R2的配置:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 | ! interface Loopback0 ip address 2.2.2.2 255.255.255.0 ! interface Ethernet0/0 ip address 192.168.21.2 255.255.255.0 half-duplex ! interface Ethernet0/1 ip address 192.168.24.2 255.255.255.0 half-duplex ! interface Ethernet0/2 ip address 192.168.25.2 255.255.255.0 half-duplex ! interface Ethernet0/3 ip address 192.168.26.2 255.255.255.0 ip router isis half-duplex ! router eigrp 1 redistribute isis level-1-2 redistribute rip redistribute ospf 1 network 2.0.0.0 network 192.168.24.0 default-metric 1000 2500 255 1 1500 auto-summary ! router ospf 1 log-adjacency-changes redistribute isis level-1-2 subnets redistribute rip subnets redistribute eigrp 1 subnets network 2.2.2.0 0.0.0.255 area 0 network 192.168.25.0 0.0.0.255 area 0 distance ospf external 170 ! router isis net 49.0001.2222.2222.2222.00 redistribute rip redistribute eigrp 1 redistribute ospf 1 ! router rip version 2 redistribute isis level-1-2 redistribute eigrp 1 redistribute ospf 1 network 2.0.0.0 network 192.168.21.0 default-metric 4 distance 111 no auto-summary |
注:多边界多向路由重分布会有次优路由的问题,本路由器发出去的路由会被另一个协议重分发回来。如果AD值高的路由协议向AD值低的路由协议中重分发,就会产生次优路由,路由环路等问题。反之,AD值低的路由协议向AD值高的路由协议重分发,就不会发生这个问题。这个错误发生在边界路由器上,此时需要使用路由策略来解决,方法如下:
①、路由过滤:不让产生环路的路由条目进入我这台路由器,这样也就不会产生次优路径了。
②、修改管理距离AD:把次优路由条目的AD值调高,高到路由器即便看到两条路由条目去往同一目的地,也不会把次优路由写入路由表。这种方法比前一种好在如果最佳路径down了,次优路由变成备份路由使用。
R3的配置:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | ! interface Loopback0 ip address 3.3.3.3 255.255.255.0 ! interface Ethernet0/0 ip address 192.168.31.3 255.255.255.0 half-duplex ! interface Ethernet0/1 ip address 192.168.34.3 255.255.255.0 half-duplex ! interface Ethernet0/2 ip address 192.168.35.3 255.255.255.0 half-duplex ! interface Ethernet0/3 ip address 192.168.36.3 255.255.255.0 ip router isis half-duplex ! router eigrp 1 redistribute isis level-1-2 redistribute rip redistribute ospf 1 network 3.0.0.0 network 192.168.34.0 default-metric 1000 2500 255 1 1500 auto-summary ! router ospf 1 log-adjacency-changes redistribute isis level-1-2 subnets redistribute rip subnets redistribute eigrp 1 subnets network 3.3.3.0 0.0.0.255 area 0 network 192.168.35.0 0.0.0.255 area 0 distance ospf external 170 ! router isis net 49.0001.3333.3333.3333.00 redistribute rip redistribute eigrp 1 redistribute ospf 1 ! router rip version 2 redistribute isis level-1-2 redistribute eigrp 1 redistribute ospf 1 network 3.0.0.0 network 192.168.31.0 default-metric 4 distance 111 |
R1的配置:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | ! interface Loopback0 ip address 1.1.1.1 255.255.255.0 ! interface Ethernet0/0 ip address 192.168.21.1 255.255.255.0 half-duplex ! interface Ethernet0/1 ip address 192.168.31.1 255.255.255.0 half-duplex ! router rip version 2 network 1.0.0.0 network 192.168.21.0 network 192.168.31.0 no auto-summary |
R4的配置:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | ! interface Loopback0 ip address 4.4.4.4 255.255.255.0 ! interface Ethernet0/0 ip address 192.168.24.4 255.255.255.0 half-duplex ! interface Ethernet0/1 ip address 192.168.34.4 255.255.255.0 half-duplex ! router eigrp 1 network 4.0.0.0 network 192.168.24.0 network 192.168.34.0 auto-summary |
R5的配置:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | ! interface Loopback0 ip address 5.5.5.5 255.255.255.0 ! interface Ethernet0/0 ip address 192.168.25.5 255.255.255.0 half-duplex ! interface Ethernet0/1 ip address 192.168.35.5 255.255.255.0 half-duplex ! router ospf 1 log-adjacency-changes network 5.5.5.0 0.0.0.255 area 0 network 192.168.25.0 0.0.0.255 area 0 network 192.168.35.0 0.0.0.255 area 0 |
R6的配置:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | ! interface Loopback0 ip address 6.6.6.6 255.255.255.0 ip router isis ! interface Ethernet0/0 ip address 192.168.26.6 255.255.255.0 ip router isis half-duplex ! interface Ethernet0/1 ip address 192.168.36.6 255.255.255.0 ip router isis half-duplex ! router isis net 49.0001.6666.6666.6666.00 |