ospf环境下MBGP

配ip,缺省

r1

[r1-GigabitEthernet0/0/0]ip add 11.0.0.1 24

[r1-GigabitEthernet0/0/1]ip add 12.0.0.1 24

[r1-LoopBack0]ip add 192.168.1.1 24

[r1]ip route-static 0.0.0.0 0.0.0.0 11.0.0.11
[r1]ip route-static 0.0.0.0 0.0.0.0 12.0.0.12
 

r3

[r3-GigabitEthernet0/0/0]ip add 33.0.0.1 24
[r3-GigabitEthernet0/0/0]int l 0
[r3-LoopBack0]ip add 192.168.3.1 24

[r3]ip route-static 0.0.0.0 0.0.0.0 33.0.0.33

r4

[r4-GigabitEthernet0/0/0]ip add 44.0.0.1 24
[r4-LoopBack0]ip add 192.168.4.1 24

[r4]ip route-static 0.0.0.0 0.0.0.0 44.0.0.44

r5

[r5-GigabitEthernet0/0/0]ip add 55.0.0.1 24
[r5-LoopBack0]ip add 192.168.5.1 24

[r5]ip route-static 0.0.0.0 0.0.0.0 55.0.0.55

r6

[r6-GigabitEthernet0/0/0]ip add 66.0.0.1 24

[r6-LoopBack0]ip add 192.168.6.1 24

[r6]ip route-static 0.0.0.0 0.0.0.0 66.0.0.66

isp

[isp-GigabitEthernet0/0/0]ip add 11.0.0.2 24
[isp-GigabitEthernet0/0/0]ip add 12.0.0.2 24
[isp-GigabitEthernet0/0/0]int l 0
[isp-LoopBack0]ip add 2.2.2.2 24
[isp-GigabitEthernet0/0/2]ip add 33.0.0.2 24

[isp-GigabitEthernet4/0/0]ip add 44.0.0.2 24

[isp-GigabitEthernet4/0/1]ip add 55.0.0.2 24

[isp-GigabitEthernet4/0/2]ip add 66.0.0.2 24

R1-R3-R4构建全连的MGRE环境

[r1-Tunnel0/0/1]ip add 1.2.3.1 24
[r1-Tunnel0/0/1]tunnel-protocol gre p2mp
[r1-Tunnel0/0/1]source 12.0.0.1
[r1-Tunnel0/0/1]nhrp network-id 100
[r1-Tunnel0/0/1]nhrp entry 1.2.3.3 33.0.0.1 register
[r1-Tunnel0/0/1]nhrp entry 1.2.3.4 44.0.0.1 register
[r1-Tunnel0/0/1]nhrp entry multicast dynamic 
 

[r3-Tunnel0/0/1]ip add 1.2.3.3 24
[r3-Tunnel0/0/1] tunnel-protocol gre p2mp
[r3-Tunnel0/0/1]source 33.0.0.1
[r3-Tunnel0/0/1]nhrp entry multicast dynamic
[r3-Tunnel0/0/1]nhrp network-id 100
[r3-Tunnel0/0/1]nhrp entry 1.2.3.3 44.0.0.1 register

[r4-Tunnel0/0/1]ip add 1.2.3.4 24
[r4-Tunnel0/0/1]tunnel-protocol gre p2mp
[r4-Tunnel0/0/1]source 44.0.0.1
[r4-Tunnel0/0/1]nhrp entry multicast dynamic
[r4-Tunnel0/0/1]nhrp network-id 100

因为注册是双向的，r1和r3已经注册

R1-R5-R6建立hub-spoke的MGRE环境，其中R1为中心

[r1-Tunnel0/0/0]ip address 192.168.7.1 24  配ip
[r1-Tunnel0/0/0]tunnel-protocol gre p2mp   
[r1-Tunnel0/0/0]source 11.0.0.1 
[r1-Tunnel0/0/0]nhrp network-id 100          指定本网络的ID
[r1-Tunnel0/0/0]nhrp entry multicast dynamic  开伪广播

[r6-Tunnel0/0/0]ip add 192.168.7.6 24
[r6-Tunnel0/0/0]tunnel-protocol gre p2mp
[r6-Tunnel0/0/0]source 66.0.0.1
[r6-Tunnel0/0/0]nhrp network-id 100
[r6-Tunnel0/0/0] nhrp entry 192.168.7.1 11.0.0.1 register 找中心注册
 

[r5-Tunnel0/0/0]ip add 192.168.7.3 24
[r5-Tunnel0/0/0]tunnel-protocol gre p2mp
[r5-Tunnel0/0/0]source 55.0.0.1
[r5-Tunnel0/0/0]nhrp network-id 100
[r5-Tunnel0/0/0]nhrp entry 192.168.7.1 11.0.0.1 register

配置OSPF路由协议

[r1]ospf 1 router-id 1.1.1.1 
[r1-ospf-1]area 0.0.0.0 
[r1-ospf-1-area-0.0.0.0]network 192.168.1.0 0.0.0.255 
[r1-ospf-1-area-0.0.0.0]
[r1-ospf-1-area-0.0.0.0]network 192.168.7.0 0.0.0.255
[r1-ospf-1-area-0.0.0.0]network 1.2.3.0 0.0.0.255
[r1-Tunnel0/0/0]ospf network-type broadcast
[r1-Tunnel0/0/1]ospf network-type broadcast

[r3]ospf 1 router-id 3.3.3.3
[r3-ospf-1]area 0.0.0.0 
[r3-ospf-1-area-0.0.0.0]network 1.2.3.0 0.0.0.255
[r3-ospf-1-area-0.0.0.0]network 192.168.3.0 0.0.0.255
[r3-Tunnel0/0/1]ospf network-type broadcast
 

[r4]ospf 1 router-id 4.4.4.4 
[r4-ospf-1]area 0.0.0.0
[r4-ospf-1-area-0.0.0.0]network 192.168.4.0 0.0.0.255
[r4-ospf-1-area-0.0.0.0]network 1.2.3.0 0.0.0.255
[r4-Tunnel0/0/1]ospf network-type broadcast

[r5]ospf 1 router-id 5.5.5.5
[r5-ospf-1]area 0.0.0.0
[r5-ospf-1-area-0.0.0.0]network 192.168.5.0 0.0.0.255
[r5-ospf-1-area-0.0.0.0]network 192.168.7.0 0.0.0.255
[r5-Tunnel0/0/1]ospf network-type broadcast
 

[r6]ospf 1 router-id 6.6.6.6
[r6-ospf-1]area 0.0.0.0
[r6-ospf-1-area-0.0.0.0]network 192.168.6.0 0.0.0.255
[r6-ospf-1-area-0.0.0.0]network 192.168.7.0 0.0.0.255
[r6-Tunnel0/0/0]ospf network-type broadcast

修改优先级 放弃选举

[r5-Tunnel0/0/0]ospf dr-priority 0
[r6-Tunnel0/0/0]ospf dr-priority 0

r1r3r4之间互为分支和中心，会自动选择DR和BDR