why the switches are designed without power on/off switches?
AfAR TornAdOAsked:
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Sam Simon NasserIT Support ProfessionalCommented:
because switches are meant to work 24/7/365 ... not to be turned off in the end of the day ...
also switches need to be on for monitoring if there is any issues with connectivity.
Don JohnstonInstructorCommented:
I've always operated under the premise that Sam presented.

However the 24/7/365 thing applies to just about every enterprise class router I've worked on and they all have power switches.
atlas_shudderedSr. Network EngineerCommented:
If you are asking about cisco switches there are a couple of things to note

1.  All cisco chassis switches have power switches, generally on the power supply itself
2.  ToR switches generally do not.  This is due to a couple of underlying reasons
2.a  cisco's ToR line originates from the Catalyst line which was acquired and historically had no power switch, rumor is engineers decided to just adopt the practice, ergo no power switch on Catalyst
2.b  Given that ToR switches are subject to more regular contact with we carbon based entities, it is conjectured the power switch is not there to avoid accidental power loss due to bumped switches
3.  On the Nexus line of switches the above seems to hold true for the most part, though you can find models of Nexus that can be argued as ToR with power switches.  All chassis Nexus have power switches

If you are asking about most any other switch manufacturer, you'll find most all of their switches have power switches, the exceptions again being in ToR (when applicable) and for the same reason as mentioned in cisco above.

Another thing to consider is that in most switches of any manufacturer (that I am aware of) where a power switch is on equipment, that equipment has:
1. Replaceable power supplies
2. With each power supply having its own individual power switch

I can't verify or justify the following, but I would imagine that this is so that power flow to and through the power supply can be physically cut prior to replacement in order to avoid spike or short to the equipment itself.

Hope that helps

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atlas_shudderedSr. Network EngineerCommented:
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