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Enterasys Networks XSR CLI Router User Manual

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BGP Set Commands

6-118 Configuring the Border Gateway Protocol

XSR(config)#router bgp 100

XSR(config)#bgp dampening route-map 1

set ip next-hop

Thiscommandspecifieswheretooutputpacketsthatpassamatchclauseofaroutemapfor

policyrouting.ItmodifiesthevalueofthenexthopattributeinaBGProutingupdatemessage.

Thenext‐hopattributeidentifiesthenexthoptoreacharoute.Next‐hopforanEBGP

sessionisthe

IPaddressoftheBGPneighborthatannouncedtheroute.Next‐hopforIBGPsessionsiseitherthe

BGPneighborthatannouncedtheroute(forroutesthatoriginateinsidetheAS)ortheBGP

neighborfromwhichtheroutewaslearned (forroutesinjectedintotheAS via

EBGP).

Syntax

set ip next-hop value

Syntax of the “no” Form

Thenoformofthiscommandremovesthenexthopvalue:

no set ip next-hop value

Mode

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

Example

ThefollowingexamplesetstheIPnexthopattributeintheBGPupdatewhichmatches10.0.0.0

255.0.0.0to1.2.3.4:

XSR(config)#access-list 10 permit 10.0.0.0 255.0.0.0

XSR(config)#route-map 1 permit 1

XSR(config-route-map)#match ip address 10

XSR(config-route-map)#set ip next-hop 1.2.3.4

set local-preference

ThiscommandmodifiesthevalueofthelocalpreferenceattributeinaBGProutingupdate

message.ThisparameterimpactstheBGProuteselectionprocessfortrafficleavinganAS.Besure

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

Localpreferenceindicatesprioritygiventoaparticularroutewhen morethanone

routeexiststo

thesamedestination.Ahigherlocalpreferenceindicatesamorepreferredroute.Localpreference

islocaltothisautonomoussystemandisexchangedonlywithIBGPpeers.

Syntax

set local-preference value

value

ThenexthopIPaddress.

value

Preferencevalue,rangingfrom0to2147483647.

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