Multiring control method, node using the method, and control...

Details Multiring control method, node using the method, and control... Multiring control method, node using the method, and control...

2008-01-29

2008-01-29

Patel, Ajit (Department: 2616)

Multiplex communications

Fault recovery

Bypass an inoperative station

C370S221000

Reexamination Certificate

active

10359133

ABSTRACT:
The invention enables protection of a ring frame transferred via an inter-ring bridge ring node when a fault occurs at the node in a multiring. Ring nodes form a ring protection domain to enable one ring node to be bypassed by using other ring nodes when a fault occurs at this ring node. The TTL value of ring frame to be transferred through the bypass is set to a value obtained by adding the number of hops h to the faulty ring node to a common initial value A in the same two-fiber ring to enable detection of a characteristic TTL value at a bypassing ring node. The bypass fur the ring frame is selected with reference to the characteristic TTL value at the bypassing ring node.

REFERENCES:
patent: 6147970 (2000-11-01), Troxel
patent: 6185210 (2001-02-01), Troxel
patent: 07-264223 (1995-10-01), None
patent: 2000-004248 (2000-01-01), None
patent: 2002-319973 (2002-10-01), None
D. Tsiang et al., RFC 2892 The Cisco SRP Mac Layer Protocol, Aug. 2000.

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