+ @staticmethod
+ def get_interface_mac_from_json(interface_dump_json, sw_if_index):
+ """Get interface MAC address from given JSON output by sw_if_index.
+
+ :param interface_dump_json: JSON output from dump_interface_list VAT
+ command.
+ :param sw_if_index: SW interface index.
+ :type interface_dump_json: str
+ :type sw_if_index: int
+ :returns: Interface MAC address.
+ :rtype: str
+ :raises ValueError: If interface not found in interface_dump_json.
+ """
+ logger.trace(interface_dump_json)
+ interface_list = JsonParser().parse_data(interface_dump_json)
+ for interface in interface_list:
+ try:
+ if interface['sw_if_index'] == sw_if_index:
+ mac_from_json = interface['l2_address'][:6] \
+ if 'l2_address' in interface.keys() else ''
+ mac_address = ':'.join('{:02x}'.format(item)
+ for item in mac_from_json)
+ logger.debug('Interface with sw_if_index {idx} has MAC'
+ ' address {addr}.'.format(idx=sw_if_index,
+ addr=mac_address))
+ return mac_address
+ except KeyError:
+ pass
+ raise ValueError('Interface with sw_if_index {idx} not found.'
+ .format(idx=sw_if_index))
+