Suite:ipv4

File: ipv4_untagged.robot, ipv4_arp_untagged.robot, ipv4_iacl_untagged.robot.
Updated test case names and test case documentation.

Change-Id: Ifdfe6c8cf194299023fff5744d0d44106e7324f1
Signed-off-by: Maciek Konstantynowicz <mkonstan@cisco.com>

Conflicts:
	tests/suites/ipv4/ipv4_arp_untagged.robot
	tests/suites/ipv4/ipv4_iacl_untagged.robot

Change-Id: Ifdfe6c8cf194299023fff5744d0d44106e7324f1
Signed-off-by: Jan Gelety <jgelety@cisco.com>

3 files changed, 138 insertions, 67 deletions

diff --git a/tests/suites/ipv4/ipv4_arp_untagged.robot b/tests/suites/ipv4/ipv4_arp_untagged.robot
index 3af680e815..099cd64020 100644
--- a/tests/suites/ipv4/ipv4_arp_untagged.robot
+++ b/tests/suites/ipv4/ipv4_arp_untagged.robot
@@ -12,7 +12,6 @@
 # limitations under the License.
 
 *** Settings ***
-| Documentation | Check if VPP sends ARP request to unknown destinations.
 | Resource | resources/libraries/robot/default.robot
 | Resource | resources/libraries/robot/counters.robot
 | Resource | resources/libraries/robot/interfaces.robot
@@ -27,6 +26,13 @@
 | ...         | AND          | Update All Interface Data On All Nodes | ${nodes}
 | Test Setup | Setup all DUTs before test
 | Test Teardown | Show packet trace on all DUTs | ${nodes}
+| Documentation | *IPv4 ARP test cases*
+| ...
+| ... | RFC826 ARP: Eth-IPv4 and Eth-ARP on links TG-DUT1, TG-DUT2, DUT1-DUT2:
+| ... | IPv4 ARP tests use 3-node topology TG - DUT1 - DUT2 - TG with one link
+| ... | between the nodes. DUT1 and DUT2 are configured with IPv4 routing and
+| ... | static routes. DUT ARP functionality is tested by making TG send ICMPv4
+| ... | Echo Requests towards its other interface via DUT1 and DUT2.
 
