不同的接口和网桥可能有不同的速度，当选择链路时这个值将用做参考。快速的接口应该具有较小的代价。
Each interface in a bridge could have a different speed and this value is used when deciding which link to use. Faster interfaces should have lower costs.
例如，企业能以几条t - 1链路的代价建立一条t - 3或oc - 3链接，把增加的带宽在整个机构内进行分配。
For example, the enterprise could establish a T-3 or OC-3 connection forth cost of several T-1 links and distribute incremental bandwidth throughout the organization.
研究具有时延约束的最小代价组播路由问题，提出一种基于链路优化的组播路由算法求解该问题。
Delay-constrained least-cost multicast routing problem is studied, and a multicast routing algorithm based on link optimizing is proposed to solve the problem.
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