Google Inc.

Alan Tang

Hui Liu

Gargi Adhav

Hongkun Yang

A method includes obtaining a stream of consecutive network configuration snapshots each including network configuration information. The method also includes determining that first network configuration information is the same as second network configuration information. After determining that the first network configuration information is the same as the second network configuration information, the method includes determining that the second network configuration information is not the same as third network configuration information. The method also includes determining a net change in reachability for a network based on a difference in packet reachability. The method also includes determining a policy violation based on the net change in reachability for the network and generating a reachability differentiation report including the policy violation. The method also includes reverting a configuration of the network to a state corresponding to the first network configuration information and implementing the network using the reverted configuration.

Network reachability impact analysis

A method includes receiving a plurality of network configuration snapshots for a network and determining whether a first data plane model protocol of a first snapshot is the same as a second data plane model protocol of a second snapshot consecutive with the first snapshot. When the snapshots are the same, the method includes determining whether a third snapshot is the same as the second snapshot. When the snapshots are different, the method includes selecting the first snapshot and the second snapshot. The method includes generating a first reachability graph representing packet reachability of the network for the first snapshot and generating a second reachability graph representing packet reachability of the network for the second snapshot. The method includes computing a reachability differentiation graph identifying a net change to reachability from the first reachability graph to the second reachability graph and generating a report of the net change to reachability.

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Los Angeles, CA, United States of America

Alan Tang