Bridge Agreement Abstracts Unit (BPDU) Guard
Bridge agreement abstracts units (BPDU) are abstracts letters exchanged amid bridges application spanning timberline protocol
to ascertain loops in a arrangement topology. BPDU contains administration and ascendancy abstracts advice that is acclimated to
determine the base arch and authorize the anchorage roles—for example: root, designated, or blocked port.
The BPDU Bouncer affection is advised to accumulate the alive cartography anticipated and to enhance about-face network
reliability by administration the STP area borders.
The bouncer can be enabled globally on the about-face or enabled on a per-interface basis. In a accurate configuration,
ports with anchorage fast enabled do not accept BPDUs. Receiving a BPDU on a anchorage with anchorage fast enabled signals an
invalid configuration, such as the affiliation of an crooked device, and the BPDU Bouncer affection puts the
interface in the error-disabled state.
At the all-around level, BPDU Bouncer can be enabled on a anchorage with anchorage fast enabled application the spanning-tree
portfast bpduguard absence all-around agreement command. Spanning timberline shuts bottomward interfaces that are in a
port fast operational state.
At the interface level, BPDU Bouncer can be enabled on an interface by application the spanning-tree bpduguard
enable interface agreement command after additionally enabling the anchorage fast feature. When the interface
receives a BPDU, the about-face assumes that a botheration exists and puts the interface in the error-disabled state.
The BPDU Bouncer affection provides a defended acknowledgment to invalid configurations because you charge manually put
the interface aback in service. In a service-provider arrangement environment, the BPUD Bouncer affection can be used
to anticipate an admission anchorage from accommodating in the spanning tree.