STP root guard

Details STP root guard STP root guard

2006-01-17

2006-01-17

Chin, Wellington (Department: 2664)

Multiplex communications

Network configuration determination

Using a particular learning algorithm or technique

C370S235000, C370S252000, C370S255000, C370S401000, C370S422000, C370S423000, C370S424000

Reexamination Certificate

active

06987740

ABSTRACT:
The Spanning Tree Protocol (STP) chooses a root switch. Each of the other switches has a “root” port and one or more “designated ports(s)” chosen by STP. Packets are transmitted upstream toward the root switch through the root port, and packets designated for downstream switches from the root switch are received by the root port and transmitted through the designated ports. In the invention, an administrator of the core network identifies which switch ports in the core network are boundary ports to customer networks. The administrator designates the boundary ports as “root guard protected” ports (RG ports). The STP then executes as required by the ordinary STP protocol, and if a RG port is selected by the STP to be a root portm then the status of the port is set to “blocked,” and no packets are transmitted through the port.

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