03hcie rs和参考21ldp协议原理

1、LDP协议原理前言本课程了LDP空间、分发协议、LDP邻居协议工作原理以及在、QoS和流量工程方面的应用。Page1培训目标学完本课程后，您应该能：l 描述LDP邻居发现机制l 描述LDP会话建立过程l 掌握LDP管理Page2目录LDP邻居发现和会话建立管理LDPPage3目录LDP邻居发现和会话建立1.1 LDP基本概念1.2 LDP邻居发现机制1.3 LDP会话建立过程Page4LDP基本概念LDP PeerLDP PeerLDP PeerLDP SessionLDP SessionLDP SessionSWDSWASWBSWC10.1.0.0/2410.2.0.0/24l LDP是用来

2、在LSR之间建立LDP Session 并交换Label/FEC的协议。Page51024/10.2.0.01024/10.1.0.0LDP消息类型Discovery message: 宣告和维护网络中一个LSR的。Session message: 建立、维护和终止LDP Peers之间的LDP Session。Advertisement message: 生成、改变和删除FEC的射。映Notification message: 宣告告警和错误。20B20B/8BVariablePage6IP HeaderTCP/UDPHeaderLDP PDULDP消息类型与封装格式20B20B/8B10B

3、Variable2B2B6B2B2B4BVariableVariablePage7UTypeMessage LengthMessage IDMandatory ParametersOptional ParametersVersionPDULengthLDP IdentifierIP HeaderTCP/UDPHeaderLDPHeaderLDP MessageLDP消息作用DiscoveryMessageSession MessageAdvertisement MessageNotification MessagePage8消息类型作用HelloLDP发现机制中宣告本LSR并发现邻居Initi

4、alization在LDP Session建立过程中协商参数KeepAliveLDP Session的TCP连接的完整性Address宣告接口地址Address Withdraw撤消接口地址Label Map宣告FEC/LabelLabel Request请求FEC的Label Abort Request终止未完成的Label Request MessageLabel Withdraw撤消FEC/LabelLabel ReleaseNotification通知LDP Peer错误目录LDP邻居发现和会话建立1.1 LDP基本概念1.2 LDP邻居发现机制1.3 LDP会话建立过程Page9LD

5、P发现机制LDP SessionLDP SessionLDP SessionSWDSWASWBSWCLDP Remote Session10.2.0.0/2410.1.0.0/24LDP基本发现机制LDP扩展发现机制发现直接连接在同一链发现非直连的LSR邻居。的LSR邻居。Page10LDP基本发现机制SWASWB1.1.1.1/322.2.2.2/32Hello Message (1.1.1.1:any port224.0.0.2:646)Hello Message (2.2.2.2:any port224.0.0.2:646)Establish TCP Connection (2.2.2.

6、2:any port1.1.1.1:646)Page11LDP扩展发现机制SWASWBSWC1.1.1.1/32./32Hello Message (1.1.1.1:any port3.3.3.3:646)Hello Message (3.3.3.3:any port1.1.1.1:646)Establish TCP Connection (3.3.3.3:any port1.1.1.1:646)Page12目录LDP邻居发现和会话建立1.1 LDP基本概念1.2 LDP邻居发现机制1.3 LDP会话建立过程Page13LDPSession建立和维护SWASWB1.1.1.1/322.2.2.

7、2/32Establish TCP Connection(2.2.2.2:any port1.1.1.1:646)Initialization Message (2.2.2.2:any port1.1.1.1:646)Initialization Message (1.1.1.1:any port2.2.2.2:646)KeepAlive Message (1.1.1.1:any port2.2.2.2:646)KeepAlive Message (2.2.2.2:any port1.1.1.1:646)LDP Session EstablishedPage14LDPSession建立和维护S

8、WASWB1.1.1.1/322.2.2.2/32Establish TCP Connection (2.2.2.2:any port1.1.1.1:646)Initialization Message (2.2.2.2:any port1.1.1.1:646)Session Rejected/ Parameters Error Notification message(1.1.1.1:any port2.2.2.2:646)TCP ConnectiondPage15本地LDP会话基本配置SWAmpls lsr-id 1.1.1.1 SWAmplsSWBmpls lsr-id 2.2.2.2

