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+# 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 | Run Keywords | Show Packet Trace on All DUTs | ${nodes}
+| ...           | AND          | Show vpp trace dump on all DUTs
+| Documentation | *GREoIPv4 test cases*
+| ...
+| ... | *[Top] Network Topologies:* TG=DUT1 2-node topology with two links
+| ... | between nodes; TG-DUT1-DUT2-TG 3-node circular topology with single
+| ... | links between nodes.
+| ... | *[Enc] Packet Encapsulations:* Eth-IPv4-GRE-IPv4-ICMPv4 on DUT1-DUT2,
+| ... | Eth-IPv4-ICMPv4 on TG-DUTn for routing over GRE tunnel; Eth-IPv4-ICMPv4
+| ... | on TG_if1-DUT, Eth-IPv4-GRE-IPv4-ICMPv4 on TG_if2_DUT for GREoIPv4
+| ... | encapsulation and decapsulation verification.
+| ... | *[Cfg] DUT configuration:* DUT1 and DUT2 are configured with IPv4 routing
+| ... | and static routes. GREoIPv4 tunnel is configured between DUT1 and DUT2.
+| ... | *[Ver] TG verification:* Test ICMPv4 (or ICMPv6) Echo Request packets are
+| ... | sent in both directions by TG on links to DUT1 and DUT2; GREoIPv4
+| ... | encapsulation and decapsulation are verified separately by TG; on
+| ... | receive TG verifies packets for correctness and their IPv4 (IPv6)
+| ... | src-addr, dst-addr and MAC addresses.
+| ... | *[Ref] Applicable standard specifications:* RFC2784.
+
+*** 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 ***
+| TC01: DUT1 and DUT2 route over GREoIPv4 tunnel between two TG links
+| | [Documentation]
+| | ... | [Top] TG-DUT1-DUT2-TG. [Enc] Eth-IPv4-GRE-IPv4-ICMPv4 on \
+| | ... | DUT1-DUT2, Eth-IPv4-ICMPv4 on TG-DUTn. [Cfg] On DUT1 and DUT2
+| | ... | configure GREoIPv4 tunnel with IPv4 routes towards each other.
+| | ... | [Ver] Make TG send ICMPv4 Echo Req between its interfaces across
+| | ... | both DUTs and GRE tunnel between them; verify IPv4 headers on
+| | ... | received packets are correct. [Ref] RFC2784.
+| | [Tags] | 3_NODE_SINGLE_LINK_TOPO | 3_NODE_DOUBLE_LINK_TOPO
+| | 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}
+
+| TC02: DUT encapsulates IPv4 into GREoIPv4 tunnel - GRE header verification
+| | [Documentation]
+| | ... | [Top] TG=DUT1. [Enc] Eth-IPv4-ICMPv4 on TG_if1-DUT, \
+| | ... | Eth-IPv4-GRE-IPv4-ICMPv4 on TG_if2_DUT. [Cfg] On DUT1 configure
+| | ... | GREoIPv4 tunnel with IPv4 route towards TG. [Ver] Make TG send
+| | ... | non-encapsulated ICMPv4 Echo Req to DUT; verify TG received
+| | ... | GREoIPv4 encapsulated packet is correct. [Ref] RFC2784.
+| | [Tags] | 3_NODE_DOUBLE_LINK_TOPO
+| | 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}
+
+| TC03: DUT decapsulates IPv4 from GREoIPv4 tunnel - IPv4 header verification
+| | [Documentation]
+| | ... | [Top] TG=DUT1. [Enc] Eth-IPv4-ICMPv4 on TG_if1-DUT, \
+| | ... | Eth-IPv4-GRE-IPv4-ICMPv4 on TG_if2_DUT. [Cfg] On DUT1 configure
+| | ... | GREoIPv4 tunnel towards TG. [Ver] Make TG send ICMPv4 Echo Req
+| | ... | encapsulated into GREoIPv4 towards VPP; verify TG received IPv4
+| | ... | de-encapsulated packet is correct. [Ref] RFC2784.
+| | [Tags] | 3_NODE_DOUBLE_LINK_TOPO
+| | 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}