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全网除了R1与R3之间的通道之外,使用的是ospf互通。在R1与R3建立通道后,两边的loopback0和tunnel都起pim协议。两边都能看到pim邻居:
R1#sh ip pim neighbor
PIM Neighbor Table
Mode: B - Bidir Capable, DR - Designated Router, N - Default DR Priority,
S - State Refresh Capable
Neighbor Interface Uptime/Expires Ver DR
Address Prio/Mode
13.1.1.3 Tunnel13 00:14:51/00:01:39 v2 1 / S P
R3#sh ip pim neighbor
PIM Neighbor Table
Mode: B - Bidir Capable, DR - Designated Router, N - Default DR Priority,
S - State Refresh Capable
Neighbor Interface Uptime/Expires Ver DR
Address Prio/Mode
13.1.1.1 Tunnel13 00:15:12/00:01:18 v2 1 / S P
但是在R1和R3上使用各自的lo0作为C-RP,R1作为RP-mapping时,R3的RP-Announce消息就是不能通过tunnel发送过来,R1上选举出来的RP就是自己的lo0:
R1#sh ip pim rp mapping
PIM Group-to-RP Mappings
This system is an RP (Auto-RP)
This system is an RP-mapping agent (Loopback0)
Group(s) 224.0.0.0/4
RP 1.1.1.1 (?), v2v1
Info source: 1.1.1.1 (?), elected via Auto-RP
Uptime: 00:00:15, expires: 00:02:43
而R3没有任何RP消息,求解释~~~
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