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diff --git a/resources/traffic_profiles/trex/trex-sl-3n-ethip6-ip6src253.py b/resources/traffic_profiles/trex/trex-sl-3n-ethip6-ip6src253.py
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+++ b/resources/traffic_profiles/trex/trex-sl-3n-ethip6-ip6src253.py
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+# Copyright (c) 2017 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 / IPv6 /
+ - Direction 0 --> 1:
+   - Source IP address range:      2001:1::2 - 2001:1::FE
+   - Destination IP address range: 2001:2::2
+ - Direction 1 --> 0:
+   - Source IP address range:      2001:2::2 - 2001:2::FE
+   - Destination IP address range: 2001:1::2
+"""
+
+from trex_stl_lib.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 = '2001:1::2'
+        self.p1_src_end_ip = '2001:1::FE'
+        self.p1_dst_start_ip = '2001:2::2'
+
+        self.p2_src_start_ip = '2001:2::2'
+        self.p2_src_end_ip = '2001:2::FE'
+        self.p2_dst_start_ip = '2001:1::2'
+
+    def define_packets(self):
+        """Defines the packets to be sent from the traffic generator.
+
+        Packet definition: | ETH | IPv6 |
+
+        :returns: Packets to be sent from the traffic generator.
+        :rtype: tuple
+        """
+
+        base_p1, count_p1 = self._get_start_end_ipv6(self.p1_src_start_ip,
+                                                     self.p1_src_end_ip)
+        base_p2, count_p2 = self._get_start_end_ipv6(self.p2_src_start_ip,
+                                                     self.p2_src_end_ip)
+
+        # Direction 0 --> 1
+        base_pkt_a = Ether() / IPv6(src=self.p1_src_start_ip,
+                                    dst=self.p1_dst_start_ip)
+        # Direction 1 --> 0
+        base_pkt_b = Ether() / IPv6(src=self.p2_src_start_ip,
+                                    dst=self.p2_dst_start_ip)
+
+        # Direction 0 --> 1
+        vm1 = STLScVmRaw([STLVmFlowVar(name="ipv6_src",
+                                       min_value=base_p1,
+                                       max_value=base_p1 + count_p1,
+                                       size=8, op="inc"),
+                          STLVmWrFlowVar(fv_name="ipv6_src",
+                                         pkt_offset="IPv6.src",
+                                         offset_fixup=8)],
+                         split_by_field="ipv6_src")
+        # Direction 1 --> 0
+        vm2 = STLScVmRaw([STLVmFlowVar(name="ipv6_src",
+                                       min_value=base_p2,
+                                       max_value=base_p2 + count_p2,
+                                       size=8, op="inc"),
+                          STLVmWrFlowVar(fv_name="ipv6_src",
+                                         pkt_offset="IPv6.src",
+                                         offset_fixup=8)],
+                         split_by_field="ipv6_src")
+
+        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()