通过调整OSPF链路开销，可以达到引导数据流量的目的。
本练习的目标是：
1）了解怎样通过配置命令调整OSPF的链路cost值来达到重定向流量到其他链路的目的。
2）使用show命令进行相关验证。
附件包含拓扑、步骤及指令、验证三部分。
本实验通过Juniper模拟器实现，所有接口名称均为em开头。如果是实际设备请将此接口名称进行替换。
拓扑图如下：
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部分内容摘要如下：
Adjusting OSPF Link Costs Configuration Overview
Adjusting OSPF link cost could redirect the traffic between the multiple paths. It always used in migration or software upgrade scenario.
Part Three: Adjusting OSPF Link Cost
From the traceroute result shown above, we can found the route between 1.1.1.1 and 3.3.3.3 are go through the primary path (R1-R2-R3) for it have the lowest metric 2 to destination than the secondary path, the default metric for fast Ethernet interface is 1, thus the routes traverse 2 FE links , so the total cost is 1+1=2, likewise, the metric for secondary path is 3.
Now, the next step is adjusting link cost , so the traffic will be redirect to secondary path. We could change the link metric between the R2 and R3 to a bigger value, the traffic will then redirect.
Using the following script to adjusting the cost.
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lab@aaa# show | display set | match metric
set logical-routers R2 protocols ospf area 0.0.0.0 interface em0.23 metric 100
set logical-routers R3 protocols ospf area 0.0.0.0 interface em1.23 metric 100
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