Configuration BPDUs are sent in three cases:

• When the Hello Timer expires (every two seconds by default), the Root Bridge originates a Configuration BPDU on every port (assuming no self-looped ports). This is a part of the normal Configuration BPDU processing.

• When non-Root Bridges receive a Configuration BPDU on their Root Port, they send (propagate) updated Configuration BPDUs on all of their Designated Ports (normal processing).

• When a Designated Port hears an inferior Configuration BPDU from another switch, it sends a Configuration BPDU of its own to suppress the less attractive information.

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