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diff --git a/GPL/traffic_profiles/trex/trex-stl-3n-ethip4udp-2000u15p.py b/GPL/traffic_profiles/trex/trex-stl-3n-ethip4udp-2000u15p.py
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+++ b/GPL/traffic_profiles/trex/trex-stl-3n-ethip4udp-2000u15p.py
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+# Copyright (c) 2020 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.
+
+"""Stream profile for T-rex traffic generator.
+
+Stream profile:
+ - Two streams sent in directions 0 --> 1 and 1 --> 0 at the same time.
+ - Packet: ETH / IP / UDP
+ - Direction 0 --> 1:
+   - Source IP address range:      20.0.0.0 - 20.0.7.207
+   - Destination IP address range: 12.0.0.2
+   - Source UDP port range:        1024 - 1038
+   - Destination UDP port range:   1024
+ - Direction 1 --> 0:
+   - Source IP address range:      12.0.0.2
+   - Destination IP address range: 200.0.0.0
+   - Source UDP port range:        1024
+   - Destination UDP port range:   1024 - 31022
+"""
+
+from trex.stl.api import *
+from profile_trex_stateless_base_class import TrafficStreamsBaseClass
+
+
+class TrafficStreams(TrafficStreamsBaseClass):
+    """Stream profile."""
+
+    def __init__(self):
+        """Initialization and setting of streams' parameters."""
+
+        super(TrafficStreamsBaseClass, self).__init__()
+
+        # IPs used in packet headers.
+        self.p1_src_start_ip = u"20.0.0.0"
+        self.p1_src_end_ip = u"20.0.7.207"
+        self.p1_dst_start_ip = u"12.0.0.2"
+
+        self.p2_src_start_ip = u"12.0.0.2"
+        self.p2_src_end_ip = u"12.0.0.2"
+        self.p2_dst_start_ip = u"200.0.0.0"
+
+        # UDP ports used in packet headers.
+        self.p1_src_start_udp_port = 1024
+        self.p1_src_end_udp_port = 1038
+        self.p1_dst_start_udp_port = 1024
+
+        self.p2_src_start_udp_port = 1024
+        self.p2_dst_start_udp_port = 1024
+        self.p2_dst_end_udp_port = 31022
+
+    def define_packets(self):
+        """Defines the packets to be sent from the traffic generator.
+
+        Packet definition: | ETH | IP | UDP |
+
+        :returns: Packets to be sent from the traffic generator.
+        :rtype: tuple
+        """
+
+        # Direction 0 --> 1
+        base_pkt_a = (
+            Ether() /
+            IP(
+                src=self.p1_src_start_ip,
+                dst=self.p1_dst_start_ip,
+                proto=17
+            ) /
+            UDP(
+                sport=self.p1_src_start_udp_port,
+                dport=self.p1_dst_start_udp_port
+            )
+        )
+        # Direction 1 --> 0
+        base_pkt_b = (
+            Ether() /
+            IP(
+                src=self.p2_src_start_ip,
+                dst=self.p2_dst_start_ip,
+                proto=17
+            ) /
+            UDP(
+                sport=self.p2_src_start_udp_port,
+                dport=self.p2_dst_start_udp_port
+            )
+        )
+
+        # Direction 0 --> 1
+        vm1 = STLScVmRaw(
+            [
+                STLVmTupleGen(
+                    ip_min=self.p1_src_start_ip,
+                    ip_max=self.p1_src_end_ip,
+                    port_min=self.p1_src_start_udp_port,
+                    port_max=self.p1_src_end_udp_port,
+                    name=u"tuple"
+                ),
+                STLVmWrFlowVar(
+                    fv_name=u"tuple.ip",
+                    pkt_offset=u"IP.src"
+                ),
+                STLVmFixIpv4(
+                    offset=u"IP"
+                ),
+                STLVmWrFlowVar(
+                    fv_name=u"tuple.port",
+                    pkt_offset=u"UDP.sport"
+                )
+            ]
+        )
+        # Direction 0 --> 1
+        vm2 = STLScVmRaw(
+            [
+                STLVmFlowVar(
+                    name=u"dport",
+                    min_value=self.p2_dst_start_udp_port,
+                    max_value=self.p2_dst_end_udp_port,
+                    size=2,
+                    op=u"inc"
+                ),
+                STLVmWrFlowVar(
+                    fv_name=u"dport",
+                    pkt_offset=u"UDP.dport"
+                )
+            ]
+        )
+
+        return base_pkt_a, base_pkt_b, vm1, vm2
+
+
+def register():
+    """Register this traffic profile to T-rex.
+
+    Do not change this function.
+
+    :return: Traffic streams.
+    :rtype: Object
+    """
+    return TrafficStreams()