Cisco Technology, Inc.

Jonathan D Cohn

Somnath Mitra

Methods and apparatus for identifying sequence mismatch defects associated with members of a virtual concatenation (VCAT) group are disclosed. According to one aspect of the present invention, a method for detecting sequence mismatch defects associated with a VCAT group that substantially terminates at a VCAT sink includes obtaining a first set of sequence numbers associated with the VCAT group at a first time, and determining whether a first sequence number of the first set is invalid. The method also includes identifying the first sequence number as having a sequence mismatch defect if the first sequence number is determined to be invalid.

Virtual concatenation sequence mismatch defect detection

A router may induce a reflected interrupt to indicate to a processor in the router to execute encryption or decryption commands on packets in an input queue. The reflected interrupt may have a lower priority than interrupts generated for the processing of time-critical packets. This prevents starvation of potentially important packets while still providing for the security of a critical section for encryption and decryption commands. The router may also be designed to detect when a predefined event occurs and stop the execution of encryption or decryption commands accordingly. This is especially useful for preventing the starvation of lower priority packets, as the encryption or decryption processing loop may be stopped intermittently to allow the processor to perform other tasks. Scheduling of the encryption or decryption process may also help prevent traffic-related problems.

Reflected interrupt for hardware-based encryption

An apparatus and method for supporting enhanced ring scheduling for devices on platforms with limited power supply while seeking to preserve caller ID information and normal ringing cadence is disclosed. The ring scheduling apparatus includes a &ldquo;Line Manager&rdquo; coupled to a &ldquo;Ring Scheduler&rdquo;. The Line manager monitors the signaling events and determines whether the signaling commands associated with the signaling events should be modified to indicate ringing, no ringing, or pass the signaling commands unmodified. The &ldquo;Ring Scheduler&rdquo; manages the available resources according to a ring cadence schedule so that the power supply of the device is not exceeded.

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Novato, CA, United States of America

Jonathan D Cohn