The age value may be rounded off to the nearest multiple of 5 seconds.If the system rounds the value to a different value from that specified by the user (from the rounding process), the system returns an informational message.When you use this command in EXEC mode, the age values of all VLANs for which a configuration has not been specified are modified and those VLANs with specifically modified aging times are not modified.Those VLANs with specifically modified aging times are not modified.
When you use this command and specify a VLAN, the aging time for only the specified VLAN is modified. The aging time is counted from the last time that the switch detected the MAC address. Regularly schedule breaks for your eyes is the most frequently recommended method for preventing eye strain. Recent studies have shown the bluish glow of our screens also reduces the bodys melatonin levels that we need to naturally sleep, causing people to stay up later and have more difficulty falling asleep when they do go to bed. Doctors often recommend taking breaks from looking at your screen to prevent eye strain, but not everyone is so good at sticking to schedules on their own. Here are eight free web or mobile apps to help keep your eyes healthy and pain-free 1. Timer Mac Awareness IsAwareness (Mac, Windows) image source: Cult of Mac Awareness is a free app for Mac and Windows that gets you to take regular breaks without getting in the way. Its super inconspicuous as far as these apps go; it sits on your menu bar while you go about your business, quietly counting the minutes until your next small break. You set the time limit for chunks of uninterrupted work yourself, as well as how long your breaks are. ![]() And it actually makes sure you take that break by monitoring your appbrowser usage for those minutes, but doesnt lock you out. This is probably the simplest, easiest app to use if youre looking for break reminders that get you to actually do them without being intrusive. Without that glaring blue glow, I actually have to go to sleep at a reasonable hour because I get sleepy. Which, ya know, is supposed to happen F.lux has an incredibly detailed list of research on this issue here. Timer Install And ItIts an easy install and it runs on a bunch of operating systems. This is probably my 1 recommendation from this list. ProtectYourVision (Chrome, Firefox, Safari app) One of the most popular apps out there is ProtectYourVision. You can customize its break plan, though the default 20-20-20 plan is a commonly used technique with many supporters. ![]() So, its a little disruptive in that way, but you can choose not to take a break when prompted, meaning the screen wont black out until you say youre on your break. If you really need to, you can override the break-time blackout as well. Plus, the app gives you suggestions for eye exercises to do during your break, and it has an adorable robot mascot. Twilight also operates based on research done on the effects of blue-tinted light on the circadian rhythm and overall quality of sleep. The developers also cited special interest in research showing people who used a tablet or smartphone for a couple hours before bed fell asleep about an hour later than those who did not. So if you have a mobile device that runs on Android and want to employ this technology to protect your eyes and stop having trouble getting properly sleepy, get Twilight. Time Out (Mac). It gives you a set break plan that involves 50 minute chunks of working with 10 minute breaks, as well as micro breaks throughout your work time, 10 seconds every 10 minutes. ![]() If you only want one kind of break, you can disable either of them. The breaks will fade your screen to let you know its time, and then fade back in when the break is over. Care (Chrome app) If you like your apps connected to your browser for a little extra convenience, eyeCare is a Chrome extension to help remind you to take those eye-resting breaks. Like ProtectYourVision, this app recommends the 20-20-20 plan, but you can of course customize your schedule.
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