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-rwxr-xr-xbootstrap.sh2
-rw-r--r--resources/libraries/python/InterfaceUtil.py35
-rw-r--r--resources/libraries/robot/gre.robot123
-rw-r--r--resources/templates/vat/create_gre.vat1
-rwxr-xr-xresources/traffic_scripts/send_gre_check_icmp_headers.py86
-rwxr-xr-xresources/traffic_scripts/send_icmp_check_gre_headers.py92
-rw-r--r--tests/suites/gre/gre_encapsulation.robot128
7 files changed, 465 insertions, 2 deletions
diff --git a/bootstrap.sh b/bootstrap.sh
index de6cd3722a..3f29f9856e 100755
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -70,7 +70,7 @@ if [ "${#}" -ne "0" ]; then
echo ${arr[0]}
else
rm -f *.deb
- VPP_STABLE_VER="1.0.0-437~g8f15e92_amd64"
+ VPP_STABLE_VER="1.0.0-451~g686a5a5_amd64"
VPP_REPO_URL="https://nexus.fd.io/service/local/repositories/fd.io.dev/content/io/fd/vpp"
wget -q "${VPP_REPO_URL}/vpp/${VPP_STABLE_VER}/vpp-${VPP_STABLE_VER}.deb" || exit
wget -q "${VPP_REPO_URL}/vpp-dbg/${VPP_STABLE_VER}/vpp-dbg-${VPP_STABLE_VER}.deb" || exit
diff --git a/resources/libraries/python/InterfaceUtil.py b/resources/libraries/python/InterfaceUtil.py
index 6790fb7221..94250fba28 100644
--- a/resources/libraries/python/InterfaceUtil.py
+++ b/resources/libraries/python/InterfaceUtil.py
@@ -572,7 +572,40 @@ class InterfaceUtil(object):
with VatTerminal(node) as vat:
vat.vat_terminal_exec_cmd('exec show interfaces')
- return '{}.{}'.format(interface, sub_id), sw_subif_index
+ name = '{}.{}'.format(interface, sub_id)
+ return name, sw_subif_index
+
+ @staticmethod
+ def create_gre_tunnel_interface(node, source_ip, destination_ip):
+ """Create GRE tunnel interface on node.
+
+ :param node: VPP node to add tunnel interface.
+ :param source_ip: Source of the GRE tunnel.
+ :param destination_ip: Destination of the GRE tunnel.
+ :type node: dict
+ :type source_ip: str
+ :type destination_ip: str
+ :return: Name and index of created GRE tunnel interface.
+ :rtype: tuple
+ :raises RuntimeError: If unable to create GRE tunnel interface.
+ """
+ output = VatExecutor.cmd_from_template(node, "create_gre.vat",
+ src=source_ip,
+ dst=destination_ip)
+ output = output[0]
+
+ if output["retval"] == 0:
+ sw_if_index = output["sw_if_index"]
+
+ vat_executor = VatExecutor()
+ vat_executor.execute_script_json_out("dump_interfaces.vat", node)
+ interface_dump_json = vat_executor.get_script_stdout()
+ name = VatJsonUtil.get_interface_name_from_json(
+ interface_dump_json, sw_if_index)
+ return name, sw_if_index
+ else:
+ raise RuntimeError('Unable to create GRE tunnel on node {}.'
+ .format(node))
@staticmethod
def vpp_create_loopback(node):
diff --git a/resources/libraries/robot/gre.robot b/resources/libraries/robot/gre.robot
new file mode 100644
index 0000000000..b2036b840d
--- /dev/null
+++ b/resources/libraries/robot/gre.robot
@@ -0,0 +1,123 @@
+# Copyright (c) 2016 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 ***
+| Resource | resources/libraries/robot/interfaces.robot
+
+*** Keywords ***
+| GRE tunnel interface is created and up
+| | [Documentation] | Create GRE tunnel interface on defined VPP node and put
+| | ... | the interface to UP state.
+| | ...
+| | ... | *Arguments:*
+| | ... | - ${dut_node} - DUT node where to create GRE tunnel. Type: dictionary
+| | ... | - ${source_ip_address} - GRE tunnel source IP address. Type: string
+| | ... | - ${destination_ip_address} - GRE tunnel destination IP address.
+| | ... | Type: string
+| | ...
