Chapter15
VBASConfiguration
TableofContents
VBASOverview...............................................................149
ConguringVBAS............................................................149
VBASCongurationExample.............................................150
VBASMaintenanceandDiagnosis......................................150
VBASOverview
VBAS(VBAS)protocolisanextendedinquiryprotocolbetween
IP-DSLAMandBRASequipment.BRASandIP-DSLAMusepoint-
to-pointlinktocommunicate.Portinformationinquiryandre-
sponsemessageareencapsulatedinlayer-2Ethernetdataframe.
CongurecorrespondingDigitalSubscriberLineAccessMultiplexer
(DSLAM)ofVLANonBAS;inthecourseofPPPoEcalling,start
VBASprotocol,thatis,mappingtocorrespondingDSLAMaccord-
ingtotheVLANinuserband;BASstartuserlineidentierinquiry
toDSLAM;DSLAMgiveuserlineidentierresponsetoBAS.Inthis
manual,theswitchesareDSLAMs.
VBASfunctionisimplementedbysendingVBASmessagesbe-
tweenBASandDSLAM.
ConfiguringVBAS
TocongureVBAS,performthefollowingsteps.
Step
CommandFunction
1
ZXR10(config)#vbasenableThisenablesVBASglobally
2
ZXR10(config-vlan)#vbasenable
ThisenablesVBASfunctionin
adesignatedVLAN
3
ZXR10(config-if)#vbastrust
ThisconguresaVBAS
4
ZXR10(config-if)#vbasport-type{user|net}
Thisconguresadesignated
portasVBASuserportor
networkport
CondentialandProprietaryInformationofZTECORPORATION149