第30章LDP协议

图片[1]-第30章LDP协议-大赛人网
图30-1 MPLS LDP配置网络拓扑

1.R1配置OSPF

[R1]ospf 1 router-id 1.1.1.1
[R1-ospf-1]area 0
[R1-ospf-1-area-0.0.0.0]network 1.1.1.1 0.0.0.0
[R1-ospf-1-area-0.0.0.0]network 12.1.1.0 0.255.255.255

2.R2配置OSPF

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

3.R3配置OSPF

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

4.R1配置MPLS和MPLS LDP

[R1]mpls lsr-id 1.1.1.1
[R1]mpls 
[R1]mpls ldp 

5.R2配置MPLS和MPLS LDP

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

6.R3配置MPLS和MPLS LDP

[R3]mpls lsr-id 3.3.3.3
[R3]mpls
[R3]mpls ldp

7.R1接口上使能MPLS和MPLS LDP

[R1]interface GigabitEthernet 0/0/0
[R1-GigabitEthernet0/0/0]mpls
[R1-GigabitEthernet0/0/0]mpls ldp

8.R2接口上使能MPLS和MPLS LDP

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

9.R3接口上使能MPLS和MPLS LDP

[R3]interface GigabitEthernet 0/0/1
[R3-GigabitEthernet0/0/1]mpls
[R3-GigabitEthernet0/0/1]mpls ldp

10.R1查看LDP全局信息

[R1]display mpls ldp 

                           LDP Global Information
  Protocol Version        : V1            Neighbor Liveness    : 600 Sec
 Graceful Restart        : Off           FT Reconnect Timer   : 0 Sec
 MTU Signaling           : On            Recovery Timer       : 300 Sec
 Capability-Announcement : Off           Longest-match        : Off
 P2MP Capability         : Off                                       

                          LDP Instance Information
 
 Instance ID             : 0             VPN-Instance         :
 Instance Status         : Active        LSR ID               : 1.1.1.1
 Loop Detection          : Off           Path Vector Limit    : 32
 Label Distribution Mode : Ordered       Label Retention Mode : Liberal
 Instance Deleting State : No            Instance Reseting State : No
 Graceful-Delete         : Off           Graceful-Delete Timer : 5 Sec

11.R1查看接口LDP信息

[R1]display mpls ldp interface 
 IFName          Status       LAM   TransportAddress     HelloSent/Rcv
GE0/0/0         Active       DU    1.1.1.1              53/43

12.R1查看LDP会话信息

[R1]display mpls ldp session
 2.2.2.2:0          Operational DU   Passive  0000:00:06  26/26

13.R2查看LDP邻居表

<R2>display mpls ldp peer 
 1.1.1.1:0              1.1.1.1            GigabitEthernet0/0/0
 3.3.3.3:0              3.3.3.3            GigabitEthernet0/0/1

14.R1连通性测试LSP

[R1]ping lsp ip 3.3.3.3 32
  LSP PING FEC: IPV4 PREFIX 3.3.3.3/32/ : 100  data bytes, press CTRL_C to break
    Reply from 3.3.3.3: bytes=100 Sequence=1 time=30 ms
    Reply from 3.3.3.3: bytes=100 Sequence=2 time=20 ms
    Reply from 3.3.3.3: bytes=100 Sequence=3 time=30 ms
    Reply from 3.3.3.3: bytes=100 Sequence=4 time=30 ms
    Reply from 3.3.3.3: bytes=100 Sequence=5 time=30 ms

14.R1跟踪测试LSP

[R1]tracert lsp ip 3.3.3.3 32
  LSP Trace Route FEC: IPV4 PREFIX 3.3.3.3/32 , press CTRL_C to break.
  TTL   Replier            Time    Type      Downstream 
  0                                Ingress   12.1.1.2/[1025 ]
  1     12.1.1.2           20 ms   Transit   23.1.1.3/[3 ]
  2     3.3.3.3            30 ms   Egress       

15.R1查看标签转发表

[R1]display mpls lsp include 3.3.3.3 32
FEC                In/Out Label  In/Out IF                      Vrf Name       
3.3.3.3/32         NULL/1025     -/GE0/0/0                                     
3.3.3.3/32         1025/1025     -/GE0/0/0           

16.R3配置邻居认证,查看LDP会话信息

[R3]mpls ldp
[R3-mpls-ldp]md5-password cipher 2.2.2.2 dsrw
[R3]display mpls ldp session 
2.2.2.2:0          NonExistent      Active               0/0
//状态为 NonExistent

