一、 根据要求建立拓扑(如图)
二、子网划分,分配IP地址
根据要求使用OSPF应采用区域划分网段,先划分6个区域,然后将6个区域的网段按照各自区域情况来分配IP地址,从而更方便后期汇总。
172.16.0.0/16
借3位可以划分8个网段取6个来分配给6个区域:
172.16.0.0/19 (区域0)
172.16.0.0/25 p2p 骨干
172.16.0.0/30
172.16.0.4/30
.....................
172.16.0.128/25 MA 骨干
172.16.0.128/29
172.16.0.136/29
....................
172.16.32.0/19 (区域1)
172.16.32.0/25 P2P
172.16.32.128/25 MA
172.16.64.0/19(区域2)
172.16.64.0/25 P2P
172.16.64.128/25 MA
172.16.96.0/19(区域3)
172.16.96.0/25 P2P
172.16.96.128/25 MA
172.16.128.0/19(区域4)
172.16.128.0/25 PAP
172.16.128.128/25 MA
172.16.160.0/19(RIP)
172.16.160.0/20
172.16.176.0/20
三、搭建MGRE环境
1.配置缺省
[R3]ip route-static 0.0.0.0 0 34.1.1.2
[R5]ip route-static 0.0.0.0 0 45.1.1.2
[R6]ip route-static 0.0.0.0 0 46.1.1.2
[R7]ip route-static 0.0.0.0 0 47.1.1.2
2.在R3,R5,R6,R7上创建tunnel口,以R3为中心站点,配置tunnel。
[R3]interface Tunnel 0/0/0
[R3-Tunnel0/0/0]ip address 172.16.0.129 29
[R3-Tunnel0/0/0]tunnel-protocol gre p2mp
[R3-Tunnel0/0/0]source 34.1.1.1
[R3-Tunnel0/0/0]nhrp entry multicast dynamic
[R3-Tunnel0/0/0]nhrp entry net
[R3-Tunnel0/0/0]nhrp network-id 100
[R5]interface Tunnel 0/0/0
[R5-Tunnel0/0/0]ip add 172.16.0.130 29
[R5-Tunnel0/0/0]tunnel-protocol gre p2mp
[R5-Tunnel0/0/0]source 45.1.1.1
[R5-Tunnel0/0/0]nhrp entry 172.16.0.129 34.1.1.1 register
[R5-Tunnel0/0/0]nhrp network-id 100
[R6]interface Tunnel 0/0/0
[R6-Tunnel0/0/0]ip add 172.16.0.131 29
[R6-Tunnel0/0/0]tunnel-protocol gre p2mp
[R6-Tunnel0/0/0]source 46.1.1.1
[R6-Tunnel0/0/0]nhrp entry 172.16.0.129 34.1.1.1 register
[R6-Tunnel0/0/0]nhrp network-id 100
[R7]interface Tunnel 0/0/0
[R7-Tunnel0/0/0]ip add 172.16.0.132 29
[R7-Tunnel0/0/0]tunnel-protocol gre p2mp
[R7-Tunnel0/0/0]source 47.1.1.1
[R7-Tunnel0/0/0]nhrp entry 172.16.0.129 34.1.1.1 register
[R7-Tunnel0/0/0]nhrp network-id 100
3.测试。
四、 配置OSPF
每个区域内分别配置ospf将接口宣告进相应的区域:
[R1]ospf 1 router-id 1.1.1.1
[R1-ospf-1]area 1
[R1-ospf-1-area-0.0.0.1]network 172.16.0.0 0.0.255.255
[R2]ospf 1 router-id 2.2.2.2
[R2-ospf-1]area 1
[R2-ospf-1-area-0.0.0.1]net
[R2-ospf-1-area-0.0.0.1]network 172.16.0.0 0.0.255.255
[R3]ospf 1 router-id 3.3.3.3
[R3-ospf-1]area 1
[R3-ospf-1-area-0.0.0.1]network 172.16.32.0 0.0.3.255
[R3-ospf-1]area 0
[R3-ospf-1-area-0.0.0.0]network 172.16.0.129 0.0.0.0
[R5]ospf 1 router-id 5.5.5.5
[R5-ospf-1]area 0
[R5-ospf-1-area-0.0.0.0]network 172.16.0.0 0.0.255.255
[R6]ospf 1 router-id 6.6.6.6
[R6-ospf-1]area 0
[R6-ospf-1-area-0.0.0.0]network 172.16.0.0 0.0.1.255
[R6-ospf-1]area 2
[R6-ospf-1-area-0.0.0.2]network 172.16.64.1 0.0.0.0
[R7]ospf 1 router-id 7.7.7.7
[R7-ospf-1]ar
[R7-ospf-1]area 0