9、SWBmplsSWB-mplsmpls ldp SWBinterface v1 SWB-Vlanif1mplsSWA-mplsmplsSWAinterfaceldpv1SWA-Vlanif1mplsSWA-Vlanif1mplsldpSWB-Vlanif1mplsldpLDP Session v110.1.1.2/30SWDSWASWBSWC v210.1.1.6/30 v3 10.1.1.10/3010.1.1.1/30v110.1.1.5/30v210.1.1.9/30v310.2.0.0/2410.1.0.0/24Page16本地LDP会话基本配置SWAdisplaympls ldp s

10、essionLDPSession(s) in Public NetworkPeer-IDStatusLAMSsnRoleSsnAgeKA-Sent/Rcv2.2.2.2:0OperationalDUPassive000:00:1042/42LAM : LabelAdvertisement ModeSsnAge Unit : DDD:HH:MMLDP Session v110.1.1.2/30SWASWBSWCSWD v2 10.1.1.6/30 v310.1.1.10/30v1v2v310.1.1.1/3010.1.1.5/3010.1.1.9/3010.1.0.0/2410.2.0.0/24

11、Page17本地LDP会话基本配置SWAdisplay mpls ldp sessionverboseLDPSession(s)in PublicNetworkPeer LDP ID TCP Connection Session State Session FT Flag Reconnect Timer:2.2.2.2:0Local LDP ID:1.1.1.1:01.1.1.1 <-2.2.2.2OperationalSession Role MD5 Flag Recovery Timer:PassiveOff-Off-Negotiated Keepalive Timer Keepal

12、ive Message Sent/Rcvd Label Advertisement ModeLabel Resource Status(Peer/Local)Session Age:45Sec288/288 (Message Count)Downstream Unsolicited Available/Available 000:01:11 (DDD:HH:MM)Addresses received from peer: (Count: 3)10.1.1.22.2.2.210.1.1.5Page18本地LDP会话基本配置SWBmpls lsr-id 2.2.2.2SWBmplsSWB-mpls

13、mpls ldp SWBinterface v1 SWB-Vlanif1mpls SWB-Vlanif1mpls ldpSWAmpls lsr-id 1.1.1.1 SWAmplsSWA-mplsmpls ldp SWAinterface v1 SWA-Vlanif1mpls SWA-Vlanif1mpls ldpSWA-Vlanif1mpls ldp address v1transport-SWA-Vlanif1mpls ldpaddress v1transport-LDP Session v110.1.1.2/30SWDSWASWBSWC v210.1.1.6/30 v310.1.1.10

14、/3010.1.1.1/30v110.1.1.5/30v210.1.1.9/30v310.2.0.0/2410.1.0.0/24Page19本地LDP会话基本配置SWAdis mpls ldp session verboseLDPSession(s) in PublicNetworkPeer LDP ID TCP Connection Session State Session FT Flag Reconnect Timer:2.2.2.2:010.1.1.1 <- Operational Off-Local LDP ID:1.1.1.1:010.1.1.2Session Role MD

15、5 Flag Recovery Timer:PassiveOff-Negotiated Keepalive Timer Keepalive Message Sent/Rcvd Label Advertisement ModeLabel Resource Status(Peer/Local)Session Age:45Sec2/2 (Message Count)Downstream UnsolicitedAvailable/Available000:00:00 (DDD:HH:MM)Addresses received from peer: (Count: 3)10.1.1.210.1.1.52

16、.2.2.2-Page20远端LDP会话基本配置SWAmpls lsr-id 1.1.1.1 SWAmplsSWA-mplsmpls ldpSWAmpls ldp remote-peerSWCmpls lsr-id 3.3.3.3 SWCmplsSWC-mplsmpls ldpSWCmpls ldp remote-peer testSWC-mpls-ldp-remote-testremote-ip1.1.1.1testSWA-mpls-ldp-remote-testremote-ip3.3.3.3SWDSWASWBSWC v110.1.1.2/30 v2 10.1.1.6/30 v3 10.1