 *** Variables ***
 | ${dut1_to_tg_ip}= | 192.168.1.1
@@ -37,9 +43,31 @@
 | ${prefix_length}= | 24
 
 *** Test Cases ***
-| VPP sends ARP requests for unknown destinations
-| | [Documentation] | Setup IP addresses and route.
-| | ...             | Send ICMP packet and check if VPP sends ARP request.
+| TC01: DUT sends ARP Request for unresolved locally connected IPv4 address
+| | [Documentation]
+| | ... | Make TG send test packet destined to IPv4 address of its other\
+| | ... | interface connected to DUT2. Make TG verify DUT2 sends ARP
+| | ... | Request for locally connected TG IPv4 address.
+| | 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 L2 setup xconnect on DUT
+| | ... | ${dut2_node} | ${dut2_to_dut1} | ${dut2_to_tg}
+| | When Set Interface Address | ${dut1_node}
+| | ... | ${dut1_to_tg} | ${dut1_to_tg_ip} | ${prefix_length}
+| | And Set Interface Address | ${dut1_node}
+| | ... | ${dut1_to_dut2} | ${dut1_to_dut2_ip} | ${prefix_length}
+| | Then Send Packet And Check ARP Request | ${tg_node}
+| | ... | ${test_src_ip} | ${dut1_to_dut2_ip_GW} | ${tg_to_dut1}
+| | ... | ${dut1_to_tg_mac} | ${tg_to_dut2} | ${dut1_to_dut2_mac}
+| | ... | ${dut1_to_dut2_ip} | ${dut1_to_dut2_ip_GW}
+
+| TC02: DUT sends ARP Request for route next hop IPv4 address
+| | [Documentation] |
+| | ... | Make TG send test packet destined to IPv4 address matching\
+| | ... | static route on DUT2. Make TG verify DUT2 sends ARP Request for
+| | ... | next hop of the static route.
+| | [Tags] | EXPECTED_FAILING
 | | Given Path for 3-node testing is set
 | | ... | ${nodes['TG']} | ${nodes['DUT1']} | ${nodes['DUT2']} | ${nodes['TG']}
 | | And Interfaces in 3-node path are up
@@ -51,8 +79,8 @@
 | | ... | ${dut1_to_dut2} | ${dut1_to_dut2_ip} | ${prefix_length}
 | | And Vpp Route Add
 | | ... | ${dut1_node} | ${test_dst_ip} | ${prefix_length}
-| | ... | ${dut1_to_dut2_ip_GW} | ${dut1_to_dut2}
+| | ... | ${dut1_to_dut2_ip_GW} | ${dut1_to_dut2} | resolve_attempts=${NONE}
 | | Then Send Packet And Check ARP Request | ${tg_node}
 | | ... | ${test_src_ip} | ${test_dst_ip} | ${tg_to_dut1}
-| | ... | ${tg_to_dut2_mac} | ${tg_to_dut2} | ${dut1_to_dut2_mac}
+| | ... | ${dut1_to_tg_mac} | ${tg_to_dut2} | ${dut1_to_dut2_mac}
 | | ... | ${dut1_to_dut2_ip} | ${dut1_to_dut2_ip_GW}
diff --git a/tests/suites/ipv4/ipv4_iacl_untagged.robot b/tests/suites/ipv4/ipv4_iacl_untagged.robot
index 0a2aa5e6d4..57ffe8ac2d 100644
--- a/tests/suites/ipv4/ipv4_iacl_untagged.robot
+++ b/tests/suites/ipv4/ipv4_iacl_untagged.robot
@@ -29,6 +29,17 @@
 | Test Setup | Setup all DUTs before test
 | Test Teardown | Run Keywords | Show packet trace on all DUTs | ${nodes}
 | ...           | AND          | Vpp Show Errors | ${nodes['DUT1']}
+| Documentation | *IPv4 routing with ingress ACL test cases*
+| ...
+| ... | Encapsulations: Eth-IPv4 on links TG-DUT1, TG-DUT2, DUT1-DUT2. IPv4
+| ... | ingress ACL (iACL) tests use 3-node topology TG - DUT1 - DUT2 - TG with
+| ... | one link between the nodes. DUT1 and DUT2 are configured with IPv4
+| ... | routing and static routes. DUT1 is configured with iACL on link to TG,
+| ... | iACL classification and permit/deny action are configured on a per test
+| ... | case basis. Test ICMPv4 Echo Request packets are sent in one direction
+| ... | by TG on link to DUT1 and received on TG link to DUT2. On receive TG
+| ... | verifies if packets are dropped, or if received verifies packet IPv4
+| ... | src-addr, dst-addr and MAC addresses.
 
 *** Variables ***
 | ${dut1_to_tg_ip}= | 192.168.1.1
@@ -43,10 +54,10 @@
 | ${l2_table}= | l2
 
 *** Test Cases ***
-| VPP drops packets based on IPv4 source addresses
-| | [Documentation] | Create classify table on VPP, add source IP address
-| | ...             | of traffic into table and setup 'deny' traffic
-| | ...             | and check if traffic is dropped.
+| TC01: DUT with iACL IPv4 src-addr drops matching pkts
+| | [Documentation]
+| | ... | On DUT1 add source IPv4 address to classify table with 'deny'.\
+| | ... | Make TG verify matching packets are dropped.
 | | Given Path for 3-node testing is set
 | | ... | ${nodes['TG']} | ${nodes['DUT1']} | ${nodes['DUT2']} | ${nodes['TG']}
 | | And Interfaces in 3-node path are up
@@ -87,10 +98,10 @@
 | | ... | ${tg_to_dut1_mac} | ${dut1_to_tg_mac} | ${tg_to_dut2}
 | | ... | ${dut1_to_dut2_mac} | ${tg_to_dut2_mac}
 
-| VPP drops packets based on IPv4 destination addresses
-| | [Documentation] | Create classify table on VPP, add destination IP address
-| | ...             | of traffic into table and setup 'deny' traffic
-| | ...             | and check if traffic is dropped.
+| TC02: DUT with iACL IPv4 dst-addr drops matching pkts
+| | [Documentation]
+| | ... | On DUT1 add destination IPv4 address to classify table with 'deny'.\
+| | ... | Make TG verify matching packets are dropped.
 | | Given Path for 3-node testing is set
 | | ... | ${nodes['TG']} | ${nodes['DUT1']} | ${nodes['DUT2']} | ${nodes['TG']}
 | | And Interfaces in 3-node path are up
@@ -134,10 +145,10 @@
 | | ... | ${tg_to_dut1_mac} | ${dut1_to_tg_mac} | ${tg_to_dut2}
 | | ... | ${dut1_to_dut2_mac} | ${tg_to_dut2_mac}
 
