Spanning tree loop guard

Details Spanning tree loop guard Spanning tree loop guard

2006-06-12

2008-12-02

Cho, Hong Sol (Department: 2619)

Multiplex communications

Network configuration determination

Using a particular learning algorithm or technique

C370S402000, C370S408000, C709S238000

Reexamination Certificate

active

07460492

ABSTRACT:
A system and method are provided to prevent the formation of loops in a network. The network device includes a plurality of ports for receiving and forwarding network messages and a spanning tree protocol engine. The spanning tree protocol engine, in one embodiment, implements the Rapid Spanning Tree Protocol (RSTP) to transitions the ports among a plurality port states, including a discarding state, a learning state and a forwarding state. The network device further includes a loop guard engine that is in a communicating relationship with the spanning tree protocol engine and the ports. The loop guard engine monitors the receipt of bridge protocol data units (BPDUs) by the ports. If a given port stops receiving BPDUs, the loop guard engine prevents the spanning tree protocol engine from transitioning the given port to the forwarding state. Instead, the loop guard engine causes the port to transition to loop inconsistent state.

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