| US 7,599,284 B1 | ||
| Restartable spanning tree for high availability network systems | ||
| Marco Di Benedetto, Santa Clara, Calif. (US); Ramana Mellacheruvu, San Jose, Calif. (US); and Umesh Mahajan, Cupertino, Calif. (US) | ||
| Assigned to Cisco Technology, Inc., San Jose, Calif. (US) | ||
| Filed on May 16, 2005, as Appl. No. 11/130,286. | ||
| Application 11/130286 is a continuation of application No. 09/644377, filed on Aug. 23, 2000, granted, now 6,898,189, filed on May 24, 2005. | ||
| Application 09/644377 is a continuation of application No. 09/208175, filed on Dec. 09, 1998, granted, now 6,628,624, filed on Sep. 30, 2003. | ||
| Application 09/208175 is a continuation of application No. 09/283111, filed on Mar. 31, 1999, granted, now 6,801,506, filed on Oct. 05, 2004. | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. G01R 31/08 (2006.01); H04L 12/28 (2006.01); G06F 15/177 (2006.01) | ||
| U.S. Cl. 370—216 [370/256; 370/419; 709/221] | 21 Claims |
| 1. A method for operating a network device comprising:
designating a first supervisor to be an active supervisor and a second supervisor to be a standby supervisor for the network
device;
running a spanning tree protocol (STP) at the active supervisor such that the active supervisor elects a root device for the
computer network, and transitions ports of the network device among a plurality of spanning tree port states; and
in response to a failure at the active supervisor, running the spanning tree protocol at the standby supervisor utilizing
the spanning tree port states of the ports.
|