Prerequisites for Contextual Configuration Diff Utility
The format of the configuration files used for the Contextual Configuration Diff Utility feature must comply with standard Cisco IOS XE configuration file indentation rules as follows:
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Start all commands on a new line with no indentation, unless the command is within a configuration submode.
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Indent commands within a first-level configuration submode one space.
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Indent commands within a second-level configuration submode two spaces.
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Indent commands within subsequent submodes accordingly.
The router must have a contiguous block of memory larger than the combined size of the two configuration files being compared.