@shberge Thank you so much. Maybe i didn't pay attention to this "issue" the first time.

@shberge is it also normal for ALL the Link/Act LEDs on the switch to flicker all at once in the exact way for the all the ports ? including aps, wan and oc200 ? it is like all the devices are transmiting the same information at the same time over the network ...

@Razvan9 

No it usually flashes a little different, but I do not know the switch so ask on the switch and router forum :-)

Check that there is no network loop in the net, etc. try and remove one and one cable to see if the lamps change how they blink.

Hi @Razvan9,

Yes, this activity on switches is very common.  These broadcast or multicast packets get forwarded to all of the switch ports.  You'll see this when "things are idle."  If you start transferring a big file, for example, from the internet through your switch to a PC or AP.  You'll see two of the ports flash much more quickly -- the one connected to your router and the one connected to your client.

-Jonathan

But as @shberge said,

It's very important to make sure you don't have any loops.  Modern Ethernet uses what's called "Star Topology."  Cables radiate out from one or more central points (outets on your router or a switch).  No additional cables should be coming back (since each individual cable is bidirectional already).

Most of the time, unless you have multiple switches, etc.  It's pretty rare to make a loop accidentally because each individual device (PC, Access Point, Roku/TV/Xbox/etc.) only has one port.

-Jonathan