Ciena Corporation

Cisco Technology, Inc.

Mahesh Jethanandani

Ashesh Mishra

Ankur Saxena

Keyur Patel

Brian Eliot Weis

Abhijit Patra

Nagaraj Bagepalli

Murali Bashyam

Anantha Ramaiah

David Wei-Shen Chang

Sowmya Chandran

A method and network element include receiving, at a receiver node, at least one of sender timestamps and sequence numbers in continuity check (CC) frames sent by a sender node; determining receiver timestamps at the receiver node; detecting instability based on one or more of the at least one of sender timestamps and sequence numbers and the receiver timestamps; and performing a remedial action based on the detecting instability. The CC frames can include Bidirectional Forwarding Detection (BFD) or Continuity Check Message (CCM) frames which are regularly transmitted in a session, but do not currently include timestamps or sequence numbers.

Systems and methods for collecting and analyzing data to determine link quality and stability in layer two networks

A method, a network element, and a network include determining an authentication mechanism between two nodes in a network path; operating the network path; performing connectivity check between the two nodes in the network path; and authenticating specific frames in the connectivity check between the two nodes with the authentication mechanism responsive to the specific frames affecting a state of the network path. The frames can be Bidirectional Forwarding Detection (BFD), Continuity Check Messages (CCMs), etc. Advantageously, the method, network element, and network reduce the computational load of providing authentication while maintaining secure authentication for important frames, i.e., ones that affect the state of the network path.

Integrity check optimization systems and methods in live connectivity frames

Methods and apparatus for optimizing fault synchronization in a bidirectional data network are provided. In an example, a downstream endpoint of the data network receives a first Alarm Indication Signal (AIS). The first AIS indicates a first FLI of an upstream interface having an interface fault. The downstream endpoint transmits, to an upstream endpoint of the data network, a second AIS including a Remote Defect Indication (RDI) and a second FLI identifying the downstream endpoint. An upstream endpoint of the data network receives the second AIS and determines that the AIS is an AIS-RDI (AIS-RDI) from the presence of the second FLI. The presence of the AIS-RDI triggers the upstream endpoint to initiate tunnel failure synchronization with the downstream endpoint.

Optimizing fault synchronization in a bidirectional data network

In an embodiment, a method comprises establishing a first data communications session with a first router. In response to receiving a first request to establish a second data communications session, a probe message that is configured to test whether the first data communications session or the first router is responsive is sent to the first router. In response to determining that the first router has not acknowledged the probe message before a probe timer has expired, and receiving a second request to establish the second data communications session, the second data communications session with the first router is established and a state for the first data communications session is deleted.

Restarting network reachability protocol sessions based on transport layer authentication

Systems and procedures are presented for communicating multiple data streams through an SSLVPN gateway. One implementation of a method includes receiving a plurality of incoming data streams and load balancing the incoming data streams. The load balancing includes assigning a first set of one or more incoming data streams to a first subprocessor, and responding to the first set of incoming data streams with outgoing data streams that include a first identifier that indicates the first subprocessor. One implementation of a network element includes a plurality of subprocessors and a dispatcher module. The dispatcher module is coupled to the plurality of subprocessors, and is configured to recognize an identifier in a received data stream. The dispatcher module dispatches the received data stream to a corresponding subprocessor of the plurality of processors in response to the identifier in the received data stream.

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Saratoga, CA, United States of America

Mahesh Jethanandani