17.R2配置邻居认证,R3查看LDP会话信息

[R2]mpls ldp
[R2-mpls-ldp]md5-password cipher 3.3.3.3 dsrw
 [R3]display mpls ldp session
2.2.2.2:0          Operational DU   Active   0000:00:00  1/1
//状态恢复为 Operational

18.R3配置LoopBack 1,并宣告到OSPF

[R3]interface LoopBack 1
[R3-LoopBack1]ip address 33.33.33.33 32
[R3]ospf 1 router-id 3.3.3.3
[R3-ospf-1]area 0
[R3-ospf-1-area-0.0.0.0]network 33.33.33.33 0.0.0.0

19.R1查看MPLS LSP

<R1>display mpls lsp 
1.1.1.1/32         3/NULL        -/-                                           
2.2.2.2/32         NULL/3        -/GE0/0/0                                     
2.2.2.2/32         1024/3        -/GE0/0/0                                     
3.3.3.3/32         NULL/1026     -/GE0/0/0                                     
3.3.3.3/32         1026/1026     -/GE0/0/0                                     
33.33.33.33/32     NULL/1027     -/GE0/0/0                                     
33.33.33.33/32     1027/1027     -/GE0/0/0     

20.R3配置ip-prefix策略,仅转发3.3.3.3/32路由的标签

[R3]ip ip-prefix dsrw permit 3.3.3.3 32
[R3]mpls ldp 
[R3-mpls-ldp]outbound peer 2.2.2.2 fec ip-prefix dsrw

21.R2查看标签转发表

[R2]display mpls lsp
1.1.1.1/32         NULL/3        -/GE0/0/0                                     
1.1.1.1/32         1024/3        -/GE0/0/0                                     
2.2.2.2/32         3/NULL        -/-                                           
3.3.3.3/32         NULL/3        -/GE0/0/1                                     
3.3.3.3/32         1026/3        -/GE0/0/1     

22.R2配置ip-prefix策略,拒绝3.3.3.3/32路由的标签

[R2]ip ip-prefix dsrw deny 3.3.3.3 32
[R2]mpls ldp
[R2-mpls-ldp]inbound peer 3.3.3.3 fec ip-prefix dsrw

 23.R2查看标签转发表

[R2]display mpls lsp
1.1.1.1/32         NULL/3        -/GE0/0/0                                     
1.1.1.1/32         1024/3        -/GE0/0/0                                     
2.2.2.2/32         3/NULL        -/- 

24.R1查看接口的MTU和MPLS MTU

<R1>display interface GigabitEthernet 0/0/0
Route Port,The Maximum Transmit Unit is 1500
<R1>display mpls interface GigabitEthernet 0/0/0
Interface             Status    TE Attr   LSP Count  CRLSP Count Effective MTU
GE0/0/0               Up        Dis       2          0           1500    

25.R1连通性测试R3,转包查看MTU

<R1>ping -s 1800 3.3.3.3 
  PING 3.3.3.3: 1800  data bytes, press CTRL_C to break
    Reply from 3.3.3.3: bytes=1800 Sequence=1 ttl=254 time=30 ms
    Reply from 3.3.3.3: bytes=1800 Sequence=2 ttl=254 time=40 ms
    Reply from 3.3.3.3: bytes=1800 Sequence=3 ttl=254 time=40 ms
    Reply from 3.3.3.3: bytes=1800 Sequence=4 ttl=254 time=50 ms
    Reply from 3.3.3.3: bytes=1800 Sequence=5 ttl=254 time=40 ms
图片[2]-第30章LDP协议-大赛人网
图30-2 抓包1
图片[3]-第30章LDP协议-大赛人网
图30-3 抓包2
图片[4]-第30章LDP协议-大赛人网
 图30-4 抓包3

26.R1连通性测试R3,设置Fbit不允许分片,包大小为1472

<R1>ping -f -s 1472 3.3.3.3
  PING 3.3.3.3: 1472  data bytes, press CTRL_C to break
    Reply from 3.3.3.3: bytes=1472 Sequence=1 ttl=254 time=20 ms
    Reply from 3.3.3.3: bytes=1472 Sequence=2 ttl=254 time=30 ms
    Reply from 3.3.3.3: bytes=1472 Sequence=3 ttl=254 time=20 ms
    Reply from 3.3.3.3: bytes=1472 Sequence=4 ttl=254 time=30 ms
    Reply from 3.3.3.3: bytes=1472 Sequence=5 ttl=254 time=30 ms

27.R1连通性测试R3,设置Fbit不允许分片,包大小为1473

<R1>ping -f -s 1473 3.3.3.3
  PING 3.3.3.3: 1473  data bytes, press CTRL_C to break
    Request time out
    Request time out
    Request time out
    Request time out
    Request time out
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