组播auto-rp问题

a38154580

R1--R2之间是12.1.1.0/24 R1是12.1.1.1/24 R2是12.1.1.2/24

R2--R3之间是23.1.1.0/24 R3是.....

R1loopback 口是 1.1.1.1/24  R2loopback口是2.2.2.2/24 .......R5是5.5.5.5/24

拓扑图

R1 R2 R3 R4 R5 运行OSPF协议 R6模拟PC 将网关指向R5,R6加入组224.1.1.1

R1 在所有除R1 R6路由器接口dense 模式下可以ping通组224.1.1.1

后面sparse模式，自己指定RP ip pim rp-adress 3.3.3.3  也可以ping通组224.1.1.1

但是接下来的问题：


用auto-rp的时候R2 和 R5的接口loopback口作为候选RP

ip pim  send-rp-announce loopback 0 scope 8

在R3上作为MA (映射代理) --

ip  pim send-rp-discovery  loopback 0 scope 8

然后在查看R2的多播路由 ，也就是第一跳路由器上是否有RP信息，但是没有

rp是0.0.0.0

1. R2#sh ip mroute
   
2. IP Multicast Routing Table
   
3. Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
   
4. L - Local, P - Pruned, R - RP-bit set, F - Register flag,
   
5. T - SPT-bit set, J - Join SPT, M - MSDP created entry,
   
6. X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
   
7. U - URD, I - Received Source Specific Host Report, Z - Multicast Tunnel
   
8. Y - Joined MDT-data group, y - Sending to MDT-data group
   
9. Outgoing interface flags: H - Hardware switched
   
10. Timers: Uptime/Expires
    
11. Interface state: Interface, Next-Hop or VCD, State/Mode
    
12. 
    
13. (*, 224.0.1.39), 00:17:06/stopped, RP 0.0.0.0, flags: DP
    
14. Incoming interface: Null, RPF nbr 0.0.0.0
    
15. Outgoing interface list: Null
    
16. 
    
17. (2.2.2.2, 224.0.1.39), 00:16:38/00:02:22, flags: PT
    
18. Incoming interface: Loopback0, RPF nbr 0.0.0.0
    
19. Outgoing interface list: Null
    
20. 
    
21. (5.5.5.5, 224.0.1.39), 00:13:36/00:02:56, flags: PT
    
22. Incoming interface: Serial1/0, RPF nbr 23.1.1.3
    
23. Outgoing interface list: Null
    
24. 
    
25. (*, 224.0.1.40), 00:17:06/stopped, RP 0.0.0.0, flags: DCL
    
26. Incoming interface: Null, RPF nbr 0.0.0.0
    
27. Outgoing interface list:
    
28. Loopback0, Forward/Sparse-Dense, 00:17:06/00:00:00
    
29. 
    
30. (3.3.3.3, 224.0.1.40), 00:15:29/00:02:16, flags: LT
    
31. Incoming interface: Serial1/0, RPF nbr 23.1.1.3
    
32. Outgoing interface list:
    
33. Loopback0, Forward/Sparse-Dense, 00:15:29/00:00:00

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R3的路由表

1. 
   
2. R3#sh ip mroute
   
3. IP Multicast Routing Table
   
4. Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
   
5. L - Local, P - Pruned, R - RP-bit set, F - Register flag,
   
6. T - SPT-bit set, J - Join SPT, M - MSDP created entry,
   
7. X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
   
8. U - URD, I - Received Source Specific Host Report, Z - Multicast Tunnel
   
9. Y - Joined MDT-data group, y - Sending to MDT-data group
   
10. Outgoing interface flags: H - Hardware switched
    
11. Timers: Uptime/Expires
    
12. Interface state: Interface, Next-Hop or VCD, State/Mode
    
13. 
    
14. (*, 224.0.1.39), 00:14:48/stopped, RP 0.0.0.0, flags: DCL
    
15. Incoming interface: Null, RPF nbr 0.0.0.0
    
16. Outgoing interface list:
    
17. Loopback0, Forward/Sparse-Dense, 00:14:42/00:00:00
    
18. Serial1/1, Forward/Sparse, 00:14:42/00:02:05
    
19. Serial1/0, Forward/Sparse, 00:14:42/00:02:05
    
20. 
    
21. (2.2.2.2, 224.0.1.39), 00:14:49/00:02:09, flags: LT
    
22. Incoming interface: Serial1/0, RPF nbr 23.1.1.2
    
23. Outgoing interface list:
    
24. Loopback0, Forward/Sparse-Dense, 00:14:42/00:00:00
    
25. Serial1/1, Forward/Sparse, 00:14:42/00:02:04
    
26. 
    
27. (5.5.5.5, 224.0.1.39), 00:12:56/00:02:39, flags: LT
    
28. Incoming interface: Serial1/1, RPF nbr 35.1.1.5
    
29. Outgoing interface list:
    
30. Serial1/0, Forward/Sparse, 00:12:56/00:02:04
    
31. Loopback0, Forward/Sparse-Dense, 00:12:56/00:00:00
    
32. 
    
33. (*, 224.0.1.40), 00:14:56/stopped, RP 0.0.0.0, flags: DCL
    
34. Incoming interface: Null, RPF nbr 0.0.0.0
    
35. Outgoing interface list:
    
36. Loopback0, Forward/Sparse-Dense, 00:14:42/00:00:00
    
37. 
    
38. (3.3.3.3, 224.0.1.40), 00:14:41/00:02:55, flags: PLT
    
39. Incoming interface: Loopback0, RPF nbr 0.0.0.0
    
40. Outgoing interface list: Null

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(*,224.0.1.40)为何是stopped的，那样不是MA不能发送指定谁是RP的信息给路由器了吗。还有RP为何是0.0.0.0

然后在R1上ping 224.1.1.1

R1#ping 224.1.1.1
Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 224.1.1.1, timeout is 2 seconds:
Reply to request 0 from 56.1.1.6, 628 ms

又可以ping通 ，

头痛。。。。。

麻烦各位帮下手！  谢谢了！！！

qfswordman

用稀疏密集模式应是没有问题的，原因可能是先有鸡还是先有蛋。

se_541049166

楼主用的是那个IOS哦，做多播实验。

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