Basic Clear ANC Endpoint Policy by MAC Address Example

This sample clears a Cisco Adaptive Network Control (ANC) policy from an endpoint via DXL and Cisco pxGrid. The sample identifies the endpoint by its MAC address.

Prerequisites

• The samples configuration step has been completed (see Samples Configuration).
• The DXL fabric to which the client will connect has been bridged to Cisco pxGrid.
• The Python client has been authorized to perform DXL Cisco pxGrid Queries (see Authorize Client to Use Cisco pxGrid via DXL).
• Run through the steps in the Basic Apply ANC Endpoint Policy by MAC Address Example to apply a policy to an endpoint. A run of this example can then clear the policy.

Configuration

Update the following line in the sample:

HOST_MAC = "<SPECIFY_MAC_ADDRESS>"

To specify the MAC address of a endpoint for which to clear the policy. For example:

HOST_MAC = "00:11:22:33:44:55"

Running

To run this sample execute the sample/basic/basic_anc_clear_endpoint_policy_by_mac_example.py script as follows:

python sample/basic/basic_anc_clear_endpoint_policy_by_mac_example.py

If the policy can be cleared successfully, the output should appear similar to the following:

{
    "ancStatus": "success"
}

The received results are displayed.

If no policy has been associated with the endpoint before the example is run, an Exception is raised and output similar to the following should appear:

Error: mac address is not associated with a policy error associated with mac 00:11:22:33:44:55 (0)

Details

The majority of the sample code is shown below:

# MAC address of the endpoint for which to clear the policy
HOST_MAC = "<SPECIFY_MAC_ADDRESS>"

# Create the client
with DxlClient(config) as dxl_client:

    # Connect to the fabric
    dxl_client.connect()

    logger.info("Connected to DXL fabric.")

    # Create client wrapper
    client = CiscoPxGridClient(dxl_client)

    try:
        # Invoke 'clear endpoint policy by MAC' method on service
        resp_dict = client.anc.clear_endpoint_policy_by_mac(HOST_MAC)

        # Print out the response (convert dictionary to JSON for pretty
        # printing)
        print("Response:\n{0}".format(
            MessageUtils.dict_to_json(resp_dict, pretty_print=True)))
    except Exception as ex:
        # An exception would be raised if a policy has not already been
        # associated with the endpoint.
        print(str(ex))

Once a connection is established to the DXL fabric, a dxlciscopxgridclient.client.CiscoPxGridClient instance is created which will be used to communicate with Cisco pxGrid.

Next, the dxlciscopxgridclient.client.AncClientCategory.clear_endpoint_policy_by_mac() method is invoked with the MAC address of the endpoint for which to clear the policy.

The final step is to display the contents of the returned dictionary (dict) which contains the results of the attempt to clear the policy from the endpoint.