第9章 MPLS和MPLS VPN-9.1 MPLS基础

3.LDP

LDP标签分发协议，交换FEC与标签的映射，完成LSP建立。

1）R1配置

[R1]interface GigabitEthernet 0/0/0
[R1-GigabitEthernet0/0/0]IP address 12.1.1.1 8
[R1]interface LoopBack 0
[R1-LoopBack0]ip address 1.1.1.1 32
[R1]ospf 1 router-id 1.1.1.1
[R1-ospf-1]area 0
[R1-ospf-1-area-0.0.0.0]network 12.1.1.0 0.255.255.255
[R1-ospf-1-area-0.0.0.0]network 1.1.1.1 0.0.0.0

[R1]mpls ls
[R1]mpls lsr-id 1.1.1.1
[R1-mpls]quit
[R1]mpls ldp
[R1]interface GigabitEthernet 0/0/0
[R1-GigabitEthernet0/0/0]mpls 
[R1-GigabitEthernet0/0/0]mpls ldp  

2）R2配置

[R2]interface GigabitEthernet 0/0/0
[R2-GigabitEthernet0/0/0]ip address 12.1.1.2 8
[R2]interface GigabitEthernet 0/0/1
[R2-GigabitEthernet0/0/1]ip address 23.1.1.2 8
[R2]interface LoopBack 0
[R2-LoopBack0]ip address 2.2.2.2 32

[R2]ospf 1 router-id 2.2.2.2 
[R2-ospf-1]area 0
[R2-ospf-1-area-0.0.0.0]network 12.1.1.0 0.255.255.255
[R2-ospf-1-area-0.0.0.0]network 23.1.1.0 0.255.255.255
[R2-ospf-1-area-0.0.0.0]network 2.2.2.2 0.0.0.0

[R2]mpls lsr-id 2.2.2.2
[R2]mpls 
[R2-mpls]quit
[R2]mpls ldp 
[R2-mpls-ldp]quit

[R2]interface GigabitEthernet 0/0/0
[R2-GigabitEthernet0/0/0]mpls 
[R2-GigabitEthernet0/0/0]mpls ldp 
[R2-GigabitEthernet0/0/0]quit
[R2]interface GigabitEthernet 0/0/1
[R2-GigabitEthernet0/0/1]mpls                            
[R2-GigabitEthernet0/0/1]mpls ldp 

3）R3配置

[R3]interface GigabitEthernet 0/0/0
[R3-GigabitEthernet0/0/0]ip address 23.1.1.3 8
[R3]interface GigabitEthernet 0/0/1
[R3-GigabitEthernet0/0/1]ip address 34.1.1.3 8
[R3]interface LoopBack 0
[R3-LoopBack0]ip address 3.3.3.3 32

[R3]ospf 1 router-id 3.3.3.3
[R3-ospf-1]area 0
[R3-ospf-1-area-0.0.0.0]network 23.1.1.0 0.255.255.255 
[R3-ospf-1-area-0.0.0.0]network 34.1.1.0 0.255.255.255
[R3-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0.0.0 

[R3]mpls lsr-id 3.3.3.3
[R3-mpls]quit
[R3]mpls ldp 
[R3]interface GigabitEthernet 0/0/0
[R3-GigabitEthernet0/0/0]mpls
[R3-GigabitEthernet0/0/0]mpls ldp
[R3-GigabitEthernet0/0/0]quit
[R3]interface GigabitEthernet 0/0/1
[R3-GigabitEthernet0/0/1]mpls
[R3-GigabitEthernet0/0/1]mpls ldp

4）R4配置

[R4]interface GigabitEthernet 0/0/0
[R4-GigabitEthernet0/0/0]ip address 34.1.1.4 8
[R4]interface LoopBack 0
[R4-LoopBack0]ip address 4.4.4.4 32

[R4]ospf 1 router-id 4.4.4.4
[R4-ospf-1]area 0
[R4-ospf-1-area-0.0.0.0]network 34.1.1.0 0.255.255.255
[R4-ospf-1-area-0.0.0.0]network 4.4.4.4 0.0.0.0

[R4]mpls lsr-id 4.4.4.4
[R4]mpls
[R4-mpls]quit
[R4]mpls ldp 
[R4-mpls-ldp]quit

[R4]interface GigabitEthernet 0/0/0
[R4-GigabitEthernet0/0/0]mpls
[R4-GigabitEthernet0/0/0]mpls ldp

5）查看LDP信息

<R1>display mpls ldp peer  
 LDP Peer Information in Public network
 A '*' before a peer means the peer is being deleted.
 PeerID                 TransportAddress   DiscoverySource
  2.2.2.2:0              2.2.2.2            GigabitEthernet0/0/0
 TOTAL: 1 Peer(s) Found.

<R1>display mpls ldp peer verbose  
 LDP Peer Information in Public network
 Peer LDP ID         : 2.2.2.2:0
 Peer Max PDU Length : 4096         Peer Transport Address : 2.2.2.2
 Peer Loop Detection : Off          Peer Path Vector Limit : ----
 Peer FT Flag        : Off          Peer Keepalive Timer   : 45 Sec
 Recovery Timer      : ----         Reconnect Timer        : ----
 Peer Type           : Local

 Peer Label Advertisement Mode : Downstream Unsolicited
 Peer Discovery Source         : GigabitEthernet0/0/0
 Peer Deletion Status          : No
 Capability-Announcement       : Off
 Peer P2MP Capability          : Off

<R1>display mpls ldp session 
LDP Session(s) in Public Network
 Codes: LAM(Label Advertisement Mode), SsnAge Unit(DDDD:HH:MM)
 A '*' before a session means the session is being deleted.
 PeerID             Status      LAM  SsnRole  SsnAge      KASent/Rcv
 2.2.2.2:0          Operational DU   Passive  0000:00:25  101/101
[R4]display mpls ldp lsp  
 LDP LSP Information
 DestAddress/Mask   In/OutLabel    UpstreamPeer    NextHop         OutInterface
 1.1.1.1/32         NULL/1024      -               34.1.1.3        GE0/0/0
 1.1.1.1/32         1024/1024      3.3.3.3         34.1.1.3        GE0/0/0
 2.2.2.2/32         NULL/1025      -               34.1.1.3        GE0/0/0
 2.2.2.2/32         1025/1025      3.3.3.3         34.1.1.3        GE0/0/0
 3.3.3.3/32         NULL/3         -               34.1.1.3        GE0/0/0
 3.3.3.3/32         1026/3         3.3.3.3         34.1.1.3        GE0/0/0
 4.4.4.4/32         3/NULL         3.3.3.3         127.0.0.1       InLoop0
*4.4.4.4/32         Liberal/1026                   DS/3.3.3.3
 TOTAL: 7 Normal LSP(s) Found.
 TOTAL: 1 Liberal LSP(s) Found.
 TOTAL: 0 Frr LSP(s) Found.
 A '*' before an LSP means the LSP is not established
 A '*' before a Label means the USCB or DSCB is stale
 A '*' before a UpstreamPeer means the session is stale
 A '*' before a DS means the session is stale
 A '*' before a NextHop means the LSP is FRR LSP

<R1>tracert lsp ip 4.4.4.4 32
LSP Trace Route FEC: IPV4 PREFIX 4.4.4.4/32 , press CTRL_C to break.
TTL   Replier            Time    Type      Downstream 
0                                Ingress   12.1.1.2/[1026 ]
1     12.1.1.2           20 ms   Transit   23.1.1.3/[1026 ]
2     23.1.1.3           40 ms   Transit   34.1.1.4/[3 ]
3     4.4.4.4            30 ms   Egress 

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