User Manual

219
Users Manual of XGS-6350-24X4C
spanning-tree portfast bpdufilter Globally enables bpdu filter feature. It is
valid to all interfaces.
no spanning-tree portfast bpdufilter Globally disables bpdu filter feature.
Instruction:
Globally enabling port fast feature may result in broadcast storm. The BPDU Guard or BPDU Filter should be
configured for protection sake.
Follow these steps to enable the BPDU filter feature in the interface configuration mode :
Command Purpose
spanning-tree bpdufilter enable Enables bpdu filter feature on the
interface.
spanning-tree bpdufilter disable Disables bpdu filter feature. It has no
effect on the global configuration.
no spanning-tree bpdufilter Disables bpdu filter feature. It has no
influence on the global configuration.
20.1.2.5 Configuring Uplink Fast
If a switch loses connectivity, it begins using the alternate paths as soon as the spanning tree selects a new
root port. By enabling UplinkFast with the spanning-tree uplinkfast global configuration command, you can
accelerate the choice of a new root port when a link or switch fails or when the spanning tree reconfigures
itself. The root port transitions to the forwarding state immediately without going through the listening and
learning states, as it would with the normal spanning-tree procedures.
Uplink Fast feature is only valid in SSTP/PVST mode.
Follow these steps to globally enable UplinkFast.:
Command Purpose
spanning-tree uplinkfast Enables uplink fast feature.
no spanning-tree uplinkfast Disables uplink fast feature.
20.1.2.6 Configuring Backbone Fast
BackboneFast is a complementary technology to the UplinkFast feature, which responds to failures on links
directly connected to access switches. BackboneFast optimizes the maximum-age timer, which controls the
amount of time the switch stores protocol information received on an interface. When a switch receives an
inferior BPDU from the designated port of another switch, the BPDU is a signal that the other switch might
have lost its path to the root, and BackboneFast tries to find an alternate path to the root.
Backbone fast feature is only valid in SSTP/PVST mode.
Follow these steps to globally enable BackboneFast.: