RSTP ok?

[BrianKES]

Goodday Everyone,

I have some MAC Address flapping and now i see something weird.
Maybe its correct but i want to clarify that
My GS-SW-00 says its RSTP ROOT switch but the GS-SW-01 is connected to the internet.
The topology you seeing below is the correct topology.

Is something wrong?

[alemabrahao]

Did you configure the STP priority manually or did you leave it as the default in the switches?

https://documentation.meraki.com/MS/Port_and_VLAN_Configuration/Configuring_Spanning_Tree_on_Meraki_...

Remember that Root will always be the Switch with the lowest configured priority value, we generally configure root with priority 0.

[BrianKES]

Thanks for the quick reply
it is now on auto. And the GS-SW-01 where the internet link is should be my root switch right

[alemabrahao]

Then you must manually set the priority to 0. Never use the default in the Root of the topology.

The bridge ID is a concatenation of the priority and the MAC address of the switch.  So as far STP it is concerned, this is a new root bridge.

[alemabrahao]

The root must be the L3 switch on your network, i.e. your core switch.

[BrianKES]

we only have l2 switches ms120 and ms125

[alemabrahao · Accepted solution]

So in this case, configure ROOT on the switch closest to your MX, which I believe is the L3 of the network.

[BrianKES]

Thanks for your awnser