Patent
Spanning tree loop guard
Maurizio Portolani,Shyamasundar S. Kaluve,Marco E. Foschiano +2 more
- 12 Jun 2006
61
TL;DR: In this paper, a spanning tree protocol engine, in one embodiment, implements the Rapid Spanning Tree Protocol (RSTP) to transition the ports among a plurality of port states, including a discarding state, a learning state and a forwarding state.
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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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Citations
Patent
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Naoki Oguchi
- 30 Dec 2002
TL;DR: In this paper, a frame forwarding system is designed to prevent backbone links from being blocked even when there is a backdoor link that forms a potential loop in the network, which enables all the frame forwarding devices and internode links to behave as a single virtual device for forwarding frames between external networks that belong to a particular group.
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- 27 Jan 2005
TL;DR: In this paper, a virtual network device (202) includes several different virtual network devices sub-units, e.g., (122(1) and 122(2)), which collectively operate as a single logical network device.
98
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Method for preventing control packet looping and bridge apparatus using the method
Masaki Hirota,Kazuto Nishimura,Yasushi Sasakawa,Kou Takatori +3 more
- 28 Dec 2004
TL;DR: In this article, a method for preventing a control packet loop in a network realizing node redundancy or circuit redundancy based on a rapid spanning tree or a multiple spanning tree protocol is disclosed, which includes the steps of detecting a loop of a control packets of the RST protocol and discarding the control packet by which the loop is detected so as to prevent occurrence of the loop.
78
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System and method for preventing count-to-infinity problems in ethernet networks
Khaled Elmeleegy,Alan L. Cox,Tze Sing Eugene Ng +2 more
- 02 Apr 2007
TL;DR: In this paper, the authors proposed a method for preventing a count-to-infinity problem in a network using epochs of sequence numbers in protocol messages to eliminate stale protocol information in the network and to allow the forwarding topology to recover in merely one round trip time across the network.
76
Patent
Optimal sync for rapid spanning tree protocol
Shyamasundar S. Kaluve,Norman W. Finn +1 more
- 12 Jan 2007
TL;DR: In this paper, a rapid spanning tree protocol (RSTP) is executed on an intermediate network device, where the RSTP may designate a first port of the device to a Root Port Role and designate one or more second ports of the devices to designated Port Roles.
74
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