+| | ... | *Return:*
+| | ... | - ${name} - Name of created GRE tunnel interface. Type: string
+| | ... | - ${index} - SW interface index of created GRE tunnel interface.
+| | ... | Type: integer
+| | ...
+| | ... | *Example:*
+| | ...
+| | ... | \| ${gre_name} \| ${gre_index}= \
+| | ... | \| GRE tunnel interface is created and up \| ${dut} \
+| | ... | \| 192.0.1.1 \| 192.0.1.2 \|
+| | ...
+| | [Arguments] | ${dut_node} | ${source_ip_address} | ${destination_ip_address}
+| | ${name} | ${index}= | Create GRE Tunnel Interface
+| | | | ... | ${dut_node} | ${source_ip_address} | ${destination_ip_address}
+| | Set Interface State | ${dut_node} | ${index} | up
+| | [Return] | ${name} | ${index}
+
+
+| Send ICMPv4 and check received GRE header
+| | [Documentation] | Send ICMPv4 packet and check if received packed contains
+| | ... | correct GRE, IP, MAC headers.
+| | ...
+| | ... | *Arguments:*
+| | ... | - ${tg_node} - Node where to run traffic script. Type: dictionary
+| | ... | - ${tx_if} - Interface from where send ICPMv4 packet. Type: string
+| | ... | - ${rx_if} - Interface where to receive GRE packet. Type: string
+| | ... | - ${tx_dst_mac} - Destination MAC address of ICMP packet. Type: string
+| | ... | - ${rx_dst_mac} - Expected destination MAC address of GRE packet.
+| | ... | Type: string
+| | ... | - ${inner_src_ip} - Source IP address of ICMP packet. Type: string
+| | ... | - ${inner_dst_ip} - Destination IP address of ICMP packet.
+| | ... | Type: string
+| | ... | - ${outer_src_ip} - Source IP address of GRE packet. Type: string
+| | ... | - ${outer_dst_ip} - Destination IP address of GRE packet.
+| | ... | Type: string
+| | ...
+| | ... | *Return:*
+| | ... | - No value returned
+| | ...
+| | ... | *Example:*
+| | ...
+| | ... | \| Send ICMPv4 and check received GRE header \
+| | ... | \| ${tg_node} \| ${tg_to_dut_if1} \| ${tg_to_dut_if2} \
+| | ... | \| ${tx_dst_mac} \| ${rx_dst_mac} \| ${net1_host_address} \
+| | ... | \| ${net2_host_address} \| ${dut1_ip_address} \| ${dut2_ip_address} \|
+| | ...
+| | [Arguments] | ${tg_node} | ${tx_if} | ${rx_if}
+| | ... | ${tx_dst_mac} | ${rx_dst_mac}
+| | ... | ${inner_src_ip} | ${inner_dst_ip}
+| | ... | ${outer_src_ip} | ${outer_dst_ip}
+| | ${args}= | Catenate | --tx_if | ${tx_if} | --rx_if | ${rx_if}
+| | | ... | --tx_dst_mac | ${tx_dst_mac} | --rx_dst_mac | ${rx_dst_mac}
+| | | ... | --inner_src_ip | ${inner_src_ip} | --inner_dst_ip | ${inner_dst_ip}
+| | | ... | --outer_src_ip | ${outer_src_ip} | --outer_dst_ip | ${outer_dst_ip}
+| | Run Traffic Script On Node
+| | ... | send_icmp_check_gre_headers.py | ${tg_node} | ${args}
+
+
+| Send GRE and check received ICMPv4 header
+| | [Documentation] | Send ICMPv4 packet and check if received packed contains
+| | ... | correct GRE, IP, MAC headers.
+| | ...
+| | ... | *Arguments:*
+| | ... | - ${tg_node} - Node where to run traffic script. Type: dictionary
+| | ... | - ${tx_if} - Interface from where send ICPMv4 packet. Type: string
+| | ... | - ${rx_if} - Interface where receive GRE packet. Type: string
+| | ... | - ${tx_dst_mac} - Destination MAC address of GRE packet. Type: string
+| | ... | - ${rx_dst_mac} - Expected destination MAC address of ICMP packet.
+| | ... | Type: string
+| | ... | - ${inner_src_ip} - Source IP address of ICMP packet. Type: string
+| | ... | - ${inner_dst_ip} - Destination IP address of ICMP packet.
