Rapid pvstp+

[fabio.marino]

Hi All,

Simple question. I have two switches connected via 1Gb link. They are running rapid pvstp. The layer 2 topology is the one below depicted.

I now need to upgrade the connection with a 10Gb link, keeping the 1 Gb link for backup.

My question is: adding the new link will generate a topology change notification and so a stp recalculation?

I am asking this because reading the documentation of rapid pvstp I got that, as soon a new root is select, as in my case, the transitions of the state of the port is immediate and should not generate any outage.

Below the documentation

Rapid PVST+ provides for rapid recovery of connectivity following the failure of a network device, a switch port, or a LAN. It provides rapid convergence for edge ports, new root ports, and ports connected through point-to-point links as follows:

•Root ports—If Rapid PVST+ selects a new root port, it blocks the old root port and immediately transitions the new root port to the forwarding state.

Thanks.

[devils_advocate]

I suspect there will be a small outage but with Rapid Spanning Tree, it should barely be noticeable.

Bear in mind your MAC address table may need to flush any entries which previously had an outgoing port on the 1Gb link. The entries will need to repopulate to list the outgoing port as whatever the new 10Gb one is.

Thanks