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[ 本帖最后由 jiazeyao 于 2011-4-23 17:06 编辑 ]
en
conf t
no ip do lo
line con 0
exec-t 0
logg sy
ho R //在各个路由器上标上标号
基本配置：
R1>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
int s1/0
Ip add 192.168.12.1 255.255.255.0
no shu
int s1/1
ip add 192.168.13.1 255.255.255.0
no shu
int lo 0
ip add 1.1.1.1 255.255.255.255
R2:>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
int s1/0
ip add 192.168.12.2 255.255.255.0
no shu
int f0/0
ip add 192.1.1.2 255.255.255.0
no shu
R3:>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
int s1/1
ip add 192.168.13.3 255.255.255.0
no shu
int f0/0
ip add 192.1.1.3 255.255.255.0
no shu
R5:>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
int lo0
ip add 5.5.5.5 255.255.255.0
int f0/0
ip add 192.1.1.5 255.255.255.0
no shu
&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
要求：R5和R1的loopback口通过重宣告直连引进路由协议。R2和R3做双点双向重宣告，最终R5到1.1.1.1 以及R1到5.5.5.5都可以负载均衡。
通过两种方法实现：
方法一、修改协议管理距离
方法二、不修改管理距离通过路由过滤实现。
&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
R1上重宣告直连
router ospf 1
log-adjacency-changes
redistribute connected subnets
network 192.168.12.0 0.0.0.255 area 0
network 192.168.13.0 0.0.0.255 area 0
R5上重宣告直连
router eigrp 1
redistribute connected
network 192.1.1.0
no auto-summary
R2；
router os 1
net 192.168.12.0 0.0.0.255 a 0
re eig 1 su
router eig 1
net 192.1.1.0
re os 1 me 10000 100 255 1 1500
R3；
router os 1
net 192.168.13.0 0.0.0.255 a 0
re eig 1 su
router eig 1
net 192.1.1.0
re os 1 me 10000 100 255 1 1500
刚配置完双点双向重发布时R1\R5上的show ip route分别为：
C 192.168.12.0/24 is directly connected, Serial1/0
1.0.0.0/32 is subnetted, 1 subnets
C 1.1.1.1 is directly connected, Loopback0
C 192.168.13.0/24 is directly connected, Serial1/1
5.0.0.0/24 is subnetted, 1 subnets
O E2 5.5.5.0 [110/20] via 192.168.12.2, 00:01:03, Serial1/0
O E2 192.1.1.0/24 [110/20] via 192.168.12.2, 00:01:03, Serial1/0
[110/20] via 192.168.13.3, 00:01:03, Serial1/1
---------------------------------------------------------------------
D EX 192.168.12.0/24 [170/284160] via 192.1.1.3, 00:00:10, FastEthernet0/0
[170/284160] via 192.1.1.2, 00:00:10, FastEthernet0/0
1.0.0.0/32 is subnetted, 1 subnets
D EX 1.1.1.1 [170/284160] via 192.1.1.3, 00:00:10, FastEthernet0/0
[170/284160] via 192.1.1.2, 00:00:10, FastEthernet0/0
D EX 192.168.13.0/24 [170/284160] via 192.1.1.3, 00:00:10, FastEthernet0/0
[170/284160] via 192.1.1.2, 00:00:10, FastEthernet0/0
5.0.0.0/24 is subnetted, 1 subnets
C 5.5.5.0 is directly connected, Loopback0
C 192.1.1.0/24 is directly connected, FastEthernet0/0
方法一：修改协议管理距离。
在R2上配置：
router eigrp 1
redistribute ospf 1 metric 10000 100 255 1 1500
network 192.1.1.0
no auto-summary
router ospf 1
log-adjacency-changes
redistribute eigrp 1 subnets
network 192.168.12.0 0.0.0.255 area 0
distance 180 0.0.0.0 255.255.255.255 1
access-list 1 permit 5.5.5.0 0.0.0.255
在R3上配置：
router eigrp 1
