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Enterasys Networks XSR CLI Router User Manual

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OSPF Commands

5-86 Configuring the Internet Protocol

Default

NoNSSAdefined

Example

Thefollowingexampleconfiguresarea10asaNSSAarea:

XSR(config)#interface fastethernet 1

XSR(config-if<F1>)#ip address 172.16.10.5 255.255.255.252

XSR(config)#router ospf 1

XSR(config-router)#network 172.16.10.5 0.0.0.0 area 10

XSR(config-router)#area 10 nssa default-information-originate

area range

ThiscommanddefinestherangeofaddressestobeusedbyAreaBoundaryRouters(ABRs)when

theycommunicateroutestootherareas.ABRssummarizeanarea’sintra‐arearoutesintointer‐

arearouteswhicharetheninjectedintootherareas.Themetricusedisthehighestmetricofthe

includedintra

‐arearoutes.Theforwardingaddressis0.

Otheractionsimplementedbythiscommandinclude:

•Asummaryrangebecomesactiveifitincludesatleastoneintra‐arearoutebeingleakedinto

thearea.

•Adiscardrouteisinstalledforanactivesummaryrange.Conversely,whenitbecomes

inactive,thediscardrouteis

removed.

•Thecostofthesummaryrangeisthehighestcostamongallleakedintra‐arearoutes.

•SNMPsupportsarearangeviaMIBobjectospfAreaRangeTableasdefinedinRFC‐1850.

Syntax

area area-id range ip-address mask [advertise][not-advertise]

Syntax of the “no” Form

Thenoformofthiscommandbarsroutesfrombeingsummarized:

no area area-id range address mask

Note: You should avoid needless reorigination of Type-3 Link-State Advertisements (LSAs). For

example, leaking intra-area routes which do not change the cost of a summary will re-origination the

summary LSA.

area-id

Areaattheboundaryofwhichrouteswillbesummarized.Validvalues

aredecimalsorIPaddresses.

ip-address

Commonprefixofsummarizednetworks.

mask

Lengthofthecommonprefix.

advertise

BroadcastsasingleType‐3LSAforallintra‐arearoutesleakedintothis

areaandincludedinthesummaryrange.

not-advertise

SuppressesType‐3LSA generationforallroutesinthesummaryrange.

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