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EIGRP和OSPF做双点双向重分发

2015-06-17

EIGRP和OSPF做双点双向重分发
 
第一种情况：
 
1，R1,R2,R3,R4初始配置
 
R1
 
conf t
 
int l 0
 
ip add 1.1.1.1 255.255.255.255
 
int f0/0
 
ip add 1.1.123.1 255.255.255.0
 
no shut
 
router eigrp 1
 
no auto
 
net 1.1.1.1 0.0.0.0
 
net 1.1.123.0 0.0.0.255
 
end
 
R2
 
conf t
 
int l 0
 
ip add 1.1.2.2 255.255.255.255
 
int f0/0
 
ip add 1.1.123.2 255.255.255.0
 
no shut
 
int s1/0
 
ip add 1.1.234.2 255.255.255.0
 
encap f
 
no arp f
 
no frame inv
 
frame map ip 1.1.234.4 204 b
 
frame map ip 1.1.234.3 204 b
 
no shut
 
ip ospf p 0
 
router ospf 1
 
router-id 1.1.2.2
 
net 1.1.234.2 0.0.0.0 a 0
 
net 1.1.2.2 0.0.0.0 a 0
 
router eigrp 1
 
no auto
 
net 1.1.2.2 0.0.0.0
 
net 1.1.123.0 0.0.0.255
 
end
 
R3
 
conf t
 
int l 0
 
ip add 1.1.3.3 255.255.255.255
 
int f 0/0
 
ip add 1.1.123.3 255.255.255.0
 
no shut
 
int s1/0
 
ip add 1.1.234.3 255.255.255.0
 
encap f
 
no arp f
 
no frame inv
 
frame map ip 1.1.234.4 304 b
 
frame map ip 1.1.234.2 304 b
 
no shut
 
ip ospf p 0
 
router ospf 1
 
router-id 1.1.3.3
 
net 1.1.234.3 0.0.0.0 a 0
 
net 1.1.3.3 0.0.0.0 a 0
 
router eigrp 1
 
no auto
 
net 1.1.3.3 0.0.0.0
 
net 1.1.123.0 0.0.0.255
 
end
 
R4
 
conf t
 
int l 0
 
ip add 1.1.4.4 255.255.255.255
 
int s1/0
 
ip add 1.1.234.4 255.255.255.0
 
encap f
 
no arp f
 
no frame inv
 
frame map ip 1.1.234.2 402 b
 
frame map ip 1.1.234.3 403 b
 
no shut
 
router ospf 1
 
router-id 1.1.4.4
 
nei 1.1.234.2
 
nei 1.1.234.3
 
net 1.1.234.4 0.0.0.0 a 0
 
net 1.1.4.4 0.0.0.0 a 0
 
end
 
到这里，所有的EIGRP和OSPF邻居关系都建立好了。
 
2，在R2和R3上做双点双向重分发
 
R2
 
router eigrp 1
 
redistribute ospf 1 metric 10000 100 255 1 1500
 
router ospf 1
 
redistribute eigrp 1 metric 100 metric-type 1 subnets
 
end
 
R3
 
router eigrp 1
 
redistribute ospf 1 metric 10000 100 255 1 1500
 
router ospf 1
 
redistribute eigrp 1 metric 100 metric-type 1 subnets
 
end
 
重分发完成，
 
验证
 
R1路由表
 
R1#sh ip route
 
Gateway of last resort is not set
 
1.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
 
D EX 1.1.4.4/32 [170/284160] via 1.1.123.3, 00:01:03, FastEthernet0/0
 
[170/284160] via 1.1.123.2, 00:01:03, FastEthernet0/0
 
D 1.1.3.3/32 [90/156160] via 1.1.123.3, 00:08:44, FastEthernet0/0
 
D 1.1.2.2/32 [90/156160] via 1.1.123.2, 00:08:44, FastEthernet0/0
 
C 1.1.1.1/32 is directly connected, Loopback0
 
C 1.1.123.0/24 is directly connected, FastEthernet0/0
 
D EX 1.1.234.0/24 [170/284160] via 1.1.123.3, 00:02:51, FastEthernet0/0
 
[170/284160] via 1.1.123.2, 00:02:51, FastEthernet0/0
 
R4路由表
 
R4#sh ip route
 
