Requesting a Previous (Rollback) Configuration

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>

The Junos XML protocol server encloses its response in <rpc-reply>, <rollback-information>, and <configuration> tag elements. The <load-success/> 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 Requesting Information from the Committed or Candidate Configuration.

<rpc-reply xmlns:junos="URL">
    <rollback-information>
        <load-success/>
        <configuration attributes>
            <!-- tag elements representing the complete previous configuration -->
         </configuration>
    </rollback-information>
</rpc-reply>

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>

The Junos XML protocol server encloses its response in <rpc-reply>, <rollback-information>, <configuration-information>, and <configuration-output> tag elements. For more information about how ASCII output is formatted, see Requesting Output as Formatted ASCII Text or Junos XML Tag Elements.

<rpc-reply xmlns:junos="URL">
    <rollback-information>
        <load-success/>
        <configuration-information>
            <configuration-output>
                <!-- formatted ASCII text for the complete previous configuration -->
            </configuration-output>
        </configuration-information>
    </rollback-information>
</rpc-reply>

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 10.3R1 for the initial version of Junos OS Release 10.3.