如何實現(xiàn)Cisco雙出口策略
思科公司是全球領先的網(wǎng)絡解決方案供應商，他的功能也是全球領先的，那么你知道如何實現(xiàn)Cisco雙出口策略嗎?下面是學習啦小編整理的一些關于如何實現(xiàn)Cisco雙出口策略的相關資料，供你參考。
什么是策略路由?
策略路由，是一種比基于目標網(wǎng)絡進行路由更加靈活的數(shù)據(jù)包路由轉發(fā)機制。路由器將通過路由圖決定如何對需要路由的數(shù)據(jù)包進行處理，路由圖決定了一個數(shù)據(jù)包的下一跳轉發(fā)路由器。
實現(xiàn)Cisco雙出口策略的方法：
代碼如下: ROUTER>EN
ROUTER#CONFIG T
Router(Config)>int fa 0/0
Router(Config-if)>ip addr 192.168.0.1 255.255.255.0
Router(Config-if)>ip nat inside
Router(Config-if)>ip policy route-map dual_isp
Router(Config-if)>int fa 0/1
Router(Config-if)>ip addr 電信分配的地址
Router(Config-if)>no shut
Router(Config-if)>ip nat outside
Router(Config-if)>int fa 1/0
Router(Config-if)>ip addr 網(wǎng)通分配的地址
Router(Config-if)>no shut
Router(Config-if)>ip nat outside
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 202.102.128.0 255.255.192.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 218.11.0.0 255.254.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 218.21.128.0 255.255.128.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 218.24.0.0 255.254.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 218.26.0.0 255.255.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 218.27.0.0 255.255.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 218.28.0.0 255.254.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 218.56.0.0 255.252.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 218.60.0.0 255.254.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 218.62.0.0 255.255.128.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 218.67.128.0 255.255.128.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 218.68.0.0 255.254.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 218.7.0.0 255.252.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 219.141.128.0 255.255.128.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 219.142.0.0 255.254.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 219.154.0.0 255.254.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 219.156.0.0 255.254.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 219.158.0.0 255.255.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 219.159.0.0 255.255.192.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 202.102.224.0 255.255.224.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 202.106.0.0 255.255.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 202.107.0.0 255.255.128.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 202.108.0.0 255.255.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 202.110.0.0 255.255.128.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 202.110.192.0 255.255.192.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 202.111.128.0 255.255.192.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 202.96.0.0 255.255.192.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 202.96.64.0 255.255.224.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 202.97.128.0 255.255.128.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 202.98.0.0 255.255.224.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 202.99.0.0 255.255.255.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 221.0.0.0 255.252.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 221.10.0.0 255.255.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 221.11.0.0 255.255.128.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 221.11.128.0 255.255.192.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 221.11.192.0 255.255.224.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 221.12.0.0 255.255.128.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 221.12.128.0 255.255.192.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 221.13.0.0 255.255.192.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 221.13.64.0 255.255.224.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 221.13.128.0 255.255.128.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 221.192.0.0 255.255.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 221.196.0.0 255.255.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 221.199.0.0 255.255.224.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 221.199.32.0 255.255.240.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 221.199.128.0 255.255.192.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 221.199.192.0 255.255.240.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 221.200.0.0 255.255.