Verification mechanism for network service chain paths
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United States of America Patent
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Apr 28, 2020
Grant Date -
Nov 30, 2017
app pub date -
May 28, 2016
filing date -
May 28, 2016
priority date (Note) -
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Abstract
Data packets passing from a source to a destination in a network according to a Service Function Chain (SFC) are processed by an ordered sequence of at least one service function (SF). For each SF in the SFC in order, a current value of a function, such as a hash function, is recursively computed including, as input values, at least current identifying data that identifies a corresponding current one of the SFs, and a value of the function output from an immediately preceding SF. After computing the current value of the function for a selected SF in the SFC, the current value of the function is compared with an expected value. If the value of the function for the selected SF is the same as the expected value, the data packet is allowed to be transmitted to a subsequent processing stage; if not, then an error response action is taken.
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