Dual Cisco Merakis (Primary and Warm Spare) Warm spare is causing looping when plugged into the network


I recently purchased two Cisco Meraki routers. I had some old netgear non-managed switches that I thought was causing my looping problem, so I went out and bought what I thought at the time was a new managed switch. It turns out that it's considered non-managed, but it does get its own IP, and there's some configuration that can be done. I picked a Netgear GS108EV3 ProSafe Plus switch because it had loop detection. I enabled the loop detection, and plugged both Merakis into it, and could tell right away that it was doing the same thing as the other old switches where the lights would flash very quickly, and basically disrupts the whole network. I figured with this new switch that the loop detection was Spanning Tree Protocol, but that may or may not be the case. Not sure if I need a true managed switch for this or not. I've seen posts on the internet where people have used STP with a non-managed switches, so I think what I'm trying to do isn't out of the realm of possibility. Not sure what I'm doing wrong, so any help is greatly appreciated.


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By default loop detection is disabled on GS108EV3 ProSafe Plus as can be seen on page 42.

Enable or disable loop detection:
Select System > Management
In the Loop Detection list, select Enable or Disable

But sentence
Loop detection is indicated on the switch when the LEDs of a port blink at a constant speed.

I am not sure does this means that it can detect and prevent loops or just indicate that there is one. :)

And, also, switches - managed or unmanaged never create loop by itself. The way you connect switches does the job.
If you have more than one link from one switch to another you create loop. Or if you have more than 2 switches and connect them circularly , let say you have switches SW1, SW2 and SW3 and you connect them one to another. SW1 you can connect to SW2 and SW3 you can to that without creating loop, and as soon as you connect SW2 to SW3 you have loop in your network.

To allow multiple connections between switches or circulatory connections (and not create permanent loop) you need switches capable of detecting and preventing loops. Some variation of STP need to be present on switches (STP - 802.1d, RSTP - 802.1w, MSTP - 802.1s) and even then if you mix different manufacturers can be inoperative in some cases.

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WhahAuthor Commented:
Hi Predrag,

Good catch! The subtleties of the English language got me again. Thanks for the help.

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