+| | ... | Type: string
+| | ... | - ${outer_src_ip} - Source IP address of GRE packet. Type: string
+| | ... | - ${outer_dst_ip} - Destination IP address of GRE packet.
+| | ... | Type: string
+| | ...
+| | ... | *Return:*
+| | ... | - No value returned
+| | ...
+| | ... | *Example:*
+| | ...
+| | ... | \| Send GRE and check received ICMPv4 header \| ${tg_node} \
+| | ... | \| ${tg_to_dut_if2} \| ${tg_to_dut_if1} \| ${tx_dst_mac} \
+| | ... | \| ${rx_dst_mac} \| ${net2_host_address} \| ${net1_host_address} \
+| | ... | \| ${dut2_ip_address} \| ${dut1_ip_address} \|
+| | ...
+| | [Arguments] | ${tg_node} | ${tx_if} | ${rx_if}
+| | ... | ${tx_dst_mac} | ${rx_dst_mac}
+| | ... | ${inner_src_ip} | ${inner_dst_ip}
+| | ... | ${outer_src_ip} | ${outer_dst_ip}
+| | ${args}= | Catenate | --tx_if | ${tx_if} | --rx_if | ${rx_if}
+| | | ... | --tx_dst_mac | ${tx_dst_mac} | --rx_dst_mac | ${rx_dst_mac}
+| | | ... | --inner_src_ip | ${inner_src_ip} | --inner_dst_ip | ${inner_dst_ip}
+| | | ... | --outer_src_ip | ${outer_src_ip} | --outer_dst_ip | ${outer_dst_ip}
+| | Run Traffic Script On Node
+| | ... | send_gre_check_icmp_headers.py | ${tg_node} | ${args}
diff --git a/resources/templates/vat/create_gre.vat b/resources/templates/vat/create_gre.vat
new file mode 100644
index 0000000000..26cdcfb9b8
--- /dev/null
+++ b/resources/templates/vat/create_gre.vat
@@ -0,0 +1 @@
+gre_add_del_tunnel src {src} dst {dst}
diff --git a/resources/traffic_scripts/send_gre_check_icmp_headers.py b/resources/traffic_scripts/send_gre_check_icmp_headers.py
new file mode 100755
index 0000000000..27eac5d786
--- /dev/null
+++ b/resources/traffic_scripts/send_gre_check_icmp_headers.py
@@ -0,0 +1,86 @@
+#!/usr/bin/env python
+# Copyright (c) 2016 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.
+
+"""Traffic script that sends a GRE encapsulated ICMPv4 packet from one
+interface to the other, where is expected ICMPv4 without GRE header.
+"""
+
+import sys
+
+from robot.api import logger
+from scapy.all import Ether
+from scapy.layers.inet import IP_PROTOS
+from scapy.layers.inet import IP
+from scapy.layers.inet import ICMP
+from scapy.layers.l2 import GRE
+
+from resources.libraries.python.PacketVerifier import RxQueue, TxQueue
+from resources.libraries.python.TrafficScriptArg import TrafficScriptArg
+
+
+def main():
+ args = TrafficScriptArg(
+ ['tx_dst_mac', 'rx_dst_mac',
+ 'inner_src_ip', 'inner_dst_ip',
+ 'outer_src_ip', 'outer_dst_ip'])
+
+ tx_if = args.get_arg('tx_if')
+ rx_if = args.get_arg('rx_if')
+ tx_dst_mac = args.get_arg('tx_dst_mac')
+ rx_dst_mac = args.get_arg('rx_dst_mac')
+ inner_src_ip = args.get_arg('inner_src_ip')
+ inner_dst_ip = args.get_arg('inner_dst_ip')
+ outer_src_ip = args.get_arg('outer_src_ip')
+ outer_dst_ip = args.get_arg('outer_dst_ip')
+
+ rxq = RxQueue(rx_if)
+ txq = TxQueue(tx_if)
+ sent_packets = []
+
+ tx_pkt_raw = Ether(dst=tx_dst_mac) / \
+ IP(src=outer_src_ip, dst=outer_dst_ip) / \
+ GRE() / \
+ IP(src=inner_src_ip, dst=inner_dst_ip) / \
+ ICMP()
+
+ sent_packets.append(tx_pkt_raw)
+ txq.send(tx_pkt_raw)
+ ether = rxq.recv(2)
+
+ if ether is None:
+ raise RuntimeError("ICMP echo Rx timeout")
+
+ # Check RX headers
+ if ether.dst != rx_dst_mac:
+ raise RuntimeError("Matching of received destination MAC unsuccessful.")
