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MPLS-VPN标签交换原理By-勤毅队MPLS-VPN标签交换原理......................................................................................................1MPLS简述...........................................................................................................................2MPLS-VPN简介..................................................................................................................21.PE路由器..........................................................................................................22.P路由器:.........................................................................................................23.CE路由器:......................................................................................................24.VPN-IPV4地址:...............................................................................................35.路由区分符RD:...............................................................................................36.路由目标RT:...................................................................................................37.VPN路由转发表(VRF):..............................................................................3MPLS基本概念...................................................................................................................31.转发等价类FEC...................................................................................................32.标签(label...........................................................................................................33.标签交换路由器LSR............................................................................................44..标签交换路径LSP.............................................................................................45.标签分发协议LDP................................................................................................56.LSR........................................................................................................................57.LER........................................................................................................................68.倒数第二跳弹出(PHP/PenultimateHopPopping)...........................................6标签转发表产生过程............................................................................................................61.路由器之间通过路由协议或静态路由产生路由表。..............................................62.运行MPLS的路由器为路由表中的路由分配标签。..............................................73.通过LDP/RSVP协议发现其MPLS邻居。...........................................................74.将打标签的路由通告给其MPLS邻居。................................................................75.路由器将其下一跳路由器(单播路由表)通告的标签加到其转发表中。..............76.路由器只将其下一跳路由器通告的标签加到其转发表中。...................................7IP包在MPLS网络中转发过程............................................................................................81.MPLS入口路由器根据目的地址查找路由表。......................................................82.将该IP包打上标签,转发给下一跳路由器。.........................................................83.下一跳路由器查找其转发表,替换标签,继续转发。............................................84.出口路由器查找其转发表,发现其就是目的地网络,弹出标签,送给相应端口处理。......................................................................................................................................9
MPLS简述MPLS(