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Enterasys Networks XSR CLI Router User Manual

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BGP Set Commands

XSR CLI Reference Guide 6-119

Syntax of the “no” Form

Thenoformofthiscommandremovesthelocalpreferencevalue:

no set local-preference value

Mode

Route‐mapconfiguration:XSR(config-route-map)#

Default

Preferencevalue:100.

Example

Thefollowingexampleconfiguresthesetlocal‐preferencevalueinthecontextofconfiguringa

routemapandmatch:

XSR(config)#route-map 1 permit 1

XSR(config-route-map)#match as-path 37

XSR(config-route-map)#set local-preference 400

Routemap1usesthematchas‐pathcommandthatisreferencinganas‐pathaccesslist37.Thislist

identifiestheBGProutingupdatestowhichthesetlocal‐preferencecommandwillapply.The

relevantupdateswillhavethevalueoftheir localpreferencesetto400,whichis

higherthanthe

defaultof100.AssumingthatalloftheBGProuteselectioncriteriaremainthesame,theroutes

withthehighestlocalpreferencewillbechosenasthebestroutestotheidentifieddestinations.

This,however,appliesonlyinmulti‐homedASsasthelocalpreferenceattributeimpacts

only

whichwaythetrafficleavesanASiftherearemultipleexitpointsfromit.

set metric

Thiscommandmodifiesthemetricassociatedwithroutesthatmatchaparticularroutemap.This

commandcanalsobeusedtomanipulatethevalueoftheMEDformatchingBGProutes.Besure

thatamatchclausehasbeenspecified.

Metricsarevaluesthattherouterusestoindicatepreferredpaths

tonetworks.Updateswithnon‐

zerometricsareusedforrouteselectioninsidetheAS.BGPautomaticallycomparesmetricsfor

routestointernalneighbors.Youcan usemetrictoselectthebestpathwhentherearemultiple

alternatives.Routeswithlowermetricvaluesaremorepreferred.

Syntax

set metric metric-value

Syntax of the “no” Form

Thenoformofthiscommandremovesthemetricvalue:

no set metric metric-value

metric-value

Thevalueofthemetric,rangingfrom0to2,147,483,647.

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