+ logger.debug("Comparison of received destination MAC: OK.")
+
+ if ether['IP'].src != inner_src_ip:
+ raise RuntimeError("Matching of received inner source IP unsuccessful.")
+ logger.debug("Comparison of received outer source IP: OK.")
+
+ if ether['IP'].dst != inner_dst_ip:
+ raise RuntimeError(
+ "Matching of received inner destination IP unsuccessful.")
+ logger.debug("Comparison of received outer destination IP: OK.")
+
+ if ether['IP'].proto != IP_PROTOS.icmp:
+ raise RuntimeError("IP protocol is other than ICMP.")
+ logger.debug("Comparison of received ICMP protocol: OK.")
+
+ sys.exit(0)
+
+
+if __name__ == "__main__":
+ main()
diff --git a/resources/traffic_scripts/send_icmp_check_gre_headers.py b/resources/traffic_scripts/send_icmp_check_gre_headers.py
new file mode 100755
index 0000000000..ccea9f5d9b
--- /dev/null
+++ b/resources/traffic_scripts/send_icmp_check_gre_headers.py
@@ -0,0 +1,92 @@
+#!/usr/bin/env python
+# Copyright (c) 2016 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.
+
+"""Traffic script that sends an ICMPv4 packet from one interface to the other,
+where GRE encapsulated packet is expected.
+"""
+
+import sys
+
+from robot.api import logger
+from scapy.all import Ether
+from scapy.layers.inet import IP_PROTOS
+from scapy.layers.inet import IP
+from scapy.layers.inet import ICMP
+
+from resources.libraries.python.PacketVerifier import RxQueue, TxQueue
+from resources.libraries.python.TrafficScriptArg import TrafficScriptArg
+
+
+def main():
+ args = TrafficScriptArg(
+ ['tx_dst_mac', 'rx_dst_mac',
+ 'inner_src_ip', 'inner_dst_ip',
+ 'outer_src_ip', 'outer_dst_ip'])
+
+ tx_if = args.get_arg('tx_if')
+ rx_if = args.get_arg('rx_if')
+ tx_dst_mac = args.get_arg('tx_dst_mac')
+ rx_dst_mac = args.get_arg('rx_dst_mac')
+ inner_src_ip = args.get_arg('inner_src_ip')
+ inner_dst_ip = args.get_arg('inner_dst_ip')
+ outer_src_ip = args.get_arg('outer_src_ip')
+ outer_dst_ip = args.get_arg('outer_dst_ip')
+
+ rxq = RxQueue(rx_if)
+ txq = TxQueue(tx_if)
+ sent_packets = []
+
+ tx_pkt_raw = Ether(dst=tx_dst_mac) / \
+ IP(src=inner_src_ip, dst=inner_dst_ip) / \
+ ICMP()
+
+ sent_packets.append(tx_pkt_raw)
+ txq.send(tx_pkt_raw)
+ ether = rxq.recv(2)
+
+ if ether is None:
+ raise RuntimeError("ICMP echo Rx timeout")
+
+ # Check RX headers
+ if ether.dst != rx_dst_mac:
+ raise RuntimeError("Matching of received destination MAC unsuccessful.")
+ logger.debug("Comparison of received destination MAC: OK.")
+
+ if ether['IP'].src != outer_src_ip:
+ raise RuntimeError("Matching of received outer source IP unsuccessful.")
+ logger.debug("Comparison of received outer source IP: OK.")
+
+ if ether['IP'].dst != outer_dst_ip:
+ raise RuntimeError(
+ "Matching of received outer destination IP unsuccessful.")
+ logger.debug("Comparison of received outer destination IP: OK.")
+
+ if ether['IP'].proto != IP_PROTOS.gre:
+ raise RuntimeError("IP protocol is no GRE.")
+ logger.debug("Comparison of received GRE protocol: OK.")
+
+ if ether['IP']['GRE']['IP'].src != inner_src_ip:
+ raise RuntimeError("Matching of received inner source IP unsuccessful.")
+ logger.debug("Comparison of received inner source IP: OK.")
+
+ if ether['IP']['GRE']['IP'].dst != inner_dst_ip:
+ raise RuntimeError(
+ "Matching of received inner destination IP unsuccessful.")
