策略路由

策略路由：route-map来实现：（策略路由优于路由策略）
实验拓扑：
实验需求：企业内网分为192.168.100.0和192.168.200.0两个网络。实现192.168.100.0网段数据流通过ISP1进入互联网；现192.168.200.0数据流通过ISP3进入互联网。

实验代码如下：
R1:
enable
config t
hostname ISP1
int s1/1
ip add 192.168.12.1 255.255.255.0
no shutdown
exit
int fa0/0
ip add 192.168.123.1 255.255.255.0
no shutdown
exit
R2:
enable
config t
hostname qiye
int s1/0
ip add 192.168.12.2 255.255.255.0
no shutdown
exit
int s1/1
ip add 192.168.23.2 255.255.255.0
no shutdown
exit
int lo100
ip add 192.168.100.1 255.255.255.0
no shutdown
int lo100
ip add 192.168.200.1 255.255.255.0
no shutdown
exit
ip route 0.0.0.0 0.0.0.0 s1/0
ip route 0.0.0.0 0.0.0.0 s1/1
access-list 1 permit 192.168.100.0 0.0.0.255
access-list 2 permit 192.168.200.0 0.0.0.255
route-map xiaoxiao permit 10
match ip add 1
set default int s1/0
route-map xiaoxiao permit 20
match ip add 2
set default int s1/1
int lo100
ip policy route-map xiaoxiao
exit
int lo200
ip policy route-map xiaoxiao
end
R3:
enable
config t
hostname ISP3
int s1/0
ip add 192.168.23.3 255.255.255.0
no shutdown
exit
int fa0/0
ip add 192.168.123.3 255.255.255.0
no shutdown
end
实验现象：