-| VPP drops packets based on IPv4 src-addr and dst-addr
-| | [Documentation] | Create classify table on VPP, add source and destination
-| | ...             | IP address of traffic into table and setup 'deny' traffic
-| | ...             | and check if traffic is dropped.
+| TC03: DUT with iACL IPv4 src-addr and dst-addr drops matching pkts
+| | [Documentation]
+| | ... | On DUT1 add source and destination IPv4 addresses to classify table\
+| | ... | with 'deny'. Make TG verify matching packets are dropped.
 | | Given Path for 3-node testing is set
 | | ... | ${nodes['TG']} | ${nodes['DUT1']} | ${nodes['DUT2']} | ${nodes['TG']}
 | | And Interfaces in 3-node path are up
@@ -188,10 +199,10 @@
 | | ... | ${tg_to_dut1_mac} | ${dut1_to_tg_mac} | ${tg_to_dut2}
 | | ... | ${dut1_to_dut2_mac} | ${tg_to_dut2_mac}
 
-| VPP drops packets based on IPv4 protocol (TCP)
-| | [Documentation] | Create classify table on VPP, add mask for TCP port
-| | ...             | into table and setup 'deny' traffic
-| | ...             | and check if TCP traffic is dropped.
+| TC04: DUT with iACL IPv4 protocol set to TCP drops matching pkts
+| | [Documentation]
+| | ... | On DUT1 add protocol mask and TCP protocol (0x06) to classify table\
+| | ... | with 'deny'. Make TG verify matching packets are dropped.
 | | Given Path for 3-node testing is set
 | | ... | ${nodes['TG']} | ${nodes['DUT1']} | ${nodes['DUT2']} | ${nodes['TG']}
 | | And Interfaces in 3-node path are up
@@ -228,10 +239,10 @@
 | | ... | ${test_src_ip} | ${test_dst_ip} | ${tg_to_dut1} | ${tg_to_dut1_mac}
 | | ... | ${tg_to_dut2} | ${dut1_to_tg_mac} | UDP | 80 | 20
 
-| VPP drops packets based on IPv4 protocol (UDP)
-| | [Documentation] | Create classify table on VPP, add mask for UDP port
-| | ...             | into table and setup 'deny' traffic
-| | ...             | and check if UDP traffic is dropped.
+| TC05: DUT with iACL IPv4 protocol set to UDP drops matching pkts
+| | [Documentation]
+| | ... | On DUT1 add protocol mask and UDP protocol (0x11) to classify table\
+| | ... | with 'deny'. Make TG verify matching packets are dropped.
 | | Given Path for 3-node testing is set
 | | ... | ${nodes['TG']} | ${nodes['DUT1']} | ${nodes['DUT2']} | ${nodes['TG']}
 | | And Interfaces in 3-node path are up
@@ -268,10 +279,10 @@
 | | ... | ${test_src_ip} | ${test_dst_ip} | ${tg_to_dut1} | ${tg_to_dut1_mac}
 | | ... | ${tg_to_dut2} | ${dut1_to_tg_mac} | TCP | 80 | 20
 
-| VPP drops packets based on IPv4 TCP src ports
-| | [Documentation] | Create classify table on VPP, add source TCP port
-| | ...             | of traffic into table and setup 'deny' traffic
-| | ...             | and check if traffic is dropped.
+| TC06: DUT with iACL IPv4 TCP src-ports drops matching pkts
+| | [Documentation]
+| | ... | On DUT1 add TCP source ports to classify table with 'deny'.\
+| | ... | Make TG verify matching packets are dropped.
 | | Given Path for 3-node testing is set
 | | ... | ${nodes['TG']} | ${nodes['DUT1']} | ${nodes['DUT2']} | ${nodes['TG']}
 | | And Interfaces in 3-node path are up
@@ -309,10 +320,10 @@
 | | ... | ${test_src_ip} | ${test_dst_ip} | ${tg_to_dut1} | ${tg_to_dut1_mac}
 | | ... | ${tg_to_dut2} | ${dut1_to_tg_mac} | TCP | 110 | 20
 
