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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.
+
+*** Settings ***
+| Library | resources.libraries.python.NodePath
+| Documentation | *Utilities for the path computing, pcap reading*
+| ...
+| ... | Utilities for the path computing, pcap file reading and also the port
+| ... | selection.
+
+*** Keywords ***
+| Path for 2-node testing is set
+| | [Documentation] | Compute the path for the 2 node testing. 
+| | ...
+| | ... | *Arguments:*
+| | ... | - tg_node - TG node. Type: dictionary
+| | ... | - dut_node - DUT node. Type: dictionary
+| | ...
+| | ... | *Return:*
+| | ... | - No value returned.
+| | ...
+| | ... | *Example:*
+| | ...
+| | ... | \| Path for 2-node testing is set \| ${nodes['TG']} \
+| | ... | \| ${nodes['DUT1'] \|
+| | ...
+| | [Arguments] | ${tg_node} | ${dut_node}
+| | Append Nodes | ${tg_node} | ${dut_node}
+| | Compute Path
+
+| Pick out the port used to execute test
+| | [Documentation] | Pick out the port used to execute the test.
+| | ... 
+| | ... | *Arguments:*
+| | ... | - No arguments.
+| | ... 
+| | ... | *Return:*
+| | ... | - No value returned.
+| | ... 
+| | ... | *Example:*
+| | ... 
+| | ... | \| Pick out the port used to execute test \|
+| | ... 
+| | ${tg_port} | ${tg_node}= | First Interface
+| | ${dut_port} | ${dut_node}= | Last Interface
+| | set suite variable | ${tg_node}
+| | set suite variable | ${dut_node}
+| | set suite variable | ${tg_port}
+| | set suite variable | ${dut_port}
+
+| Get the pcap data
+| | [Documentation] | Get the pcap file detailed data.
+| | ...
+| | ... | *Arguments:*
+| | ... | - file_prefix - file prefix. Type: dictionary
+| | ...
+| | ... | *Return:*
+| | ... | - packet_num, dest_ip, is_ipv4 - a tuple of packet_num
+| | ... |   dest_ip, is_ipv4. Type: tuple(int, str, bool)
+| | ...
+| | ... | *Example:*
+| | ...
+| | ... | \| Get the pcap data \| ${tc01_file_prefix} \|
+| | ...
+| | [Arguments] | ${file_prefix}
+| | ${packet_num} | ${dest_ip} | ${is_ipv4}= | Get Pcap Info
+| | ... | ${file_prefix}
+| | set suite variable | ${packet_num}
+| | set suite variable | ${dest_ip}
+| | set suite variable | ${is_ipv4}