|  | The options  'no-autonomous-flag', 'no-on-link-flag', 'preferred-lifetime', and 'valid-lifetime' are available while configuring the prefix for router-advert service. If these options are not specifically configured, then its takes the default ones.
                'autonomous_flag' : 'on',
                'on_link' : 'on',
                'preferred_lifetime': 14400,
                'valid_lifetime' : 2592000 |