使用VLAN扩展交换网络.ppt

VTP协议

(VLANTrunkingProtocol)一个能够宣告VLAN配置信息的信息系统通过一个共有的管理域，维持VLAN配置信息的一致性VTP只能在主干端口发送要宣告的信息VTP模式服务器模式客户模式透明模式发送/转发

信息宣告同步不会存贮于NVRAM创建vlan修改vlan删除vlan发送/转发

信息宣告同步存贮于NVRAM创建vlan修改vlan删除vlan转发

信息宣告不同步存贮于NVRAMCatalystswitches上默认的VTP模式是服务器模式，在向VLAN中增加一台交换机时必须注意这一点。?2009,CopyrightICND2?2009,CopyrightICND2?2002.张羿1-*?2002.张羿1-*Slide1of1Purpose:Emphasize:AVLANisabroadcastdomain.Note:Inordertohaveinter-vlancommunications,arouterisrequired.Slide1of3Purpose:Emphasize:EachportontheswitchcanbeassignedtoaVLAN.Bydefault,allportsareinVLAN1,afactorydefaultVLAN.Slide2of3Purpose:Emphasize:ToallowVLANstospanacrossmultipleswitches,theconnectionbetweentheswitchesmustbelongtomulitpleVLANs.Slide3of3Purpose:Emphasize:Atrunkisusedtoconnecttwoswitchestogether.AtrunkcarriestrafficformultipleVLANs.Onlythefastethernetportsonthe1900canbeconfiguredastrunkport.Trunkingisoffbydefaultonthe1900fastethernetports(fa0/26andfa0/27).Note:The1900supportsDISL.Atthetimeofthebeta,thecoreswitch(2900xl)doesn’tsupportDISL.Slide1of1Purpose:Emphasize:Note:SinceISLtechnologyisimplementedinASICs,framesaretaggedatwirespeed.ThenumberofVLANssupportedbyaswitchdependsontheswitchhardware.TheCatalyst1900ensupports64activeVLANswithaninstanceofSTPperVLAN.PVST=PerVLANSpanningTree.PVSTisaCiscoproprietaryimplementation.ItrequiresCiscoISLencapsulationinordertowork.Slide1of1Purpose:Emphasize:Notes:VTPisaCiscoproprietrayfeature.VTPisaLayer2messagingprotocolthatmaintainsVLANconfigurationconsistencybymanagingtheaddition,deletion,andrenamingofVLANsonanetwork-widebasis.VTPminimizesmisconfigurationsandconfigurationinconsistenciesthatcancauseseveralproblems,suchasduplicateVLANnames,incorrectVLA