US 6,982,958 B2 | ||
Method for transmitting loopback cells through a switching node of an asynchronous transfer mode (ATM) network | ||
Jose Iruela, St Laurent du Var (France); Daniel Orsatti, LaGaude (France); Bruno Rene Rousseau, Vence (France); Dominique Rigal, Nice (France); and Jean Claude Zunino, Nice (France) | ||
Assigned to International Business Machines Corporation, Armonk, N.Y. (US) | ||
Filed on Jan. 03, 2001, as Appl. No. 9/753,931. | ||
Claims priority of application No. 00480022 (EP), filed on Feb. 22, 2000. | ||
Prior Publication US 2001/0015959 A1, Aug. 23, 2001 | ||
Int. Cl. H04L 12/56 (2006.01) |
U.S. Cl. 370—236 | 5 Claims |
1. A system for transmitting a loopback cell within a switching node of an ATM connection, said switching node including a
first adapter having associated ports and a second adapter having associated ports, wherein said loopback cell enters said
switching node by a first adapter port, said system comprising:
processing means within said switching node for detecting a loopback condition when an ATM cell enters said first adapter;
a routing header function for appending a routing label to said ATM cell indicating that said ATM cell is a loopback cell
to be looped back on said ATM connection, said routing label being appended to said loopback cell only if a loop control bit
is set by a control point of said switching node within said first adapter, and
a switching engine for transferring said loopback cell to said first adapter port utilizing said appended routing label.
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