17、.1.10/3010.1.1.1/30v110.1.1.5/30v210.1.1.9/30v3LDP Remote Session10.1.0.0/2410.2.0.0/24Page21远端LDP会话基本配置<SWA>displaymplsldp peerLDPPeerInformation in Public networkPeer-IDTransport-AddressDiscovery-Source3.3.3.3:03.3.3.3Remote Peer :testSWAdisplaymplsldp sessionLDPSession(s) in Public NetworkP

18、eer-IDStatusLAMSsnRoleSsnAgeKA-Sent/Rcv3.3.3.3:0OperationalDUPassive000:00:1979/79LAM : LabelAdvertisement ModeSsnAge Unit : DDD:HH:MMPage22LDP状态机Session建立收到Init以外的消息或超时收到的消息不是KeepAlive 或超时方收到init消息发送init和KeepAlive主动送init消息收到init外的消息或超时收到Init消息发送KeepAlive消息收到KeepAlive收到shutdown消息或超时收到shutdown或超时发送sh

19、utdown其他LDP消息Page23OPERATIONALOPENSENTOPENRECINITIALIZEDNON EXISTENTLDP状态机案例分析<SWB>terminal monitor<SWB>terminal debuggingLDP Session<SWB>debug mpls ldp sessionSWASWB*0.12902062Link Hello Vlanif1*0.12902062SWB LDP/8/Session:Vlanif1 v110.1.1.2/30message received on interface:10.1.1.

20、1/301.1.1.1/30v12.2.2.2/30Non-ExistentSWB LDP/8/Session:Created session with LSR: 1.1.1.1*0.12902062Link Hello Vlanif1*0.12902062SWB LDP/8/Session: Vlanif1message sent on interface:TCP connection establishedInitializedSWB LDP/8/Session: Vlanif1Session(1.1.1.1,Active role) start toopen TCP connection

21、.*0.12902062 SWB LDP/8/Session: Vlanif1Session(1.1.1.1)'s state changed from Non-existent to Initialized.Page24LDP状态机案例分析*0.12906969 SWB LDP/8/Session: Vlanif1Link Hello message received on interface: Vlanif1.%Jul 24 12:07:11 2006 SWB LDP/5/LOG:Received TCP Up Event for TCP SockId*0.12931844 SWB

22、 LDP/8/Session:LDP SessionSWASWB v110.1.1.2/30v110.1.1.1/3022.2.2.2/30Non-ExistentTCP up event received for socket Id: 2*0.12931844 SWB LDP/8/Session: Vlanif1TCP connectionestablishedSession(1.1.1.1) start to send init on Initialized state.*0.12931844 SWB LDP/8/Session:Session Init message sent to L

23、SR: 1.1.1.1msgInitializedActive Role, Tx Init MsgOpenSent*0.12931844 SWB LDP/8/Session: Vlanif1Session(1.1.1.1)'s state changed from Initialized to Open Sent.Page25LDP状态机案例分析LDP SessionSWASWB#Jul 24 12:07:11 2006 SWBLDP/5/SessionUp: Session(1.1.1.1:0. public Instance)'sstate change to Up*0.1

24、2931969 SWB LDP/8/Session: Vlanif1Session(1.1.1.1) received init msg in Open Sent state.*0.12931969 SWB LDP/8/Session: Vlanif1Sent keep alive message to LSR: 1.1.1.1.*0.12931969 SWB LDP/8/Session: Vlanif1Session(1.1.1.1)'s state changed from Open sent to Open received.*0.12931969 SWB LDP/8/Sessi

25、on: Vlanif1Session(1.1.1.1) received keep alivemessage on Open Received state.*0.12931969 SWB LDP/8/Session: Vlanif1Session(1.1.1.1)'s state changed from Open received to operational. . v110.1.1.2/30v110.1.1.1/302.2.2.2/30Non-ExistentTCP connectionestablishedInitializedActive Role, Tx Init MsgOp

