基于包大小的策略路由

 【拓扑和软件】

 

 

 本文实验采用的交换机是H3C模拟器，下载地址如下：

 

http://forum.h3c.com/forum.php? 

 

mod=viewthread&tid=109740&highlight=H3C%E6%A8%A1%E6%

 

8B%9F%E5%99%A8 有兴趣的朋 友可以在论坛上去下载

 

【组网需求】

 

R1，R2，R3,R4之间跑动态路由

从R1的S0/6/3进来的数据包

长度为1-63的走192.168.12.2

长度为64-10000的走192.168.13.2

 

其他长度的报文按路由表查找

 

 

 

【配置信息】

R1:

 

interface Serial0/6/0

 link-protocol ppp

 ip address 192.168.12.1 255.255.255.0

#

interface Serial0/6/1

 link-protocol ppp

 ip address 192.168.13.1 255.255.255.0

#

interface Serial0/6/2

 link-protocol ppp

#

interface Serial0/6/3

 link-protocol ppp

 ip address 172.16.15.1 255.255.255.0

 ip policy-based-route lab1

#

 

#

ospf 1

 area 0.0.0.0

  network 192.168.12.0 0.0.0.255

  network 192.168.13.0 0.0.0.255

  network 172.16.15.0 0.0.0.255

#

policy-based-route lab1 permit node 10

   if-match packet-length 1 63

   apply ip-address next-hop 192.168.12.2

policy-based-route lab1 permit node 20

   if-match packet-length 64 10000

   apply ip-address next-hop 192.168.13.2

#

 

 

R2:

 

interface Serial0/6/0

 link-protocol ppp

 ip address 192.168.12.2 255.255.255.0

#

interface Serial0/6/1

 link-protocol ppp

 ip address 192.168.24.1 255.255.255.0

 

 

#

ospf 1

 area 0.0.0.0

  network 192.168.24.0 0.0.0.255

  network 192.168.12.0 0.0.0.255

 

 

 

R3:

 

interface Serial0/6/0

 link-protocol ppp

 ip address 192.168.34.1 255.255.255.0

#

interface Serial0/6/1

 link-protocol ppp

 ip address 192.168.13.2 255.255.255.0

#

ospf 1

 area 0.0.0.0

  network 192.168.13.0 0.0.0.255

  network 192.168.34.0 0.0.0.255

#

 

R4:

#

interface Serial0/6/0

 link-protocol ppp

 ip address 192.168.34.2 255.255.255.0

#

interface Serial0/6/1

 link-protocol ppp

 ip address 192.168.24.2 255.255.255.0

 

#

interface NULL0

#

interface LoopBack0

 ip address 10.1.1.1 255.255.255.255

#

ospf 1

 area 0.0.0.0

  network 192.168.24.0 0.0.0.255

  network 192.168.34.0 0.0.0.255

  network 10.1.1.1 0.0.0.0

#

R5:

#

interface Serial0/6/3

 link-protocol ppp

 ip address 172.16.15.2 255.255.255.0

 

 

 ip route-static 0.0.0.0 0.0.0.0 172.16.15.1

 

 

【验证】

 

 

在R5上ping 10.1.1.1   在R1上开启debugging 信息

 

 

<R5>ping 10.1.1.1

  PING 10.1.1.1: 56  data bytes, press CTRL_C to 

 

break

    Reply from 10.1.1.1: bytes=56 Sequence=1 ttl=253 

 

time=4 ms

    Reply from 10.1.1.1: bytes=56 Sequence=2 ttl=253 

 

time=4 ms

    Reply from 10.1.1.1: bytes=56 Sequence=3 ttl=253 

 

time=10 ms

    Reply from 10.1.1.1: bytes=56 Sequence=4 ttl=253 

 

time=10 ms

    Request time out

 

  --- 10.1.1.1 ping statistics ---

    5 packet(s) transmitted

    4 packet(s) received

    20.00% packet loss

    round-trip min/avg/max = 4/7/10 ms

 

 

 

<R1>

*Feb 28 19:51:51:578 2013 R1 PBR/7/POLICY-ROUTING:IP 

 

policy based routing success : POLICY_ROUTEMAP : 

 

lab1, Node : 20, next-hop : 192.168.13.2

*Feb 28 19:51:51:781 2013 R1 PBR/7/POLICY-ROUTING:IP 

 

policy based routing success : POLICY_ROUTEMAP : 

 

lab1, Node : 20, next-hop : 192.168.13.2

*Feb 28 19:51:51:984 2013 R1 PBR/7/POLICY-ROUTING:IP 

 

policy based routing success : POLICY_ROUTEMAP : 

 

lab1, Node : 20, next-hop : 192.168.13.2

*Feb 28 19:51:52:187 2013 R1 PBR/7/POLICY-ROUTING:IP 

 

policy based routing success : POLICY_ROUTEMAP : 

 

lab1, Node : 20, next-hop : 192.168.13.2

*Feb 28 19:51:52:406 2013 R1 PBR/7/POLICY-ROUTING:IP 

 

policy based routing success : POLICY_ROUTEMAP : 

 

lab1, Node : 20, next-hop : 192.168.13.2

 

<R5>

如上，如果按照R1的路由表，都应当走 192.168.12.2 ，但是因为有策略路由，下一跳指向了192.168.13.2 实验完成

<R1>dis ip ro

Routing Tables: Public

        Destinations : 14       Routes : 15

 

Destination/Mask    Proto  Pre  Cost         NextHop         Interface

 

10.1.1.1/32         OSPF   10   3124         192.168.12.2    S0/6/0

                    OSPF   10   3124         192.168.13.2    S0/6/1