redistribute ospf 1 metric 10000 100 255 1 1500
network 192.1.1.0
no auto-summary
router ospf 1
log-adjacency-changes
redistribute eigrp 1 subnets
network 192.168.13.0 0.0.0.255 area 0
distance 180 0.0.0.0 255.255.255.255 1
access-list 1 permit 5.5.5.0 0.0.0.255
配置后R1\R5上的show ip route为： //实现了1.1.1.1和5.5.5.5双向的负载均衡
C 192.168.12.0/24 is directly connected, Serial1/0
1.0.0.0/32 is subnetted, 1 subnets
C 1.1.1.1 is directly connected, Loopback0
C 192.168.13.0/24 is directly connected, Serial1/1
5.0.0.0/24 is subnetted, 1 subnets
O E2 5.5.5.0 [110/20] via 192.168.12.2, 00:00:05, Serial1/0
[110/20] via 192.168.13.3, 00:00:05, Serial1/1
O E2 192.1.1.0/24 [110/20] via 192.168.12.2, 00:00:05, Serial1/0
[110/20] via 192.168.13.3, 00:00:05, Serial1/1
-----------------------------------------------------------------
D EX 192.168.12.0/24 [170/284160] via 192.1.1.3, 00:00:02, FastEthernet0/0
[170/284160] via 192.1.1.2, 00:00:02, FastEthernet0/0
1.0.0.0/32 is subnetted, 1 subnets
D EX 1.1.1.1 [170/284160] via 192.1.1.3, 00:00:02, FastEthernet0/0
[170/284160] via 192.1.1.2, 00:00:02, FastEthernet0/0
D EX 192.168.13.0/24 [170/284160] via 192.1.1.2, 00:00:02, FastEthernet0/0
[170/284160] via 192.1.1.3, 00:00:02, FastEthernet0/0
5.0.0.0/24 is subnetted, 1 subnets
C 5.5.5.0 is directly connected, Loopback0
C 192.1.1.0/24 is directly connected, FastEthernet0/0
方法二：使用路由过滤（分发列表）
将之前改动过的AD值no掉。
在R2上：
router ospf 1
log-adjacency-changes
redistribute eigrp 1 subnets
network 192.168.12.0 0.0.0.255 area 0
distribute-list 1 in Serial1/0
!
!
access-list 1 deny 5.5.5.0 0.0.0.255
access-list 1 permit any
在R3上：
router ospf 1
log-adjacency-changes
redistribute eigrp 1 subnets
network 192.168.12.0 0.0.0.255 area 0
distribute-list 1 in Serial1/0
!
!
access-list 1 deny 5.5.5.0 0.0.0.255
access-list 1 permit any
之后在R1\R5上show ip route有
R1：
C 192.168.12.0/24 is directly connected, Serial1/0
1.0.0.0/32 is subnetted, 1 subnets
C 1.1.1.1 is directly connected, Loopback0
C 192.168.13.0/24 is directly connected, Serial1/1
5.0.0.0/24 is subnetted, 1 subnets
O E2 5.5.5.0 [110/20] via 192.168.13.3, 00:00:36, Serial1/1
[110/20] via 192.168.12.2, 00:00:36, Serial1/0 //实现了负载均衡
O E2 192.1.1.0/24 [110/20] via 192.168.13.3, 00:24:40, Serial1/1
[110/20] via 192.168.12.2, 00:24:40, Serial1/0
R5：
D EX 192.168.12.0/24 [170/284160] via 192.1.1.2, 00:00:15, FastEthernet0/0
[170/284160] via 192.1.1.3, 00:00:15, FastEthernet0/0
1.0.0.0/32 is subnetted, 1 subnets
D EX 1.1.1.1 [170/284160] via 192.1.1.2, 00:00:15, FastEthernet0/0
[170/284160] via 192.1.1.3, 00:00:15, FastEthernet0/0
D EX 192.168.13.0/24 [170/284160] via 192.1.1.3, 00:00:28, FastEthernet0/0
[170/284160] via 192.1.1.2, 00:00:28, FastEthernet0/0
5.0.0.0/24 is subnetted, 1 subnets
C 5.5.5.0 is directly connected, Loopback0
C 192.1.1.0/24 is directly connected, FastEthernet0/0
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