26、enSentRx Acceptable Init MsgOpenRecRx Keepalive MsgOperationalPage26目录LDP邻居发现和会话建立管理LDPPage27目录LDP邻居发现和会话建立空间分发2.1 LDP2.2 LDP2.3 LDP2.4 LDP2.5 PHP保持Page28LDP空间20B20B/8B10BVariable2B2B6B4B2Bx00:基于平台的空间Page29Lsr-idLabelSpaceVersionPDULengthLDP IdentifierIP HeaderTCP/UDPHeaderLDPHeaderLDP MessageVRP空间S

27、WAdis mpls ldp session verboseLDPSession(s)in PublicNetworkPeer LDP ID:2.2.2.2:0Local LDP ID:1.1.1.1:0TCP Connection:1.1.1.1 <-2.2.2.2Session State:OperationalSession Role MD5 Flag Recovery Timer:PassiveOff-Session FT Flag :Reconnect Timer :Off-Negotiated Keepalive Timer Keepalive Message Sent/Rc

28、vd Label Advertisement ModeLabel Resource Status(Peer/Local)Session Age:45Sec288/288 (Message Count)Downstream Unsolicited Available/Available 000:01:11 (DDD:HH:MM)Addresses received from peer: (Count: 3)10.1.1.22.2.2.210.1.1.5Page30基于平台的空间<SWC>display mpls lsp include 10.1.0.024<SWE>dis

29、play mpls lsp include 10.1.0.024-LSPInformation:LDP LSPLSP Information: LDP LSP-Name-FEC 10.1.0.0/2410.1.0.0/24In/Out Label NULL/1029 1032/1029In/OutIFVrfFEC 10.1.0.0/2410.1.0.0/24In/Out Label 1032/10291032/1029In/Out IFVrfName-/Vlanif2-/Vlanif2-/Vlanif4-/Vlanif32.2.2.2/32SWBv23.3.3.3/32SWCv34.4.4.4

30、/32SWD1.1.1.1/32SWAv110.1.1.0/30Label 1029v210.1.1.4/30v1v310.1.1.8/3010.2.0.0/2410.1.0.0/24MPLS DomainSWEPage31基于平台的空间<SWE>display mpls ldp session | include 2.2.2.2SWBdisplay mpls lsp include10.1.0.0 24LDP Session(s) in Public NetworkPeer-IDStatusLAM SsnRole SsnAgeKA-Sent/RcvLSP Information:

31、LDPLSP-2.2.2.2:0 Operational DUActive000:03:39877/877FEC 10.1.0.0/2410.1.0.0/24In/Out Label NULL/3 1029/3In/Out IF-/Vlanif1Vrf NameLAM : Label AdvertisementDDD:HH:MMMode SsnAge Unit :-/Vlanif12.2.2.2/32SWBv23.3.3.3/32SWCv34.4.4.4/32SWD1.1.1.1/32SWAv110.1.1.0/30Label 1029v210.1.1.4/30v1v310.1.1.8/301

32、0.1.0.0/2410.2.0.0/24MPLS DomainSWE5.5.5.5/32Page32基于平台的空间SWBdisplaympls lsp include 10.1.0.0 24-LSP Information:LDP LSP-FEC10.1.0.0/2410.1.0.0/24In/Out NULL/3 1029/3LabelIn/Out IF-/Vlanif1-/Vlanif1VrfName2.2.2.2/32SWBv23.3.3.3/32SWCv34.4.4.4/32SWD1.1.1.1/32SWAv110.1.1.0/30Label 1029v210.1.1.4/30v1v

33、310.1.1.8/3010.2.0.0/2410.1.0.0/24MPLS DomainSWE5.5.5.5/32Page33目录LDP邻居发现和会话建立空间分发2.1 LDP2.2 LDP2.3 LDP2.4 LDP2.5 PHP保持Page34分发DU2.2.2.2/322.2.2.2/1029 SWB3.3.3.3/32SWC4.4.4.4/32SWD1.1.1.1/32SWA2.2.2.2/1029 v1v1 10.1.1.0/30 v2v2 10.1.1.4/30 v3v3 10.1.1.8/301.1.1.1/1029MPLS Domain10.1.0.0/103010.1.0.

