电信联通双线路接入

 最近客户新加了条电信的线路(之前是使用联通的)，需要做双线路负载均衡，访问联通网站时走联通线路，默认时走电信线路。在这里随便复习一下在cisco路由器上实现该功能，如下图：

Eg：

 

拓扑描述：R3是公司路由器F0/1接内网，NAT内部地址上外网；R1,R4模拟电信外部网络；R2，R5模拟联通外部网络。

 

R3接口基本配置：

interface FastEthernet0/1

 ip address 192.168.1.1 255.255.255.0

 description R1 LAN

 ip nat inside

 

interface FastEthernet1/1

 ip address 21.21.21.1 255.255.255.0

 description R1---->ISP1

 ip nat outside

 

interface FastEthernet1/0

 ip address 12.12.12.1 255.255.255.0

 description R1---->ISP1

 ip nat outside

======================================

R1接口配置：

interface FastEthernet1/0

 ip address 12.12.12.2 255.255.255.0

 

interface FastEthernet1/1

 ip address 14.14.14.1 255.255.255.0

=======================================

R2接口配置：

interface FastEthernet1/0

 ip address 21.21.21.2 255.255.255.0

 

interface FastEthernet1/1

 ip address 25.25.25.1 255.255.255.0

========================================

1.配置NAT列表：

access-list 100 permit ip 192.168.1.0 0.0.0.255 any

 

 

2. 配置动态地址池：

ip nat pool isp1 12.12.12.1 12.12.12.1 netmask 255.255.255.0

ip nat pool isp2 21.21.21.1 21.21.21.1 netmask 255.255.255.0

3. 配置路由策略 ：

route-map isp2 permit 1

  match ip address 100

 match interface FastEthernet1/0

 

route-map isp1 permit 1

 match ip address 100

 match interface FastEthernet1/1

 

4.配置IP SLA：

ip sla 1

 icmp-echo 12.12.12.2 source-ip 12.12.12.1

 frequency 20

ip sla schedule 1 life forever start-time now

 

ip sla 2

 icmp-echo 21.21.21.2 source-ip 21.21.21.1

 frequency 20

ip sla schedule 2 life forever start-time now

 

track 10 ip sla 1 reachability

track 20 ip sla 2 reachability

 

5. 映射NAT列表：

   ip nat inside source route-map isp1 pool isp1 overload

ip nat inside source route-map isp2 pool isp2 overload

 

6. 配置路由：

   ip route 0.0.0.0 0.0.0.0 12.12.12.2 track 10

   ip route 0.0.0.0 0.0.0.0 21.21.21.2 track 20--------配合sla实现双线路冗余，默认配置下cisco路由器是基于目标地址负载均衡

 

 

 

ip route 25.25.25.0 255.255.255.0 21.21.21.2--------实现访问联通网络时从联通线路出外网

将全国的联通地址段全部添加到静态路由表中

 

验证：

R3#show ip route

Gateway of last resort is 21.21.21.2 to network 0.0.0.0

 

     21.0.0.0/24 is subnetted, 1 subnets

C       21.21.21.0 is directly connected, FastEthernet1/0

     12.0.0.0/24 is subnetted, 1 subnets

C       12.12.12.0 is directly connected, FastEthernet1/1

C    192.168.1.0/24 is directly connected, Loopback1

S*   0.0.0.0/0 [1/0] via 21.21.21.2 -----------------显示两条默认路由

               [1/0] via 12.12.12.2

 

R3#traceroute 25.25.25.2 source 192.168.1.1

Type escape sequence to abort.

