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Enterasys Networks XSR CLI Router User Manual

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OSPF Commands

5-102 Configuring the Internet Protocol

Next Mode

Routerconfiguration:XSR(config-router)#

Default

OSPFdisabled

Example

ThefollowingexampleenablesOSPFrouting:

XSR(config)#router ospf 2

XSR(config-router)#

summary address

Thiscommandsummarizeslocally‐sourced(Type‐5)routesontheXSRwhichareredistributed

fromotherprotocolsintoOSPF.Type‐7translationsarenotsummarized.Otheractions

implementedinclude:

•Asummaryrangebecomesactiveifitincludesatleastonelocallysourcedroutebeing

redistributedintoOSPF.Ifanactivesummary

rangeisadvertised,thenadiscardroutewillbe

installedforthesumm aryrange.Conversely,whenitbecomesinactive,thediscardrouteis

removed.

•ActivatedsummaryrangestobeadvertisedwillresultinaType‐5Linke‐StateAnnouncement

(LSA).IftheyincludeaNSSAarea,thentheywillalsoproduce

aType‐7LSAforeachNSSA

area.

•Thetype/costofthesummaryrangeisthehighesttype/costamongallincludedlocally‐

sourcedroutes.Theforwardingaddressis0.

• Summaryrangesmayoverlap.So,foralocally‐sourcedroute,themostspecificrangebecomes

active.

•AppendixEprocessingprovidesauniquelink‐

stateIDforallType‐5LSAsadvertised,bethey

theresultofType‐7toType‐5translations,summarizationorlocally‐sourcedrouteswhichare

notsummarized.

•AType‐5LSAgeneratedbytranslationmaysupplantaType‐5LSAoriginatingfromalocal

source.Thiswillnotaffectwhat

isbeinggeneratedintoaNSSAbecausetranslationsarenot

advertisedintoNSSAareas.

•Ifforagivenprefix,bothasummaryandalocally‐sourcedrouteexist,thesummarywillbe

consideredsuperiorevenifthesummaryincludesonlythislocally‐sourcedroute.

• NeedlessreoriginationofType‐5LSAswillbe

avoided.Forexample.importinglocally‐

sourcedrouteswhichdonotchangethetype/costofasummarywillnotresultin

reoriginationofthesummaryLSA.

•Type‐7translationsarenotaffectedbythiscommand.Ifanoverflowconditionoccursthen

bothsummaryrangesandnon‐summarizedrouteswillbeflushedfrom

theAS.

Syntax

summary-address <ip-address><ip-mask>[not-advertise][tag <tag>]

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