Dormant backup link for OSPF network protection

Details Dormant backup link for OSPF network protection Dormant backup link for OSPF network protection

2007-06-19

2007-06-19

Coulter, Kenneth R. (Department: 2141)

Electrical computers and digital processing systems: multicomput

Computer-to-computer data routing

Alternate path routing

Reexamination Certificate

active

09739902

ABSTRACT:
A method and apparatus provides protection against resource failures in Open Shortest Path First (OSPF) networks, without increasing the complexity of the network topology and/or management. An internal router (IR) automatically maintains a back-up link in a dormant state until a network failure affecting communications with a primary adjacent area border router (ABR) is detected. Upon detection of the network failure, the IR activates the back-up link in order to enable traffic flow to an alternate adjacent ABR, which by-passes the network failure. Upon recovery of communications with the primary adjacent ABR, the IR automatically deactivates the back-up link and resumes traffic flow through the primary adjacent ABR. As a result, traffic is forwarded into the back-up link only when communications with the primary adjacent ABR has failed, thereby maintaining simplicity in the network topology, and minimizing network management and administration requirements.

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International Search Report issued against corresponding International PCT Application No. PCT/CA01/01826, filed Dec. 20, 2001.

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