-| VPP drops packets based on IPv4 TCP dst ports
-| | [Documentation] | Create classify table on VPP, add destination TCP port
-| | ...             | of traffic into table and setup 'deny' traffic
-| | ...             | and check if traffic is dropped.
+| TC07: DUT with iACL IPv4 TCP dst-ports drops matching pkts
+| | [Documentation]
+| | ... | On DUT1 add TCP destination ports to classify table with 'deny'.\
+| | ... | Make TG verify matching packets are dropped.
 | | Given Path for 3-node testing is set
 | | ... | ${nodes['TG']} | ${nodes['DUT1']} | ${nodes['DUT2']} | ${nodes['TG']}
 | | And Interfaces in 3-node path are up
@@ -350,10 +361,10 @@
 | | ... | ${test_src_ip} | ${test_dst_ip} | ${tg_to_dut1} | ${tg_to_dut1_mac}
 | | ... | ${tg_to_dut2} | ${dut1_to_tg_mac} | TCP | 20 | 110
 
-| VPP drops packets based on IPv4 TCP src + dst ports
-| | [Documentation] | Create classify table on VPP, add source and destination
-| | ...             | TCP port of traffic into table and setup 'deny' traffic
-| | ...             | and check if traffic is dropped.
+| TC08: DUT with iACL IPv4 TCP src-ports and dst-ports drops matching pkts
+| | [Documentation]
+| | ... | On DUT1 add TCP source and destination ports to classify table\
+| | ... | with 'deny'. Make TG verify matching packets are dropped.
 | | Given Path for 3-node testing is set
 | | ... | ${nodes['TG']} | ${nodes['DUT1']} | ${nodes['DUT2']} | ${nodes['TG']}
 | | And Interfaces in 3-node path are up
@@ -392,10 +403,10 @@
 | | ... | ${test_src_ip} | ${test_dst_ip} | ${tg_to_dut1} | ${tg_to_dut1_mac}
 | | ... | ${tg_to_dut2} | ${dut1_to_tg_mac} | TCP | 110 | 25
 
-| VPP drops packets based on IPv4 UDP src ports
-| | [Documentation] | Create classify table on VPP, add source UDP port
-| | ...             | of traffic into table and setup 'deny' traffic
-| | ...             | and check if traffic is dropped.
+| TC09: DUT with iACL IPv4 UDP src-ports drops matching pkts
+| | [Documentation]
+| | ... | On DUT1 add UDP source ports to classify table with 'deny'.\
+| | ... | Make TG verify matching packets are dropped.
 | | Given Path for 3-node testing is set
 | | ... | ${nodes['TG']} | ${nodes['DUT1']} | ${nodes['DUT2']} | ${nodes['TG']}
 | | And Interfaces in 3-node path are up
@@ -433,10 +444,10 @@
 | | ... | ${test_src_ip} | ${test_dst_ip} | ${tg_to_dut1} | ${tg_to_dut1_mac}
 | | ... | ${tg_to_dut2} | ${dut1_to_tg_mac} | UDP | 110 | 20
 
-| VPP drops packets based on IPv4 UDP dst ports
-| | [Documentation] | Create classify table on VPP, add destination UDP port
-| | ...             | of traffic into table and setup 'deny' traffic
-| | ...             | and check if traffic is dropped.
+| TC10: DUT with iACL IPv4 UDP dst-ports drops matching pkts
+| | [Documentation]
+| | ... | On DUT1 add TCP destination ports to classify table with 'deny'.\
+| | ... | Make TG verify matching packets are dropped.
 | | Given Path for 3-node testing is set
 | | ... | ${nodes['TG']} | ${nodes['DUT1']} | ${nodes['DUT2']} | ${nodes['TG']}
 | | And Interfaces in 3-node path are up
@@ -474,10 +485,10 @@
 | | ... | ${test_src_ip} | ${test_dst_ip} | ${tg_to_dut1} | ${tg_to_dut1_mac}
 | | ... | ${tg_to_dut2} | ${dut1_to_tg_mac} | UDP | 20 | 110
 
-| VPP drops packets based on IPv4 UDP src + dst ports
-| | [Documentation] | Create classify table on VPP, add source and destination
-| | ...             | UDP port of traffic into table and setup 'deny' traffic
-| | ...             | and check if traffic is dropped.
+| TC11: DUT with iACL IPv4 UDP src-ports and dst-ports drops matching pkts
+| | [Documentation]
+| | ... | On DUT1 add UDP source and destination ports to classify table\
+| | ... | with 'deny'. Make TG verify matching packets are dropped.
 | | Given Path for 3-node testing is set
 | | ... | ${nodes['TG']} | ${nodes['DUT1']} | ${nodes['DUT2']} | ${nodes['TG']}
 | | And Interfaces in 3-node path are up
@@ -516,10 +527,10 @@
 | | ... | ${test_src_ip} | ${test_dst_ip} | ${tg_to_dut1} | ${tg_to_dut1_mac}
 | | ... | ${tg_to_dut2} | ${dut1_to_tg_mac} | UDP | 110 | 25
 