Tracing the route to 25.25.25.2

 

  1 21.21.21.2 40 msec 76 msec 60 msec ------从联通线路出外网

  2 25.25.25.2 80 msec *  76 msec

附录：联通公网IP地址列表

110.16.0.0/14

110.52.0.0/15

110.6.0.0/15

110.72.0.0/15

112.109.128.0/17

112.111.0.0/16

112.122.0.0/15

112.132.0.0/16

112.192.0.0/14

112.224.0.0/11

112.64.0.0/15

112.80.0.0/13

112.88.0.0/13

112.96.0.0/15

113.0.0.0/13

113.194.0.0/15

113.200.0.0/15

113.204.0.0/14

113.224.0.0/12

113.56.0.0/15

113.58.0.0/16

113.59.0.0/17

113.8.0.0/15

114.240.0.0/12

115.46.0.0/16

115.48.0.0/12

115.85.192.0/18

116.112.0.0/14

116.116.0.0/15

116.2.0.0/15

116.95.0.0/16

117.8.0.0/13

118.212.0.0/16

118.72.0.0/13

118.80.0.0/15

119.108.0.0/15

119.112.0.0/13

119.162.0.0/15

119.164.0.0/14

119.176.0.0/12

119.248.0.0/14

119.36.0.0/16

119.39.0.0/16

119.4.0.0/14

119.48.0.0/13

119.62.0.0/16

120.0.0.0/12

120.80.0.0/13

121.16.0.0/13

121.24.0.0/14

121.28.0.0/15

121.30.0.0/16

121.31.0.0/16

122.136.0.0/13

122.156.0.0/14

122.192.0.0/14

122.96.0.0/15

123.112.0.0/12

123.128.0.0/13

123.138.0.0/15

123.144.0.0/14

123.148.0.0/16

123.152.0.0/13

123.188.0.0/14

123.232.0.0/14

123.4.0.0/14

123.8.0.0/13

124.128.0.0/13

124.160.0.0/16

124.161.0.0/16

124.162.0.0/16

124.163.0.0/16

124.164.0.0/14

124.64.0.0/15

124.66.0.0/17

124.67.0.0/16

124.88.0.0/16

124.89.0.0/17

124.89.128.0/17

124.90.0.0/15

124.92.0.0/14

125.211.0.0/16

125.32.0.0/16

125.33.0.0/16

125.34.0.0/16

125.35.0.0/17

125.35.128.0/17

125.36.0.0/14

125.40.0.0/13

175.42.0.0/15

202.102.128.0/21

202.102.136.0/21

202.102.144.0/20

202.102.224.0/21

202.102.232.0/21

202.102.240.0/20

202.106.0.0/16

202.107.0.0/17

202.108.0.0/16

202.110.0.0/18

202.110.192.0/18

202.110.64.0/18

202.111.128.0/19

202.130.224.0/19

202.38.143.0/24

202.96.0.0/18

202.96.64.0/21

202.96.72.0/21

202.96.80.0/20

202.97.128.0/18

202.97.192.0/19

202.97.224.0/21

202.97.232.0/21

202.97.240.0/20

202.98.0.0/21

202.98.8.0/21

202.99.0.0/18

202.99.104.0/21

202.99.112.0/20

202.99.128.0/19

202.99.160.0/21

202.99.168.0/21

202.99.176.0/20

202.99.192.0/21

202.99.200.0/21

202.99.208.0/20

202.99.224.0/21

202.99.232.0/21

202.99.240.0/20

202.99.64.0/19

202.99.96.0/21

203.93.192.0/18

203.93.64.0/18

203.93.8.0/24

210.13.0.0/18

210.13.128.0/17

210.13.64.0/18

210.14.160.0/19

210.14.192.0/19

210.15.128.0/18

210.15.32.0/19

210.15.96.0/19

210.21.0.0/17

210.51.0.0/16

210.52.128.0/17

210.53.0.0/17

210.53.128.0/17

210.74.128.0/19

210.74.96.0/19

210.78.0.0/19

210.78.160.0/19

210.78.192.0/18

