RSTP costs not being properly calculated with LAG

Hi,

I’m using a CRS309-1G-8S+ and a CRS326-24S+2Q+ in my environment alongside a fair amount of Cisco switches.

On the Mikrotik and Cisco switches the port cost calculation mode is set to long.

On the Cisco switches, I can see the cost of a 10gb link is showing as 2000, a teamed 2x10gb link is 1000, and a team of 3x10gb is 660.

While SwOS doesn’t give the detailed info that I can easily get on the cisco switches, I can derive from the ‘root path cost’ values on the RSTP page that it is giving the same cost of 2000 to a teamed link of 2x10gb ports as to a single 10gb port.

This is apparent on both of the switches.

Any chance this can be fixed?

Sorry, meant to add both switches are running the latest version of SwOS, 2.13