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# Changing the Candidate Configuration

To change the candidate configuration on a C Series Controller, a client application encloses the <edit-config> and <target> tag elements and the <candidate/> tag in the <rpc> tag element:

`

    <rpc>
        <edit-config>
            <target>
                <candidate/>
            </target>

       <!- - EITHER - ->
            <config>
                <!- - tag elements representing the configuration elements to change - ->
            </config>
       <!- - OR - ->
            <url>
                <!- - location specifier for file containing changes - ->

            </url>

            <default-operation>(merge | none | replace)</default-operation>
        </edit-config>
    </rpc>
    ]]>]]>

`

The other child tag elements in the preceding syntax statement specify additional parameters, and are described in the indicated sections:

- The <url> or <config> tag element defines the new configuration data to incorporate into the candidate. See Defining the New Configuration Data.
- The <default-operation> tag element specifies the default manner in which the NETCONF server incorporates new configuration data into the candidate configuration. See Setting the Default Mode for Incorporating New Configuration Data.

The NETCONF server confirms that it incorporated the configuration data by returning the <ok/> tag in the <rpc-reply> tag element:

`

    <rpc-reply xmlns="URN" xmlns:sdx="URL">
        <ok/>
    </rpc-reply>
    ]]>]]>

`

If the NETCONF server cannot incorporate the configuration data, the <rpc-reply> tag element instead encloses an <rpc-error> tag element explaining the reason for the failure.

Regardless of the value provided, the NETCONF server for the SRC software performs a basic syntax check on the configuration data in the <edit-config> tag element. It performs a complete syntactic and semantic validation in response to the <commit> tag element (that is, when the configuration is committed),but not in response to the <edit-config> tag element. For information about the <commit> tag element, see Committing Configurations.

The client application can also include the operation attribute in the opening tag for a configuration element to specify the manner in which to incorporate the element, which can differ from the manner specified by the <default-operation> tag element. See Changing Individual Configuration Elements.

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