-| VPP drops packets based on MAC src addr
-| | [Documentation] | Create classify table on VPP, add source MAC address
-| | ...             | of traffic into table and setup 'deny' traffic
-| | ...             | and check if traffic is dropped.
+| TC12: DUT with iACL MAC src-addr drops matching pkts
+| | [Documentation]
+| | ... | On DUT1 add source MAC address to classify table with 'deny'.\
+| | ... | Make TG verify matching packets are dropped.
 | | Given Path for 3-node testing is set
 | | ... | ${nodes['TG']} | ${nodes['DUT1']} | ${nodes['DUT2']} | ${nodes['TG']}
 | | And Interfaces in 3-node path are up
diff --git a/tests/suites/ipv4/ipv4_untagged.robot b/tests/suites/ipv4/ipv4_untagged.robot
index 45ab5768c7..e19cc02388 100644
--- a/tests/suites/ipv4/ipv4_untagged.robot
+++ b/tests/suites/ipv4/ipv4_untagged.robot
@@ -24,10 +24,23 @@
 | ...         | AND          | Setup DUT nodes for IPv4 testing
 | Test Setup | Clear interface counters on all vpp nodes in topology | ${nodes}
 | Test Teardown | Run Keyword If Test Failed | Show packet trace on all DUTs | ${nodes}
+| Documentation | *IPv4 routing test cases*
+| ...
+| ... | RFC791 IPv4, RFC826 ARP, RFC792 ICMPv4. Encapsulations: Eth-IPv4-ICMPv4
+| ... | on links TG-DUT1, TG-DUT2, DUT1-DUT2. IPv4 routing tests use circular
+| ... | 3-node topology TG - DUT1 - DUT2 - TG with one link between the nodes.
+| ... | DUT1 and DUT2 are configured with IPv4 routing and static routes. Test
+| ... | ICMPv4 Echo Request packets are sent in both directions by TG on links
+| ... | to DUT1 and DUT2 and received on TG links on the other side of circular
+| ... | topology. On receive TG verifies packets IPv4 src-addr, dst-addr and MAC
+| ... | addresses.
 
 *** Test Cases ***
 
-| VPP replies to ICMPv4 echo request
+| TC01: DUT replies to ICMPv4 Echo Req to its ingress interface
+| | [Documentation]
+| | ... | Make TG send ICMPv4 Echo Req to DUT ingress interface. Make TG\
+| | ... | verify ICMP Echo Reply is correct.
 | | [Tags] | 3_NODE_SINGLE_LINK_TOPO | VM_ENV
 | | Append Nodes | ${nodes['TG']} | ${nodes['DUT1']}
 | | Compute Path
@@ -36,7 +49,10 @@
 | | ${hops}= | Set Variable | ${0}
 | | Node "${src_node}" interface "${src_port}" can route to node "${dst_node}" interface "${dst_port}" ${hops} hops away using IPv4
 
-| TG can route to DUT egress interface
+| TC02: DUT routes IPv4 to its egress interface
+| | [Documentation]
+| | ... | Make TG send ICMPv4 Echo Req towards DUT1 egress interface\
+| | ... | connected to DUT2. Make TG verify ICMPv4 Echo Reply is correct.
 | | [Tags] | 3_NODE_SINGLE_LINK_TOPO | VM_ENV
 | | Append Nodes | ${nodes['TG']} | ${nodes['DUT1']} | ${nodes['DUT2']}
 | | Compute Path
@@ -45,7 +61,10 @@
 | | ${hops}= | Set Variable | ${0}
 | | Node "${src_node}" interface "${src_port}" can route to node "${dst_node}" interface "${dst_port}" ${hops} hops away using IPv4
 
-| TG can route to DUT2 through DUT1
+| TC03: DUT1 routes IPv4 to DUT2 ingress interface
+| | [Documentation]
+| | ... | Make TG send ICMPv4 Echo Req towards DUT2 ingress interface\
+| | ... | connected to DUT1. Make TG verify ICMPv4 Echo Reply is correct.
 | | [Tags] | 3_NODE_SINGLE_LINK_TOPO | VM_ENV
 | | Append Nodes | ${nodes['TG']} | ${nodes['DUT1']} | ${nodes['DUT2']}
 | | Compute Path
@@ -54,7 +73,10 @@
 | | ${hops}= | Set Variable | ${1}
 | | Node "${src_node}" interface "${src_port}" can route to node "${dst_node}" interface "${dst_port}" ${hops} hops away using IPv4
 