Gateway of last resort is not set
 
1.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
 
C 1.1.4.4/32 is directly connected, Loopback0
 
O 1.1.3.3/32 [110/65] via 1.1.234.3, 00:00:14, Serial1/0
 
O 1.1.2.2/32 [110/65] via 1.1.234.2, 00:00:14, Serial1/0
 
O E1 1.1.1.1/32 [110/164] via 1.1.234.3, 00:00:14, Serial1/0
 
[110/164] via 1.1.234.2, 00:00:14, Serial1/0
 
O E1 1.1.123.0/24 [110/164] via 1.1.234.3, 00:00:14, Serial1/0
 
[110/164] via 1.1.234.2, 00:00:14, Serial1/0
 
C 1.1.234.0/24 is directly connected, Serial1/0
 
第二种情况
 
在R1的S1/2接口接入R5，并启用RIPV2
 
R5
 
conf t
 
int s1/2
 
ip add 192.168.45.5 255.255.255.0
 
no shut
 
router rip
 
ver 2
 
no auto
 
net 192.168.45.0
 
end
 
R1
 
conf t
 
int s1/2
 
no shut
 
ip add 192.168.45.4 255.255.255.0
 
router rip
 
ver 2
 
no au
 
net 192.168.45.0
 
end
 
 
把RIP再分发到EIGRP1中
 
router eigrp 1
 
redistribute rip metric 10000 100 255 1 1500
 
end
 
这时看R2和R3上的路由表
 
R2(config)#do sh ip route
 
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
 
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
 
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
 
E1 - OSPF external type 1, E2 - OSPF external type 2
 
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
 
ia - IS-IS inter area, * - candidate default, U - per-user static route
 
o - ODR, P - periodic downloaded static route
 
Gateway of last resort is not set
 
1.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
 
O 1.1.4.4/32 [110/65] via 1.1.234.4, 00:31:58, Serial1/0
 
D 1.1.3.3/32 [90/156160] via 1.1.123.3, 00:05:56, FastEthernet0/0
 
C 1.1.2.2/32 is directly connected, Loopback0
 
D 1.1.1.1/32 [90/156160] via 1.1.123.1, 00:05:56, FastEthernet0/0
 
C 1.1.123.0/24 is directly connected, FastEthernet0/0
 
C 1.1.234.0/24 is directly connected, Serial1/0
 
O E1 192.168.45.0/24 [110/164] via 1.1.234.3, 00:05:59, Serial1/0
 
R2(config)#do ping 192.168.45.5
 
Type escape sequence to abort.
 
Sending 5, 100-byte ICMP Echos to 192.168.45.5, timeout is 2 seconds:
 
.....
 
Success rate is 0 percent (0/5)
 
仔细查看路由表可以发现，R2到192.168.45.0网段下一跳是1.1.234.2，也就是R3的S1/0接口，但是拓扑上表明下一跳为R1的F0 /0接口为最佳路径。为什么会出现这样的情况呢？
 
我们知道，EIGRP的AD(管理距离）有两种情况：
 
1，当收到内部路由时，AD为90，路由表里的标识为“D”
 
2，当收到外部转发的路由是，AD为170，路由表里的标识为“ D EX”
 
当R1把RIP再分发到EIGRP1中的时候，R2和R3的收到192.168.45.0网段为“D EX"标识（可以通过shou ip bgptop命令校验)，这时EIGRP的AD为170，当R2把EIGRP1再分发到OSPF中后，因为的OSPF的AD为110，R3会从R1和R2 这个两个路由器上收到192.168.45.0这个路由条目，根据路由选路原则，R3会优先选择OSPF协议收到的路由，所以在路由表上显示“OE1”， 这样的结果会造成数据包在R4和R2之间震荡，
 
用trace命令验证
 
R2(config)#do trace 192.168.45.5
 
Type escape sequence to abort.
 
