Specifies the null0 interface used to drop packets.
Default Configuration
There is no default configuration for this command.
Command Mode
Route Map mode
User Guidelines
A route-map statement used for policy based routing is configured as permit
or deny. If the statement is marked as deny, traditional destination-based
routing is performed on the packet meeting the match criteria. If the
statement is marked as permit and the packet meets all the match criteria,
the set clauses in the route-map statement are applied. If no match is found
in the route-map, the packet is forwarded using the routing decision resulting
from traditional destination-based routing. If the network administrator does
not want to revert to normal forwarding but instead want to drop packets that
do not match the specified criteria, a set clause routing the packets to
interface null0 may be configured as the last (highest numbered) route-map.
2CSNXXX_SWUM204.book Page 1574 Monday, January 25, 2016 1:25 PM