FINDING LATENCY THROUGH A PHYSICAL NETWORK IN A VIRTUALIZED NETWORK

摘要

Techniques are described for determining latency in a physical network that includes a number of network devices over which packets travel. A virtual network controller receives a plurality of messages from a plurality of network devices in a network, each of the messages including a packet signature comprising a hash of an invariant portion of an original packet that uniquely identifies the original packet, an identifier of one of the plurality of network devices from which the respective message was received, and a timestamp indicating a time an original packet was processed by the network device from which the respective message was received. The virtual network controller determines a latency of a physical network path in the network based on analysis of contents of the identified messages having a common packet signature.

主权项

1. A method comprising:
receiving, from a virtual network controller, by a network device having a virtual network agent and a virtual network switch of a plurality of interconnected virtual network switches connected to the virtual network controller by an overlay network, information specifying packet characteristics of packets to be analyzed and a time period during which to apply the packet characteristics; in response determining that a time the information is received is later than the time period during which to apply the packet characteristics, ignoring, by the virtual network agent, the received information; and in response to determining that the time period during which to apply the packet characteristics has not passed:
installing, by the virtual network agent and based on the information, a packet classifier to the virtual network switch;responsive to determining that a received packet matches the specified characteristics, by the virtual network agent, determining a hash of an invariant portion of the packet that uniquely identifies the packet to obtain a packet signature; andforwarding, to the virtual network controller, a message that specifies: (1) the packet signature, (2) an identifier of the network device, and (3) a timestamp indicating a time the packet was processed by the network device.