MSTP BPDU Guard
The MSTP BPDU Guard feature protects against misconfiguration of edge ports.
Note |
In order to enable the MSTP BPDU Guard feature for an interface, the command portfast bpduguard must be configured on it. |
Port Fast
The Port Fast feature manage the ports at the edge of the switched Ethernet network. For devices that only have one link to the switched network (typically host devices), there is no need to run MSTP, as there is only one available path. Furthermore, it is undesirable to trigger topology changes (and resultant MAC flushes) when the single link fails or is restored, as there is no alternative path.
By default, MSTP monitors ports where no BPDUs are received, and after a timeout, places them into edge mode whereby they do not participate in MSTP. When portfast is explicitly configured on an interface, MSTP considers that interface to be an edge port and removes it from consideration when calculating the spanning tree. And hence the convergence time for the whole network is improved when portfast is configured.
Note |
MSTP BPDU Guard feature is supported by configuring interfaces in port fast mode. BPDU guard feature will error-disable the port on receiving BPDU packets. |