Sunday, December 22, 2019

What causes the STP root to constantly change?

I've got a mix of Cisco, EnGenius, and Netgear switches and have had various problems with network dropping out while the STP root changes multiple times 20 or so times in the span of a minute.

There isn't anything special on my network (hub and spoke switch arrangement, no LAGs) only modification compared to a factory default config is a VLAN for guest WiFi traffic.

We've got Fortigate firewalls with STP enabled on the LAN interface

We also have ACTi security cameras, UniFi UAP's and a CloudKey

Screenshot



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