Method of port/link redundancy in an ATM switch

Details Method of port/link redundancy in an ATM switch Method of port/link redundancy in an ATM switch

1997-05-27

1999-09-28

Pham, Chi H.

Multiplex communications

Fault recovery

Bypass an inoperative channel

370244, 370395, H04L 1226, H04M 324

Patent

active

059599723

ABSTRACT:
A method for implementing redundancy of both links and ports between two switches, e.g., ATM switches. A redundant link connection between two ATM switches is constructed using two separate parallel communication links connected between separate ports on each of the switches. One communication link is termed the main link and the other is termed the backup link. Two virtual circuits are setup between the backup link ports. One is a direct virtual circuit directed over the backup link. The other is an indirect virtual circuit that is routed over the main link via the main link ports. A virtual circuit is also setup over the main link for regular data traffic. In addition, a standby virtual circuit is setup over the backup link but is placed in standby until the occurrence of a failure. Until a failure occurs, traffic normally proceeds over the main link while the backup link ports transmit keep alive messages to each other over the indirect virtual circuit that is routed over the main link. When the main link fails, either one or both of the backup link ports detects the failure. The data traffic is then switched from the main link to the backup link. The failure is detected by the failure of the backup link ports to receive keep alive messages.

REFERENCES:
patent: 5239537 (1993-08-01), Sakauchi
patent: 5398236 (1995-03-01), Hemmady et al.
patent: 5420861 (1995-05-01), De La Bourdonnaye
patent: 5436886 (1995-07-01), Mcgill
patent: 5715237 (1998-02-01), Akiyoshi
Fritz, J., "Bulletproofing ATM: Part I", Byte, Jun. 1997, pp. 59-60.

Affiliated with

Also associated with

Rating

Method of port/link redundancy in an ATM switch does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of port/link redundancy in an ATM switch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of port/link redundancy in an ATM switch will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-711833