I just ahave a quick question please. If we have a topology of L2 switches where in we have two paths avaialble to the root bridge, and one of them has higher bandwidth. How do i tell my switch to choose the path that goes to the root bridge having a higher bandwidth.
Same type of interface or different type (FastE vs GigE)?
If same type, you can manually select which interface is the root port by using the spanning-tree cost command.
The default value is derived from the media speed of the interface, so if you have different interfaces, this is done automatically for you.
Secondly, somebody asked me what is port fast? I told them that inorder to enable bpdu filtering, we enable the ports with port fast so that clients connecting to our switch (from client edge) do not participate in our STP process. In order for us to do that we need to have portfast enabled on those ports. Is that a correct reply? Or did i mess up the question?
Spanning-tree PortFast causes a port to enter the spanning-tree forwarding state immediately, bypassing the listening and learning states.
You don't need to enable PortFast for BPDU Filtering unless you are referring to the global BPDU Filtering command.
BPDU Filtering can also be enabled under the interface without the PortFast requirement.
Regards,
Edison
