Sizing the Network

Sizing the Network
Each device uses the timers configured on the root bridge. If the timers need to be changed, Cisco
recommends that they not be changed directly. Instead, first experiment with the spantree
diameter option. It will set the timers based on the size of the switched network. The larger the
network, the more time is allowed for propagation, which increases the timers. The default diameter
is seven switches across. Setting the diameter smaller than your actual network size
increases the chance of broadcast storms.