Configuring Policy-Based Routing show route-map
8-42 Policy Classification Configuration
Configuring Policy-Based Routing
About Policy-Based Routing
Normally,IPpacketsareforwardedaccordingtotheroutethathasbeenselectedbytraditional
routingprotocols,suchasRIPandOSPF,orbystaticroutes.Inthiscase,selectionisperformed
basedonlyonthedestinationoftheIPpacket.Policy‐basedroutingaddsmoreflexibilityto
routingbyspecifying
otheralternativepaths.Whenaroutemaplistisconfiguredandappliedto
aninterface,policy‐basedroutingwillcheckanincomingIPpacketagainsttheaccesslist(ACL)of
eachmapofthatlistinsequence.IfnoACLpermitrulematchesthepacket,thepacketis
forwardedon
thenormalroutingpathusingaroutelookup.Ifapermitruledoesmatch,theACL
checkisexitedandthemaphavingtheACLmatchingthepacketischeckedforfurtherrouting
instruction.Iftheactionofthatmapispermit,andanexthopisspecified,policy‐basedrouting
willforwardthepackettothenexthopspecifiedinthatmap.Otherwiseitwillforwardthepacket
onthenormalroutingpathusingaroutelookup.Oneroutemaplistisallowedperrouting
interface.
Purpose
Toreviewandconfigureroutemapsandpolicy‐basedrouting.
Commands
show route-map
Usethiscommandtodisplayaconfiguredroutemaplistforpolicy‐basedrouting.
Syntax
show route-map id-number
Router: These commands can be executed when the device is in router mode only. For details on
how to enable router configuration modes, refer to “Enabling Router Configuration Modes” on
page 2-103.
For information about... Refer to page...
show route-map 8-42
route-map 8-43
match ip address 8-44
set next hop 8-45
show ip policy 8-45
ip policy route-map 8-46
ip policy priority 8-47
ip policy load-policy 8-48
ip policy pinger 8-48
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