Cisco Technology, Inc.

Zachary Seils

Arivu Mani Ramasamy

Martin Cieslak

Swaminathan Sankar

Giorgio Valentini

Natarajan Chidambaram

Abdolreza Saadat

Deepak S Khanorkar

Techniques are provided to detect and correct for packet loops associated with network traffic that passes through a wide-area application services (WAAS) device in a data center network environment. The WAAS device receives a packet from a device in a first data center. The WAAS device determines the directionality of the packet relative to a destination device of the packet. The WAAS device also determines whether the packet has an indicator that associates the packet with the WAAS device. Based on whether the packet has an indicator that associates the packet with the wide area application services device, the WAAS device inserts an indicator within the packet when the directionality of the packet indicates that the packet is to be transmitted across a wide area network (WAN), wherein the indicator comprises information that associates the packet with the WAAS device. The WAAS device forwards the packet to a network based on its directionality.

Wide-area application services device to determine packet loop errors in a data center that communicates over a wide area network

In one embodiment a method includes detecting, at a first Wide Area Network (WAN) device deployed at an edge of a WAN, a packet passing through the first WAN device and departing a node with which the first WAN device is associated for another node connected to the WAN, identifying, by the first WAN device, a network destination address to which the packet is addressed, obtaining from memory accessible to the first WAN device an identifier of another WAN device associated with the network destination address, and marking the packet with the identifier to generate a marked packet. The marked packet is then received by a WAN device, which detects the identifier, and passes the marked packet to the identified WAN device. In an embodiment, the WAN device associated with the network destination address is a WAN device that first detects a synchronization-acknowledgement (SYN-ACK) packet.

Controlling directional asymmetricity in wide area networks

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Austin, TX, United States of America

Zachary Seils