Optimizing Spanning-Tree Operations
There are a couple of enhancements that have been made to the original STP standard. A few
of these started out as Cisco proprietary features and then later were changed and made into
the new version of STP called Rapid STP (RSTP).
TABLE 5 . 9 Options for RSTP
Option Meaning
portfast Configures a switch port to immediately transition to forwarding
and not wait for the STP timer
interface range Allows you to choose a range of interfaces to configure
bpdufilter Filters BPDUs from entering a switch port
bpduguard Shuts down a switch port if it receives a BPDU
uplinkfast Configures spanning tree to find and maintain a secondary link
to the root bridge
backbonefast Configures spanning tree to maintain an alternate path to the
root bridge in case there is a failure that is not directly connected
to itself
mode Configures the spanning tree mode to either MST, PVST, or
Rapd-pvst it’s ok