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Enterasys Networks XSR CLI Router User Manual

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BGP Configuration Commands

6-84 Configuring the Border Gateway Protocol

•Networks

•Neighborparameters

• Routingpolicies

Syntax

router bgp autonomous-system

Syntax of the “no” Form

Thenoformofthiscommandsetsthedefaultparameter‐disabled:

no router bgp autonomous-system

Mode

Globalconfiguration:XSR(config)#

Examples

ThefollowingexampleactivatestheBGProutingprocessonarouterbelongingtoAS100.Note

thattheXSRacquiresRouterconfigurationmodeafterexecutingthecommand:

XSR(config)#router bgp 100

XSR(config-router)#

ThefollowingexampledisplaysanerrormessagewhenyoutrytoactivateanotherBGPprocess

whenoneisalreadyrunning.InthisexampletheBGPprocesswasalreadyactivatedwithAS100

whenanattemptwasmadetoactivateitagainwiththeAS11.

XSR(config)#router bgp 11

% BGP Already running in AS 100

aggregate-address

ThiscommandcreatesanaggregateentryinaBGProutingtablewhichisusefulforreducingthe

numberofadvertisedroutesbetweenBGProuters.Anaggregateentryinthetableisasingle

summarizedroutethatrepresentsmultiple,morespecificroutes.

Atleastoneofthemorespecificroutesbeingaggregated

mustexistinthetableforthiscommand

totakeeffect.

Syntax

aggregate-address address mask [as-set][summary-only] [advertise-map map-

name][attribute-map map-name]

autonomous-system

TheXSR’sAutonomousSystem(AS)number,rangingfrom1to65,535.

TheASnumberisincludedinroutingupdatestradedbyBGProuters.

address

TheaggregateIPaddress.

mask

TheaggregateIPmask.

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