+ logger.debug("Comparison of received inner destination IP: OK.")
+
+ sys.exit(0)
+
+
+if __name__ == "__main__":
+ main()
diff --git a/tests/suites/gre/gre_encapsulation.robot b/tests/suites/gre/gre_encapsulation.robot
new file mode 100644
index 0000000000..1ccd1dc051
--- /dev/null
+++ b/tests/suites/gre/gre_encapsulation.robot
@@ -0,0 +1,128 @@
+# Copyright (c) 2016 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 ***
+| Resource | resources/libraries/robot/default.robot
+| Resource | resources/libraries/robot/testing_path.robot
+| Resource | resources/libraries/robot/ipv4.robot
+| Resource | resources/libraries/robot/gre.robot
+| Resource | resources/libraries/robot/traffic.robot
+| Library | resources.libraries.python.IPUtil
+| Library | resources.libraries.python.Trace
+| Force Tags | VM_ENV | HW_ENV
+| Test Setup | Run Keywords | Setup all DUTs before test
+| ... | AND | Setup all TGs before traffic script
+| Test Teardown | Show Packet Trace on All DUTs | ${nodes}
+| Documentation | *GRE test suite.*
+| ...
+| ... | Test suite uses 2-node topology TG - DUT1 - TG with two links
+| ... | between nodes as well as 3-node topology TG - DUT1 - DUT2 - TG
+| ... | with one link between nodes. Test packets are sent from TG to DUT1.
+| ... | DUT1 encapsulate packet into GRE and send out from other interface.
+| ... | Traffic scripts check received MAC headers, IP headers and GRE headers.
+
+*** Variables ***
+| ${net1_address}= | 192.168.0.0
+| ${net1_host_address}= | 192.168.0.100
+| ${net1_gw_address}= | 192.168.0.1
+| ${net2_address}= | 192.168.2.0
+| ${net2_host_address}= | 192.168.2.100
+| ${net2_gw_address}= | 192.168.2.1
+| ${dut1_ip_address}= | 192.168.1.1
+| ${dut2_ip_address}= | 192.168.1.2
+| ${dut1_gre_ip}= | 172.16.0.1
+| ${dut2_gre_ip}= | 172.16.0.2
+| ${prefix}= | 24
+
+*** Test Cases ***
+| VPP can route IPv4 traffic from GRE tunnel
+| | [Tags] | 3_NODE_SINGLE_LINK_TOPO | 3_NODE_DOUBLE_LINK_TOPO
+| | [Documentation] | Create GRE configuration on 2 DUTs, send IP traffic and
+| | ... | check IP is not changed.
+| | Given Path for 3-node testing is set | ${nodes['TG']} | ${nodes['DUT1']}
+| | ... | ${nodes['DUT2']} | ${nodes['TG']}
+| | And Interfaces in 3-node path are up
+| | And IP addresses are set on interfaces
+| | ... | ${dut1_node} | ${dut1_to_dut2} | ${dut1_ip_address} | ${prefix}
+| | ... | ${dut1_node} | ${dut1_to_tg} | ${net1_gw_address} | ${prefix}
+| | ... | ${dut2_node} | ${dut2_to_dut1} | ${dut2_ip_address} | ${prefix}
+| | ... | ${dut2_node} | ${dut2_to_tg} | ${net2_gw_address} | ${prefix}
+| | And VPP IP Probe | ${dut1_node} | ${dut1_to_dut2} | ${dut2_ip_address}
+| | And VPP IP Probe | ${dut2_node} | ${dut2_to_dut1} | ${dut1_ip_address}
+| | And Add Arp On Dut | ${dut2_node} | ${dut2_to_tg} | ${net2_host_address}
+| | ... | ${tg_to_dut2_mac}
+| | ${dut1_gre_interface} | ${dut1_gre_index}=
+| | | ... | When GRE tunnel interface is created and up
+| | | | ... | ${dut1_node} | ${dut1_ip_address} | ${dut2_ip_address}
+| | ${dut2_gre_interface} | ${dut2_gre_index}=
+| | | ... | And GRE tunnel interface is created and up
+| | | | ... | ${dut2_node} | ${dut2_ip_address} | ${dut1_ip_address}
+| | And IP addresses are set on interfaces
+| | ... | ${dut1_node} | ${dut1_gre_index} | ${dut1_gre_ip} | ${prefix}
+| | ... | ${dut2_node} | ${dut2_gre_index} | ${dut2_gre_ip} | ${prefix}
+| | And Vpp Route Add | ${dut1_node} | ${net2_address} | ${prefix}
+| | ... | ${dut2_gre_ip} | ${dut1_gre_index}
+| | Then Send Packet And Check Headers | ${tg_node}
+| | ... | ${net1_host_address} | ${net2_host_address}
+| | ... | ${tg_to_dut1} | ${tg_to_dut1_mac} | ${dut1_to_tg_mac}
+| | ... | ${tg_to_dut2} | ${dut2_to_tg_mac} | ${tg_to_dut2_mac}
+
+
+| VPP can encapsulate IPv4 traffic in GRE
+| | [Tags] | 3_NODE_DOUBLE_LINK_TOPO
+| | [Documentation] | Create GRE configuration on DUT, send IP traffic and
+| | ... | check IP is correctly encapsulate into GRE.