[R7-ospf-1-area-0.0.0.0]network 172.16.0.0 0.0.3.255
[R7-ospf-1]area 3
[R7-ospf-1-area-0.0.0.3]net
[R7-ospf-1-area-0.0.0.3]network 172.16.96.1 0.0.0.0
[R8]ospf 1 router-id 8.8.8.8
[R8-ospf-1]area 3
[R8-ospf-1-area-0.0.0.3]network 172.16.0.0 0.0.255.255
[R9]ospf 1 router-id 9.9.9.9
[R9-ospf-1]area 3
[R9-ospf-1-area-0.0.0.3]network 172.16.96.6 0.0.0.0
[R9-ospf-1]area 4
[R9-ospf-1-area-0.0.0.4]network 172.16.128.0 0.0.1.255
[R10]ospf 1 router-id 10.10.10.10
[R10-ospf-1]area 4
[R10-ospf-1-area-0.0.0.4]network 172.16.0.0 0.0.255.255
[R11]ospf 1 router-id 11.11.11.11
[R11-ospf-1]area 2
[R11-ospf-1-area-0.0.0.2]network 172.16.0.0 0.0.255.255
[R12]ospf 1 router-id 12.12.12.12
[R12-ospf-1]area 2
[R12-ospf-1-area-0.0.0.2]network 172.16.64.6 0.0.0.0
[R12]rip 1
[R12-rip-1]ver 2
[R12-rip-1]network 172.16.0.0
五、解决区域0的邻居关系问题
1.将区域0的R5,R6,R7修改为 BROADCAST:
[R5-Tunnel0/0/0]ospf network-type broadcast
[R6-Tunnel0/0/0]ospf network-type broadcast
[R7-Tunnel0/0/0]ospf network-type broadcast
2.R5,R6,R7放弃参选,修改优先级为0:
[R5-Tunnel0/0/0]ospf dr-priority 0
[R6-Tunnel0/0/0]ospf dr-priority 0
[R7-Tunnel0/0/0]ospf dr-priority 0
六、解决区域4,EIGRP 与整个OSPF域通信问题
1.R12上进入ospf,后进行重发布
[R12-ospf-1]import-route rip 1
2.R9进行多进程双向重发布
[R9-ospf-1]import-route ospf 2
七、减少LSA的更新量
1.在R3,R6,R7上将域间路由汇总,在R9,R12上进行域外路由汇总 。
[R3-ospf-1-area-0.0.0.1]abr-summary 172.16.32.0 255.255.224.0
[R6-ospf-1-area-0.0.0.2]abr-summary 172.16.64.0 255.255.224.0
[R7-ospf-1-area-0.0.0.3]abr-summary 172.16.96.0 255.255.224.0
[R12-ospf-1]asbr-summary 172.16.160.0 255.255.224.0
[R9-ospf-1]asbr-summary 172.16.128.0 255.255.224.0
2.将其他区域改为特殊区域
将区域1改为完全末梢区域
[R1-ospf-1-area-0.0.0.1]stub
[R2-ospf-1-area-0.0.0.1]stub
[R3-ospf-1-area-0.0.0.1]stub no-summary
将区域2,区域3改为完全NSSA
[R12-ospf-1-area-0.0.0.2]nssa
[R11-ospf-1-area-0.0.0.2]nssa
[R6-ospf-1-area-0.0.0.2]nssa no-summary
[R7-ospf-1-area-0.0.0.3]nssa no-summary
[R8-ospf-1-area-0.0.0.3]nssa
[R9-ospf-1-area-0.0.0.3]nssa
3.补全R10缺省
[R9-ospf-2]default-route-advertise
八.NAT转换
[R3]acl 2000
[R3-acl-basic-2000]rule permit source 172.16.0.0 0.0.255.255
[R3-GigabitEthernet0/0/1]nat outbound 2000
[R6-acl-basic-2000]rule permit source 172.16.0.0 0.0.255.255
[R6-GigabitEthernet0/0/0]nat outbound 2000
[R7-acl-basic-2000]rule permit source 172.16.0.0 0.0.255.255
[R7-GigabitEthernet0/0/0]nat outbound 2000
测试访问R4的回环
九、空接口防环
[R3]ip route-static 172.16.32.0 19 NULL 0
[R6]ip route-static 172.16.64.0 19 NULL 0
[R7]ip route-static 172.16.96.0 19 NULL 0
[R9]ip route-static 172.16.128.0 19 NULL 0
[R12]ip route-static 172.16.160.0 19 NULL 0
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