234 Chapter 7 Web cache configuration300868-GRefreshing cache entriesTo increase response times for Web entries, enable active refresh. This optionattempts to keep the most frequently requested Web entries available in the cacheby refreshing them from the Internet. Rather than wait for a request for Webcontent, the Instant Internet unit actively evaluates the entries in the cache, teststhem, and reloads them if necessary before they expire.Actively refreshing Web entries helps to save bandwidth overall, but creates aslight increase in bandwidth because the cache server functions as another userrequesting Web content.Setting active refresh optionsNortel Networks recommends that you set active refresh to operate during yourcompany’s normal business hours. For example, if your company’s business hoursare Monday through Friday, from 8 AM to 5 PM, select each week day and set thestart time to 8:00 AM and the duration to 9 hours and 00 minutes. The same timeis used for each selected day.To enable active refresh and set refresh options:1 On the Home page, click Web Cache.The Web Cache page opens.2 On the Web Cache page, click Configure.The Web Cache Configuration page opens.3 In the Active Refresh area, click Options.The Active Refresh Options page opens.4 Select the Enable Active Refresh check box and then configure active refreshsettings.Click Help for more information about each field on any page.Note: Disable active refresh or limit its use if you pay Internet accessfees based on usage time.
