Juniper Networks, Inc.

Shine-Chu Wang

Rajagopalan Sivaramakrishnan

James Michael Murphy

Abhijit Kumar Choudhury

Sandip K Shah

Raghavendra Mallya

Pranay Pogde

Yung-Ching Tseng

Ileana J Membreno

Sandeep Kumar

Umesh Krishnaswamy

Bharani Chadalavada

Raj Tuplur

Raghunath Balakrishna

Joel Abraham Obstfeld

Mu Lin

Hui Qu

Zi Zhou

Heng-Hui Debbie Chu

Leyi Zhang

In some embodiments, an apparatus includes a first controller configured to be operatively coupled within a network having a set of network nodes, a forwarding gateway and a configuration entity. The first controller is configured to manage session state and node state associated with the set of network nodes independent of the forwarding gateway. The first controller is configured to fail over to a second controller when the first controller fails, without the forwarding gateway failing over and without the configuration entity failing over.

Methods and apparatus for scalable resilient networks

Techniques are described for providing high availability for a network device, e.g., a router, using full memory replication between a primary virtual machine (VM) and a standby VM running on the network device. In one example, the techniques provide hot-standby high availability for a router by initializing a primary VM and a standby VM on the router at the same time. In another example, the techniques provide high availability for the router by initializing a standby VM on the router upon detecting a failure of the primary VM. In both examples, the primary VM controls the routing functionality and periodically stores a full memory state. Upon a failure of the primary VM, a hypervisor may perform a full memory replication between the primary VM and the standby VM. The standby VM may then take control of the routing functionality at the last stored state of the memory.

High availability using full memory replication between virtual machine instances on a network device

Techniques are described for synchronizing state information between a plurality of control units. A router, for example, is described that includes a primary control unit and a standby control unit. The primary control unit maintains router resources to ensure operation of the router. To ensure operation, the primary control unit receives state information from the router resources and maintains the state information for consumers, i.e. router resources that require or 'consume' state information. Prior to updating the consumers with the state information, the primary control unit synchronizes the state information with the standby control unit. In the event the primary control unit fails, the standby control unit assumes control of the router resources. Upon assuming control, the standby control unit resumes updating the consumers with state information without having to 'relearn' state information, e.g., by way of power cycling the router resources to a known state.

Synchronizing state information between control units

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Sunnyvale, CA, United States of America

Shine-Chu Wang