Retrieve a Previous (Rollback) Configuration Using NETCONF

In a NETCONF session with a device running Junos OS, to request a previously committed (rollback) configuration, a client application emits the Junos XML <get-rollback-information> tag element and its child <rollback> tag element in an <rpc> tag element. This operation is equivalent to the show system rollback operational mode command. The <rollback> tag element specifies the index number of the previous configuration to display; its value can be from 0 (zero, for the most recently committed configuration) through 49.

To request Junos XML-tagged output, the application either includes the <format> tag element with the value xml or omits the <format> tag element (Junos XML tag elements are the default):

<rpc>
    <get-rollback-information>
        <rollback>index-number</rollback>
    </get-rollback-information>
</rpc>
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The NETCONF server encloses its response in <rpc-reply>, <rollback-information>, and <configuration> tag elements. The <ok/> tag is a side effect of the implementation and does not affect the results. For information about the attributes in the opening <configuration> tag, see Specify the Source for Configuration Information Requests Using NETCONF.

<rpc-reply xmlns="URN" xmlns:junos="URL">
    <rollback-information>
        <ok/>
        <configuration attributes>
           <!-- tag elements representing the complete previous configuration -->
        </configuration>
    </rollback-information>
</rpc-reply>
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To request formatted ASCII output, the application includes the <format> tag element with the value text.

<rpc>
    <get-rollback-information>
        <rollback>index-number</rollback>
        <format>text</format>
    </get-rollback-information>
</rpc>
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The NETCONF server encloses its response in <rpc-reply>, <rollback-information>, <configuration-information>, and <configuration-output> tag elements. For more information about the formatted ASCII notation used in Junos OS configuration statements, see the CLI User Guide.

<rpc-reply xmlns="URN" xmlns:junos="URL">
    <rollback-information>
        <ok/>
        <configuration-information>
            <configuration-output>
                    /* previous configuration in formatted ASCII*/
            </configuration-output>
        </configuration-information>
    </rollback-information>
</rpc-reply>
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Starting in Junos OS Release 16.1, to request a previously committed (rollback) configuration in JSON format, the application includes the <format> tag element with the value json in the <get-rollback-information> element. Prior to Junos OS Release 16.1, JSON-formatted data is requested by including the format="json" attribute in the opening <get-rollback-information> tag.

<rpc>
    <get-rollback-information>
        <rollback>index-number</rollback> 
        <format>json</format>
    </get-rollback-information>
</rpc>
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When you use the format="json" attribute to specify the format, the NETCONF server encloses its response in an <rpc-reply> element, the field name for the top-level JSON member is "rollback-information", and the emitted configuration data uses an older implementation for serialization. When you use the <format>json</format> element to request JSON-formatted data, the NETCONF server encloses its response in <rpc-reply>, <rollback-information>, <configuration-information>, and <json-output> tag elements, the field name for the top-level JSON member is "configuration", and the emitted configuration data uses a newer implementation for serialization.

<rpc-reply xmlns="URN" xmlns:junos="URL">
    <rollback-information>
        <ok/>
        <configuration-information>
            <json-output>
                <!-- JSON data for the complete previous configuration -->
            </json-output>
        </configuration-information>
    </rollback-information>
</rpc-reply>
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The following example shows how to request Junos XML-tagged output for the rollback configuration that has an index of 2. In actual output, the Junos-version variable is replaced by a value such as 20.4R1 for the initial version of Junos OS Release 20.4.