Tracing the route to 192.168.45.5
 
1 1.1.234.4 252 msec 232 msec 232 msec
 
2 1.1.234.3 432 msec 308 msec 304 msec
 
3 * * *
 
4 1.1.234.4 576 msec 612 msec 480 msec
 
5 1.1.234.3 720 msec 464 msec 648 msec
 
6 * * *
 
7 1.1.234.4 528 msec 684 msec 552 msec
 
8 1.1.234.3 888 msec 932 msec 672 msec
 
9 * * *
 
……
 
R3上也会出现相同的情况
 
解决方法
 
将R2和R3上OSPF的AD修改为大于170
 
R2
 
conf t
 
access 10 permit 192.168.45.0 0.0.0.255
 
router ospf 1
 
distance 180 1.1.3.3 0.0.0.0 10
 
end
 
R3
 
conf t
 
access 10 permit 192.168.45.0 0.0.0.255
 
router ospf 1
 
distance 180 1.1.2.2 0.0.0.0 10
 
end
 
验证R2，R3，R4路由表
 
R2(config)#do sh ip route
 
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
 
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
 
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
 
E1 - OSPF external type 1, E2 - OSPF external type 2
 
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
 
ia - IS-IS inter area, * - candidate default, U - per-user static route
 
o - ODR, P - periodic downloaded static route
 
Gateway of last resort is not set
 
1.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
 
O 1.1.4.4/32 [110/65] via 1.1.234.4, 00:11:38, Serial1/0
 
D 1.1.3.3/32 [90/156160] via 1.1.123.3, 00:11:38, FastEthernet0/0
 
C 1.1.2.2/32 is directly connected, Loopback0
 
D 1.1.1.1/32 [90/156160] via 1.1.123.1, 00:11:38, FastEthernet0/0
 
C 1.1.123.0/24 is directly connected, FastEthernet0/0
 
C 1.1.234.0/24 is directly connected, Serial1/0
 
D EX 192.168.45.0/24 [170/284160] via 1.1.123.1, 00:11:38, FastEthernet0/0
 
R3(config)#do sh ip route
 
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
 
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
 
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
 
E1 - OSPF external type 1, E2 - OSPF external type 2
 
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
 
ia - IS-IS inter area, * - candidate default, U - per-user static route
 
o - ODR, P - periodic downloaded static route
 
Gateway of last resort is not set
 
1.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
 
O 1.1.4.4/32 [110/65] via 1.1.234.4, 00:01:27, Serial1/0
 
C 1.1.3.3/32 is directly connected, Loopback0
 
D 1.1.2.2/32 [90/156160] via 1.1.123.2, 00:01:27, FastEthernet0/0
 
D 1.1.1.1/32 [90/156160] via 1.1.123.1, 00:01:27, FastEthernet0/0
 
C 1.1.123.0/24 is directly connected, FastEthernet0/0
 
C 1.1.234.0/24 is directly connected, Serial1/0
 
D EX 192.168.45.0/24 [170/284160] via 1.1.123.1, 00:01:27, FastEthernet0/0
 
R4#sh ip route
 
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
 
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
 
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
 
E1 - OSPF external type 1, E2 - OSPF external type 2
 
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
 
ia - IS-IS inter area, * - candidate default, U - per-user static route
 
o - ODR, P - periodic downloaded static route
 
Gateway of last resort is not set
 
1.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
 
C 1.1.4.4/32 is directly connected, Loopback0
 
O 1.1.3.3/32 [110/65] via 1.1.234.3, 00:19:57, Serial1/0
 
O 1.1.2.2/32 [110/65] via 1.1.234.2, 00:19:57, Serial1/0
 
O E1 1.1.1.1/32 [110/164] via 1.1.234.3, 00:19:57, Serial1/0
 
[110/164] via 1.1.234.2, 00:19:57, Serial1/0
 
O E1 1.1.123.0/24 [110/164] via 1.1.234.3, 00:19:57, Serial1/0
 
[110/164] via 1.1.234.2, 00:19:57, Serial1/0
 
C 1.1.234.0/24 is directly connected, Serial1/0
 
O E1 192.168.45.0/24 [110/164] via 1.1.234.3, 00:12:25, Serial1/0
 
[110/164] via 1.1.234.2, 00:12:25, Serial1/0
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