Layer 3 Routing Commands 1487
Route maps are ordered from lowest to greatest sequence number, with lower
sequence numbers being considered first. If no sequence number is specified,
the system assigns a value ten greater than the last statement in the route
map. The range is 0 to 65,535.
One use of a route map is to limit the redistribution of routes to a specified
range of route prefixes. The redistribution command specifies a route map
which refers to a prefix list. The prefix list identifies the prefixes that may be
redistributed.
Examples
The following example creates (or edits) the route map equal-access as the
first route map in the system for allowing matching packets into the system.
Route-map mode is also entered.
console(config)#route-map equal-access permit 0
In the following example, BGP is configured to redistribute all prefixes within
172.20.0.0 and reject all others.
console(config)# ip prefix-list redist-pl permit 172.20.0.0/16 le 32
console(config)# route-map redist-rm permit
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.
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