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diff --git a/resources/libraries/python/TRexConfigGenerator.py b/resources/libraries/python/TRexConfigGenerator.py
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+++ b/resources/libraries/python/TRexConfigGenerator.py
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+# Copyright (c) 2023 Cisco and/or its affiliates.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""TRex Configuration File Generator library."""
+
+import re
+import yaml
+
+from resources.libraries.python.Constants import Constants
+from resources.libraries.python.CpuUtils import CpuUtils
+from resources.libraries.python.ssh import exec_cmd_no_error
+from resources.libraries.python.topology import NodeType, NodeSubTypeTG
+from resources.libraries.python.topology import Topology
+
+
+__all__ = ["TrexConfigGenerator", "TrexInitConfig"]
+
+def pci_dev_check(pci_dev):
+    """Check if provided PCI address is in correct format.
+
+    :param pci_dev: PCI address (expected format: xxxx:xx:xx.x).
+    :type pci_dev: str
+    :returns: True if PCI address is in correct format.
+    :rtype: bool
+    :raises ValueError: If PCI address is in incorrect format.
+    """
+    pattern = re.compile(
+        r"^[0-9A-Fa-f]{4}:[0-9A-Fa-f]{2}:[0-9A-Fa-f]{2}\.[0-9A-Fa-f]$"
+    )
+    if not re.match(pattern, pci_dev):
+        raise ValueError(
+            f"PCI address {pci_dev} is not in valid format xxxx:xx:xx.x"
+        )
+    return True
+
+
+class TrexConfigGenerator:
+    """TRex Startup Configuration File Generator."""
+
+    def __init__(self):
+        """Initialize library.
+        """
+        self._node = ""
+        self._node_key = ""
+        self._node_config = dict()
+        self._node_serialized_config = ""
+        self._startup_configuration_path = "/etc/trex_cfg.yaml"
+
+    def set_node(self, node, node_key=None):
+        """Set topology node.
+
+        :param node: Node to store configuration on.
+        :param node_key: Topology node key.
+        :type node: dict
+        :type node_key: str
+        :raises RuntimeError: If Node type is not TG and subtype is not TREX.
+        """
+        if node.get("type") is None:
+            msg = "Node type is not defined!"
+        elif node["type"] != NodeType.TG:
+            msg = f"Node type is {node['type']!r}, not a TG!"
+        elif node.get("subtype") is None:
+            msg = "TG subtype is not defined"
+        elif node["subtype"] != NodeSubTypeTG.TREX:
+            msg = f"TG subtype {node['subtype']!r} is not supported"
+        else:
+            self._node = node
+            self._node_key = node_key
+            return
+        raise RuntimeError(msg)
+
+    def get_serialized_config(self):
+        """Get serialized startup configuration in YAML format.
+
+        :returns: Startup configuration in YAML format.
+        :rtype: str
+        """
+        self.serialize_config(self._node_config)
+        return self._node_serialized_config
+
+    def serialize_config(self, obj):
+        """Serialize the startup configuration in YAML format.
+
+        :param obj: Python Object to print.
+        :type obj: Obj
+        """
+        self._node_serialized_config = yaml.dump([obj], default_style=None)
+
+    def add_config_item(self, config, value, path):
+        """Add startup configuration item.
+
+        :param config: Startup configuration of node.
+        :param value: Value to insert.
+        :param path: Path where to insert item.
+        :type config: dict
+        :type value: str
+        :type path: list
+        """
+        if len(path) == 1:
+            config[path[0]] = value
+            return
+        if path[0] not in config:
+            config[path[0]] = dict()
+        elif isinstance(config[path[0]], str):
+            config[path[0]] = dict() if config[path[0]] == "" \
+                else {config[path[0]]: ""}
+        self.add_config_item(config[path[0]], value, path[1:])
+
+    def add_version(self, value=2):
+        """Add config file version.
+
+        :param value: Version of configuration file.
+        :type value: int
+        """
+        path = ["version"]
+        self.add_config_item(self._node_config, value, path)
+
+    def add_c(self, value):
+        """Add core count.
+
+        :param value: Core count.
+        :type value: int
+        """
+        path = ["c"]
+        self.add_config_item(self._node_config, value, path)
+
+    def add_limit_memory(self, value):
+        """Add memory limit.
+
+        :param value: Memory limit.
+        :type value: str
+        """
+        path = ["limit_memory"]
+        self.add_config_item(self._node_config, value, path)
+
+    def add_interfaces(self, devices):
+        """Add PCI device configuration.
+
+        :param devices: PCI device(s) (format xxxx:xx:xx.x).
