| US 7,489,642 B2 | ||
| Silent datapath failure detection | ||
| Desmond Glenn Smith, Kanata (Canada); Terrence Vincent Sellars, Kanata (Canada); Stephen Michael Shortt, Carp (Canada); David Henry Graham, Kanata (Canada); Christopher Edward Trader, Ottawa (Canada); Myles Kevin Dear, Nepean (Canada); and Thomas Man Chun Kam, Stittsville (Canada) | ||
| Assigned to Alcatel Lucent, Paris (France) | ||
| Filed on Apr. 29, 2004, as Appl. No. 10/834,129. | ||
| Prior Publication US 2005/0243731 A1, Nov. 03, 2005 | ||
| Int. Cl. H04L 12/26 (2006.01) | ||
| U.S. Cl. 370—242 [370/252] | 39 Claims |
| 1. In a switched communication network that enables establishing a datapath over a switching node of said network, an apparatus
for silent datapath failure detection at said node comprising:
at an ingress of said node associated with said datapath, an ingress statistics unit for collecting an ingress protocol data
unit (PDU) count over a time interval;
at an egress of said node associated with said datapath, an egress statistics unit for collecting an egress PDU count over
said time interval;
means for comparing said ingress PDU count and said egress PDU count and generating an error signal in case of a mismatch
between said ingress PDU count and said egress PDU count;
means for alarming said mismatch and specifying a type of datapath failure associated with said error signal; and
a decision unit for comprising said egress PDU count with a threshold, and whenever said egress PDU count violates said threshold,
identifying said ingress, PDU count corresponding to said ingress triggering said means for comparing, and using an additional
threshold for distinguishing linecard resets from a datapath failure.
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