def _get_system_id(self):
return self.__system_id<EOL>
Getter method for system_id, mapped from YANG variable /network_instances/network_instance/protocols/protocol/isis/levels/level/link_state_database/lsp/tlvs/tlv/extended_is_reachability/neighbors/neighbors/state/system_id (oc-isis-types:system-id)

YANG Description: System-id of the neighbor.