34、0/2410.2.0.0/24Page35分发DoD2.2.2.2/322.2.2.2/1029SWB3.3.3.3/32SWC4.4.4.4/32SWD1.1.1.1/32SWA v1v1 10.1.1.0/30 v2v2 10.1.1.4/30 v3v3 10.1.1.8/302.2.2.2/LabelMPLS Domain1.1.1.1/Label10.2.0.0/2410.1.0.0/241.1.1.1/1029 10.1.0.0/Label10.1.0.0/1029Page36分发配置实例与分析SWAmplsSWA-mpls lsp-trigger noneSWCmplsSWC-mp

35、ls lsp-triggernoneSWBinterface v2 SWB-Vlanif2mpls ldp SWBmplsSWB-mplslsp-triggeradvertisementdodhost2.2.2.2/323.3.3.3/32SWC4.4.4.4/32SWD1.1.1.1/32SWAv1SWBDODDUv1v2 v3v3 10.1.1.8/30v210.1.1.4/3010.1.1.0/30MPLS Domain10.2.0.0/2410.1.0.0/24Page37分发配置实例与分析<SWA>display mpls ldp lspLDP LSP Informati

36、onSWB-mplsdis mpls lsp-LSP Information: LDP LSP-SN DestAddress/Mask In/OutLabel Next-Hop In/Out-IF*12.2.2.2/32LiberalFEC2.2.2.2/32In/Out Label3/NULLIn/Out IF-/-Vrf NameA '*' before an LSP means the LSP is not established A '*' before a Label means the USCB or DSCB is stale2.2.2.2/323

37、.3.3.3/32SWC4.4.4.4/32SWD1.1.1.1/32SWAv1SWBDODDUv1v2 v3v3 10.1.1.8/30v210.1.1.4/3010.1.1.0/30MPLS Domain10.1.0.0/2410.2.0.0/24SWC-mplsdisplay mpls ldp lspSWC-mplsPage38目录LDP邻居发现和会话建立空间分发2.1 LDP2.2 LDP2.3 LDP2.4 LDP2.5 PHP保持Page39IndependentDoD+Independent2.2.2.2/32SWB3.3.3.3/32SWC4.4.4.4/32SWD1.1.1.

38、1/32SWA1.1.1.1/Label1.1.1.1/Label1.1.1.1/Label v1v1 10.1.1.0/301.1.1.1/3 v2v2 10.1.1.4/301.1.1.1/1029 v3v3 10.1.1.8/301.1.1.1/1029MPLS Domain10.2.0.0/2410.1.0.0/24Page40IndependentDU+Independent2.2.2.2/32SWB3.3.3.3/32SWC4.4.4.4/32SWD1.1.1.1/32SWA v1v1 10.1.1.0/30 v2v2 10.1.1.4/301.1.1.1/1029 v3v3 10

39、.1.1.8/301.1.1.1/1029MPLS Domain10.2.0.0/2410.1.0.0/24Page41OrderedDoD+Ordered2.2.2.2/32SWB3.3.3.3/32SWC4.4.4.4/32SWD1.1.1.1/32SWA1.1.1.1/Label1.1.1.1/Label1.1.1.1/Label v1v1 10.1.1.0/301.1.1.1/3 v2v2 10.1.1.4/301.1.1.1/1029 v3v3 10.1.1.8/301.1.1.1/1029MPLS Domain10.2.0.0/2410.1.0.0/24Page42OrderedD

40、U+Ordered2.2.2.2/32SWB3.3.3.3/32SWC4.4.4.4/32SWD1.1.1.1/32SWA v1v1 10.1.1.0/301.1.1.1/3 v2v2 10.1.1.4/301.1.1.1/1029 v3v3 10.1.1.8/301.1.1.1/1029MPLS Domain10.2.0.0/2410.1.0.0/24Page43分发和方式实例分析SWAmplsSWA-mpls lsp-trigger noneSWCmplsSWC-mpls lsp-trigger noneSWBmplsSWB-mplslsp-trigger allSWB-mplsmpls

