引用是在用户访问命名空间中包含目标的命名空间根路径或文件夹时，客户端计算机从域控制器或命名空间服务器接收的目标的排序列表。 你可以调整在请求新引用之前客户端缓存引用的时间。
更改客户端缓存命名空间根路径引用的时间的步骤
Click Start, point to Administrative Tools, and then click DFS Management.
In the console tree, under the Namespaces node, right-click a namespace, and then click Properties.
On the Referrals tab, in the Cache duration (in seconds) text box, type the amount of time (in seconds) that clients cache namespace root referrals. 默认设置为 300 秒（五分钟）。
Tip
To change the amount of time that clients cache namespace root referrals by using Windows PowerShell, use the Set-DfsnRoot TimeToLiveSec cmdlet. Windows Server 2012 中引入了这些 cmdlet。
更改客户端缓存文件夹引用的时间的步骤
Click Start , point to Administrative Tools, and then click DFS Management.
In the console tree, under the Namespaces node, right-click a folder that has targets, and then click Properties.
On the Referrals tab, in the Cache duration (in seconds) text box, type the amount of time (in seconds) that clients cache folder referrals. 默认设置为 1800 秒（30 分钟）。