Redundant link management switch for use in a stack of...

Details Redundant link management switch for use in a stack of... Redundant link management switch for use in a stack of...

2006-12-05

2006-12-05

To, Doris H. (Department: 2616)

Multiplex communications

Fault recovery

C370S223000

Reexamination Certificate

active

07145864

ABSTRACT:
A redundant link management switch for use in a stack of switches forming a closed-loop link topology, including a stacking module, a processor and a management module. The stacking module has an uplink port for connecting a next-higher switch in the stack and a downlink port for connecting a next-lower switch in the stack. The processor instructs the stacking module to disable a downlink control bus within the downlink port when receiving a disconnect command, and instructs the stacking module to enable the downlink control bus when receiving a reconnect command. The management module asserts the disconnect command if a link status, received from the processor, indicates that the redundant link management switch and the stack of switches are stacked into the closed-loop link topology. Additionally, the management module asserts the reconnect command to recover a redundant link if the management module detects that the closed-loop link topology is changed.

REFERENCES:
patent: 5805817 (1998-09-01), Yu et al.
patent: 6928049 (2005-08-01), Shabtay et al.
patent: 2003/0193891 (2003-10-01), Chen et al.

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