41、ldpSWB-mpls-ldplabel-distribution independent2.2.2.2/323.3.3.3/32SWCv34.4.4.4/32SWD1.1.1.1/32SWAv1SWBDUDUDUv1v2v3v210.1.1.4/3010.1.1.8/3010.1.1.0/30MPLS Domain10.1.0.0/2410.2.0.0/24DU+IndependentPage44分发和方式实例分析SWCdisplay mpls lspSWBdisplay mpls lspLSP Information: LDP LSPLSP Information: LDP LSPFEC

42、1.1.1.1/322.2.2.2/3210.1.0.0/24.In/Out Label In/Out IFVrf Name 1025/1024-/Vlanif2FEC2.2.2.2/321.1.1.1/3210.1.0.0/24.In/Out Label3/NULL1024/NULL1027/NULLIn/Out IF-/-/-/-Vrf Name1024/31026/1027-/Vlanif2-/Vlanif22.2.2.2/323.3.3.3/32SWCv34.4.4.4/32SWD1.1.1.1/32SWAv1SWBDUDUDUv1v2v3v210.1.1.4/3010.1.1.8/3

43、010.1.1.0/30MPLS DomainDU+Independent10.2.0.0/2410.1.0.0/24Page45分发和方式实例分析SWBmplsSWB-mplslsp-trigger all SWB-mplsmpls ldpSWB-mpls-ldplabel-distribution ordered2.2.2.2/323.3.3.3/32SWCv34.4.4.4/32SWD1.1.1.1/32SWAv1SWBDUDUDUv1v2v3v210.1.1.4/3010.1.1.8/3010.1.1.0/30MPLS Domain10.2.0.0/2410.1.0.0/24DU+Or

44、deredPage46分发和方式实例分析<SWB>dis mpls lspLSP Information: LDP LSPFEC 2.2.2.2/32.In/Out Label In/Out IFVrf Name3/NULL-/-2.2.2.2/323.3.3.3/32SWCv34.4.4.4/32SWD1.1.1.1/32SWAv1SWBDUDUDUv1v2v3v210.1.1.4/3010.1.1.8/3010.1.1.0/30MPLS Domain10.2.0.0/2410.1.0.0/24DU+OrderedPage47目录LDP邻居发现和会话建立空间分发2.1 LDP2.

45、2 LDP2.3 LDP2.4 LDP2.5 PHP保持Page48保持Conservative2.2.2.2/32SWBv23.3.3.3/32SWCv34.4.4.4/32SWD1.1.1.1/32SWAv110.1.1.0/30Label 1029v2 10.1.1.4/30v1v310.1.1.8/3010.1.0.0/2410.2.0.0/24MPLS DomainSWEDiscardPage49保持Liberal2.2.2.2/32SWBv23.3.3.3/32SWCv34.4.4.4/32SWD1.1.1.1/32SWAv110.1.1.0/30Label 1029v2 10.1

46、.1.4/30v1v310.1.1.8/3010.2.0.0/2410.1.0.0/24MPLS DomainSWEPage50保持配置实例与分析<SWC>display ip routing-table 10.1.0.0 Routing Table : PublicSummary Count : 1Destination/MaskProto Pre CostNextHopInterface Vlanif210.1.0.0/24 OSPF10 468610.1.1.52.2.2.2/32SWBv23.3.3.3/32SWCv34.4.4.4/32SWD1.1.1.1/32SWAv1

47、10.1.1.0/30Label 1029v2 10.1.1.4/30v1v310.1.1.8/3010.2.0.0/2410.1.0.0/24MPLS DomainSWEPage51保持配置实例2.2.2.2/32SWBv23.3.3.3/32SWCv34.4.4.4/32SWD1.1.1.1/32SWAv110.1.1.0/30Label 1025v210.1.1.4/30v1v310.1.1.8/3010.2.0.0/2410.1.0.0/24MPLS DomainSWEPage52保持配置实例(SWC)<SWC>display mpls ldp lsp| includeLDP LSP10.1.0.0Information-SNDestAddress/MaskIn/OutLabelNext-HopIn/Out-Interface-1011*1210.1.0.0/2410.1.0.0/24