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 221.204.0.0 255.255.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 221.207.0.0 255.255.192.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 221.208.0.0 255.255.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 221.4.0.0 255.255.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 221.6.0.0 255.255.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 221.7.0.0 255.255.192.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 221.7.64.0 255.255.224.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 221.7.128.0 255.255.128.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 221.8.0.0 255.254.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 222.128.0.0 255.240.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 222.160.0.0 255.252.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 222.163.0.0 255.255.224.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 60.0.0.0 255.248.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 60.8.0.0 255.252.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 60.10.0.0 255.252.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 60.12.0.0 255.255.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 60.13.0.0 255.255.192.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 60.13.128.0 255.255.128.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 60.16.0.0 255.240.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 60.208.0.0 255.248.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 60.220.0.0 255.252.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 61.133.0.0 255.255.128.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 61.134.96.0 255.255.224.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 61.134.128.0 255.255.128.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 61.135.0.0 255.255.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 61.136.0.0 255.255.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 61.138.0.0 255.255.128.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 61.138.128.0 255.255.192.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 61.139.128.0 255.255.192.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 61.148.0.0 255.255.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 61.149.0.0 255.255.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 61.156.0.0 255.255.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 61.158.0.0 255.255.0.0
Router(Config)>Access-list 101 permit Ip 192.168.0.0 0.0.0.255 61.159.0.0 255.255.192.0
Router(Config)>Access-list 102 permit Ip any any
Router(Config)>Ip Nat Inside Source Route-map CT_NAT int fa 0/1 overload
Router(Config)>Ip Nat Inside Source Route-map CNC_NAT int fa 1/0 overload
Router(Config)>Route-map CT_NAT Permit 10
Router(Config-route-map)>Match Int Fa 0/1 (這里不會匹配外面發(fā)給它的包，因為DNAT優(yōu)先于路由選擇)
Router(Config)>Route-map CNC_NAT Permit 10
Router(Config-route-map)>Match Int fa1/0 (指這個接口所收到的所有包除了DNAT匹配的，會先進行目標轉換,這樣目標并不會是FA1/0,而是內(nèi)部的一個IP，這里其實可以寫next-hop 便于理解，也便于檢測對方的存在)
Router(Config)>Route-map dual_isp Permit 10
Router(Config-route-map)>Match Ip address 101
Router(Config-route-map)>set ip next-hop 網(wǎng)通網(wǎng)關 電信網(wǎng)關(這里恰好把包發(fā)給了NAT所需要的接口，注意這里只是改變了包的下一跳而不是目標。還要注意這里并不是把包扔給了next-hop而是改變了 尋路方式，轉發(fā)將在此之后進行尋路,之后便是源地址轉換：路由器2大功能尋路，轉發(fā)是分開的，由此可以看出，如果策略NAT里匹配的是對方ISP的地址為 下一跳，那可以檢測對方的存在與否)
Router(Config)>Route-map dual_isp Permit 20
Router(Config-route-map)>Match Ip address 102
Router(Config-route-map)>set ip next-hop 電信網(wǎng)關 網(wǎng)通網(wǎng)關
Router(Config)>Ip Route 0.0.0.0 0.0.0.0 電信網(wǎng)關
Router(Config)>Ip Route 0.0.0.0 0.0.0.0 網(wǎng)通網(wǎng)關
(注意 PBR優(yōu)先于路由，而源地址轉換路由又優(yōu)先于NAT,那PBR會比NAT先進行，所以首先因該是進行PBR把包分類，扔給2個出口，之后再做路由選擇路由 是默認的沒什么，之后就是NAT了，策略一看在2出口上收到的包分別進行自己的策略NAT，當回來的時候，2個出口上收到的包并不會進行源轉換為什么?因 為DNAT優(yōu)先于路由，SNAT比路由還慢,所以DNAT是最先進行的。還有match next hop 匹配多個下一跳是與的關系,也就是說要滿足全部的match才會用動作,所以前面不能match多個nexthop，否則一定砸了，只能match一個 nexthop,當然set可以set多個。 )
此策略路由和策略nat說明：目的地址為網(wǎng)通地址的包全部發(fā)給網(wǎng)通網(wǎng)關，其他一律發(fā)給電信，由于網(wǎng)通地址段較少，所以選擇了做網(wǎng)通的acl條目，減輕工作 量。
以上就是用Cisco路由器雙出口策略實現(xiàn)的步驟與方法，策略nat部分也可以用match acl的方式，但是發(fā)現(xiàn)實際速度很慢，不知道原因，可能是需要逐條匹配吧。但是最好用match interface的方式，因為只有這樣才能實現(xiàn)備份，如果接口down掉，就不會在match接口，但是如果用acl，則會因為永遠match而pat 成已經(jīng)down掉接口的地址，但是路由會從另一接口走掉，同樣很慢了就。地址段在今后逐漸補全。trace分析表明：基本上包都走對路了。而且速度比原來 單接口時訪問其他isp網(wǎng)明顯加快了。
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