+| | Given Path for 2-node testing is set
+| | ... | ${nodes['TG']} | ${nodes['DUT1']} | ${nodes['TG']}
+| | And Interfaces in 2-node path are up
+| | And IP addresses are set on interfaces
+| | ... | ${dut_node} | ${dut_to_tg_if2} | ${dut1_ip_address} | ${prefix}
+| | ... | ${dut_node} | ${dut_to_tg_if1} | ${net1_gw_address} | ${prefix}
+| | And Add Arp On Dut | ${dut_node} | ${dut_to_tg_if2} | ${dut2_ip_address}
+| | ... | ${tg_to_dut_if2_mac}
+| | ${dut1_gre_interface} | ${dut1_gre_index}=
+| | | ... | When GRE tunnel interface is created and up
+| | | | ... | ${dut_node} | ${dut1_ip_address} | ${dut2_ip_address}
+| | And IP addresses are set on interfaces
+| | ... | ${dut_node} | ${dut1_gre_index} | ${dut1_gre_ip} | ${prefix}
+| | And Vpp Route Add | ${dut_node} | ${net2_address} | ${prefix}
+| | ... | ${dut2_gre_ip} | ${dut1_gre_index}
+| | Then Send ICMPv4 and check received GRE header
+| | ... | ${tg_node} | ${tg_to_dut_if1} | ${tg_to_dut_if2}
+| | ... | ${dut_to_tg_if1_mac} | ${tg_to_dut_if2_mac}
+| | ... | ${net1_host_address} | ${net2_host_address}
+| | ... | ${dut1_ip_address} | ${dut2_ip_address}
+
+
+| VPP can decapsulate IPv4 traffic in GRE
+| | [Tags] | 3_NODE_DOUBLE_LINK_TOPO
+| | [Documentation] | Create GRE configuration on DUT, send GRE encapsulated
+| | ... | traffic and check IP is received without GRE headers.
+| | Given Path for 2-node testing is set
+| | ... | ${nodes['TG']} | ${nodes['DUT1']} | ${nodes['TG']}
+| | And Interfaces in 2-node path are up
+| | And IP addresses are set on interfaces
+| | ... | ${dut_node} | ${dut_to_tg_if2} | ${dut1_ip_address} | ${prefix}
+| | ... | ${dut_node} | ${dut_to_tg_if1} | ${net1_gw_address} | ${prefix}
+| | And Add Arp On Dut | ${dut_node} | ${dut_to_tg_if1} | ${net1_host_address}
+| | ... | ${tg_to_dut_if1_mac}
+| | ${dut1_gre_interface} | ${dut1_gre_index}=
+| | | ... | When GRE tunnel interface is created and up
+| | | | ... | ${dut_node} | ${dut1_ip_address} | ${dut2_ip_address}
+| | And IP addresses are set on interfaces
+| | ... | ${dut_node} | ${dut1_gre_index} | ${dut1_gre_ip} | ${prefix}
+| | Then Send GRE and check received ICMPv4 header
+| | ... | ${tg_node} | ${tg_to_dut_if2} | ${tg_to_dut_if1}
+| | ... | ${dut_to_tg_if2_mac} | ${tg_to_dut_if1_mac}
+| | ... | ${net2_host_address} | ${net1_host_address}
+| | ... | ${dut2_ip_address} | ${dut1_ip_address}