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Comparing Two Previous (Rollback) Configurations Using NETCONF

 

In a NETCONF session with a device running Junos OS, to compare the contents of two previously committed (rollback) configurations, a client application emits the Junos XML <get-rollback-information> tag element and its child <rollback> and <compare> tag elements in an <rpc> tag element. This operation is equivalent to the show system rollback operational mode command with the compare option.

The <rollback> tag element specifies the index number of the configuration that is the basis for comparison. The <compare> tag element specifies the index number of the configuration to compare with the base configuration. Valid values in both tag elements range from 0 (zero, for the most recently committed configuration) through 49:

Note

The output corresponds more logically to the chronological order of changes if the older configuration (the one with the higher index number) is the base configuration. Its index number is enclosed in the <rollback> tag element and the index of the more recent configuration is enclosed in the <compare> tag element.

The NETCONF server encloses its response in <rpc-reply>, <rollback-information>, <configuration-information>, and <configuration-output> tag elements. The <ok/> tag is a side effect of the implementation and does not affect the results.

The information in the <configuration-output> tag element is formatted ASCII and includes a banner line (such as [edit interfaces]) for each hierarchy level at which the two configurations differ. Each line between banner lines begins with either a plus sign (+) or a minus sign (–). The plus sign indicates that adding the statement to the base configuration results in the second configuration, whereas a minus sign means that removing the statement from the base configuration results in the second configuration.

The following example shows how to request a comparison of the rollback configurations that have indexes of 20 and 4.