210.82.0.0/15

211.144.0.0/15

211.90.0.0/15

211.92.0.0/15

211.94.0.0/15

211.96.0.0/15

218.10.0.0/16

218.104.0.0/17

218.104.128.0/19

218.104.160.0/19

218.104.192.0/21

218.104.200.0/21

218.104.208.0/20

218.104.224.0/19

218.105.0.0/16

218.106.0.0/15

218.11.0.0/16

218.12.0.0/16

218.21.128.0/17

218.24.0.0/15

218.26.0.0/16

218.27.0.0/16

218.28.0.0/15

218.56.0.0/14

218.60.0.0/15

218.67.128.0/17

218.68.0.0/15

218.7.0.0/16

218.8.0.0/15

219.154.0.0/15

219.156.0.0/15

219.158.0.0/17

219.158.128.0/17

219.159.0.0/18

220.192.0.0/15

220.194.0.0/15

220.196.0.0/14

220.200.0.0/13

220.248.0.0/14

220.252.0.0/16

221.0.0.0/15

221.10.0.0/16

221.11.0.0/17

221.11.128.0/18

221.11.192.0/19

221.11.224.0/19

221.12.0.0/17

221.12.128.0/18

221.13.0.0/18

221.13.128.0/17

221.13.64.0/19

221.13.96.0/19

221.14.0.0/15

221.192.0.0/15

221.194.0.0/16

221.195.0.0/16

221.196.0.0/15

221.198.0.0/16

221.199.0.0/19

221.199.128.0/18

221.199.192.0/20

221.199.224.0/19

221.199.32.0/20

221.199.48.0/20

221.199.64.0/18

221.2.0.0/16

221.200.0.0/14

221.204.0.0/15

221.206.0.0/16

221.207.0.0/18

221.207.128.0/17

221.207.64.0/18

221.208.0.0/14

221.212.0.0/16

221.213.0.0/16

221.214.0.0/15

221.216.0.0/13

221.3.0.0/17

221.3.128.0/17

221.4.0.0/16

221.5.0.0/17

221.5.128.0/17

221.6.0.0/16

221.7.0.0/19

221.7.128.0/17

221.7.32.0/19

221.7.64.0/19

221.7.96.0/19

221.8.0.0/15

222.128.0.0/14

222.132.0.0/14

222.136.0.0/13

222.160.0.0/15

222.162.0.0/16

222.163.0.0/19

222.163.128.0/17

222.163.32.0/19

222.163.64.0/18

58.144.0.0/16

58.16.0.0/16

58.17.0.0/17

58.17.128.0/17

58.18.0.0/16

58.19.0.0/16

58.20.0.0/16

58.21.0.0/16

58.22.0.0/15

58.240.0.0/15

58.242.0.0/15

58.244.0.0/15

58.246.0.0/15

58.248.0.0/13

60.0.0.0/13

60.10.0.0/16

60.11.0.0/16

60.12.0.0/16

60.13.0.0/18

60.13.128.0/17

60.13.64.0/18

60.14.0.0/15

60.16.0.0/13

60.208.0.0/13

60.216.0.0/15

60.218.0.0/15

60.220.0.0/14

60.24.0.0/14

60.28.0.0/15

60.30.0.0/16

60.31.0.0/16

60.8.0.0/15

61.133.0.0/17

61.134.128.0/18

61.134.192.0/18

61.134.96.0/19

61.135.0.0/16

61.136.0.0/18

61.136.64.0/18

61.137.128.0/17

61.138.0.0/18

61.138.128.0/18

61.138.64.0/18

61.139.128.0/18

61.148.0.0/15

61.156.0.0/16

61.158.0.0/17

61.158.128.0/17

61.159.0.0/18

61.161.0.0/18

61.161.128.0/17

61.162.0.0/16

61.163.0.0/16

61.167.0.0/16

61.168.0.0/16

61.176.0.0/16

61.179.0.0/16

61.180.128.0/17

61.181.0.0/16

61.182.0.0/16

61.189.0.0/17

61.240.0.0/14

61.48.0.0/14

61.52.0.0/15

61.54.0.0/16

61.55.0.0/16