+        :type devices: list(str)
+        """
+        for device in devices:
+            pci_dev_check(device)
+
+        path = ["interfaces"]
+        self.add_config_item(self._node_config, devices, path)
+
+    def add_rx_desc(self, value):
+        """Add RX descriptors.
+
+        :param value: RX descriptors count.
+        :type value: int
+        """
+        path = ["rx_desc"]
+        self.add_config_item(self._node_config, value, path)
+
+    def add_tx_desc(self, value):
+        """Add TX descriptors.
+
+        :param value: TX descriptors count.
+        :type value: int
+        """
+        path = ["tx_desc"]
+        self.add_config_item(self._node_config, value, path)
+
+    def add_port_info(self, value):
+        """Add port information configuration.
+
+        :param value: Port information configuration.
+        :type value: list(dict)
+        """
+        path = ["port_info"]
+        self.add_config_item(self._node_config, value, path)
+
+    def add_platform_master_thread_id(self, value):
+        """Add platform master thread ID.
+
+        :param value: Master thread ID.
+        :type value: int
+        """
+        path = ["platform", "master_thread_id"]
+        self.add_config_item(self._node_config, value, path)
+
+    def add_platform_latency_thread_id(self, value):
+        """Add platform latency thread ID.
+
+        :param value: Latency thread ID.
+        :type value: int
+        """
+        path = ["platform", "latency_thread_id"]
+        self.add_config_item(self._node_config, value, path)
+
+    def add_platform_dual_if(self, value):
+        """Add platform dual interface configuration.
+
+        :param value: Dual interface configuration.
+        :type value: list(dict)
+        """
+        path = ["platform", "dual_if"]
+        self.add_config_item(self._node_config, value, path)
+
+    def write_config(self, path=None):
+        """Generate and write TRex startup configuration to file.
+
+        :param path: Override startup configuration path.
+        :type path: str
+        """
+        self.serialize_config(self._node_config)
+
+        if path is None:
+            path = self._startup_configuration_path
+
+        command = f"echo \"{self._node_serialized_config}\" | sudo tee {path}"
+        message = "Writing TRex startup configuration failed!"
+        exec_cmd_no_error(self._node, command, message=message)
+
+
+class TrexInitConfig:
+    """TRex Initial Configuration.
+    """
+    @staticmethod
+    def init_trex_startup_configuration(node, tg_topology):
+        """Apply initial TRex startup configuration.
+
+        :param node: TRex node in the topology.
+        :param tg_topology: Ordered TRex links.
+        :type node: dict
+        :type tg_topology: list(dict)
+        """
+        pci_addresses = list()
+        dual_if = list()
+        port_info = list()
+        master_thread_id = None
+        latency_thread_id = None
+        cores = None
+        limit_memory = f"{Constants.TREX_LIMIT_MEMORY}"
+        sockets = 0
+
+        for link in tg_topology:
+            pci_addresses.append(
+                Topology().get_interface_pci_addr(node, link["interface"])
+            )
+            master_thread_id, latency_thread_id, socket, threads = \
+                CpuUtils.get_affinity_trex(
+                    node, link["interface"], tg_dtc=Constants.TREX_CORE_COUNT
+                )
+            dual_if.append(dict(socket=socket, threads=threads))
+            cores = len(threads)
+            port_info.append(
+                dict(
+                    src_mac=Topology().get_interface_mac(
+                        node, link["interface"]
+                    ),
+                    dst_mac=link["dst_mac"]
+                )
+            )
+            sockets = sockets | socket
+        if sockets:
+            limit_memory = (
+                f"{Constants.TREX_LIMIT_MEMORY},{Constants.TREX_LIMIT_MEMORY}"
+            )
+
+        trex_config = TrexConfigGenerator()
+        trex_config.set_node(node)
+        trex_config.add_version()
+        trex_config.add_interfaces(pci_addresses)
+        trex_config.add_c(cores)
+        trex_config.add_limit_memory(limit_memory)
+        trex_config.add_port_info(port_info)
+        if Constants.TREX_RX_DESCRIPTORS_COUNT != 0:
+            trex_config.add_rx_desc(Constants.TREX_RX_DESCRIPTORS_COUNT)
+        if Constants.TREX_TX_DESCRIPTORS_COUNT != 0:
+            trex_config.add_rx_desc(Constants.TREX_TX_DESCRIPTORS_COUNT)
+        trex_config.add_platform_master_thread_id(int(master_thread_id))
+        trex_config.add_platform_latency_thread_id(int(latency_thread_id))
+        trex_config.add_platform_dual_if(dual_if)
+        trex_config.write_config()