-| TG can route to DUT2 egress interface through DUT1
+| TC04: DUT1 routes IPv4 to DUT2 egress interface
+| | [Documentation]
+| | ... | Make TG send ICMPv4 Echo Req towards DUT2 egress interface\
+| | ... | connected to TG. Make TG verify ICMPv4 Echo Reply is correct.
 | | [Tags] | 3_NODE_SINGLE_LINK_TOPO | VM_ENV
 | | Append Nodes | ${nodes['TG']} | ${nodes['DUT1']} | ${nodes['DUT2']} | ${nodes['TG']}
 | | Compute Path
@@ -63,7 +85,10 @@
 | | ${hops}= | Set Variable | ${1}
 | | Node "${src_node}" interface "${src_port}" can route to node "${dst_node}" interface "${dst_port}" ${hops} hops away using IPv4
 
-| TG can route to TG through DUT1 and DUT2
+| TC05: DUT1 and DUT2 route IPv4 between TG interfaces
+| | [Documentation]
+| | ... | Make TG send ICMPv4 Echo Req between its interfaces across DUT1\
+| | ... | and DUT2. Make TG verify ICMPv4 Echo Replies are correct.
 | | [Tags] | 3_NODE_SINGLE_LINK_TOPO | VM_ENV
 | | Append Nodes | ${nodes['TG']} | ${nodes['DUT1']} | ${nodes['DUT2']} | ${nodes['TG']}
 | | Compute Path
@@ -84,15 +109,20 @@
 | | ${port} | ${node}= | Next Interface
 | | Check ipv4 interface counter | ${node} | ${port} | ${exp_counter_val}
 
-| VPP can process ICMP echo request from min to 1500B packet size with 1B increment
+| TC06: DUT replies to ICMPv4 Echo Reqs with size 64B-to-1500B-incr-1B
+| | [Documentation]
+| | ... | Make TG send ICMPv4 Echo Reqs to DUT ingress interface,\
+| | ... | incrementating frame size from 64B to 1500B with increment step
+| | ... | of 1Byte. Make TG verify ICMP Echo Replies are correct.
 | | [Tags] | 3_NODE_SINGLE_LINK_TOPO | VM_ENV
 | | Ipv4 icmp echo sweep | ${nodes['TG']} | ${nodes['DUT1']} | 0 | 1452 | 1
 
-| VPP can process ICMP echo request from 1500B to max packet size with 10B increment
+| TC07: DUT replies to ICMPv4 Echo Reqs with size 1500B-to-9000B-incr-10B
+| | [Documentation]
+| | ... | Make TG send ICMPv4 Echo Reqs to DUT ingress interface,\
+| | ... | incrementating frame size from 1500B to 9000B with increment
+| | ... | step of 10Bytes. Make TG verify ICMPv4 Echo Replies are correct.
 | | [Tags] | 3_NODE_SINGLE_LINK_TOPO
-| | [Documentation] | This test case cannot be run reliably on VM_ENV because
-| | ...             | the virtual hosts can be connected using a bridge which
-| | ...             | has its own MTU
 | | [Setup] | Setup MTU on TG based on MTU on DUT | ${nodes['TG']} | ${nodes['DUT1']}
 | | [Teardown] | Set default Ethernet MTU on all interfaces on node | ${nodes['TG']}
 | | Append Nodes | ${nodes['TG']} | ${nodes['DUT1']}
@@ -103,9 +133,11 @@
 | | # IPv4 header and ICMP header
 | | ${end_size}= | Evaluate | ${mtu} - 14 - 4 - 20 - 8
 | | Run Keyword If | ${mtu} > 1518
-| | ...            | Ipv4 icmp echo sweep | ${nodes['TG']} | ${nodes['DUT1']}
-| | ...            | 1452 | ${end_size} | 10
+| | ... | Ipv4 icmp echo sweep | ${nodes['TG']} | ${nodes['DUT1']}
+| | ... | 1452 | ${end_size} | 10
 
-| VPP responds to ARP request
+| TC08: DUT replies to ARP request
+| | [Documentation]
+| | ... | Make TG send ARP Request to DUT and verify ARP Reply is correct.\
 | | [Tags] | 3_NODE_SINGLE_LINK_TOPO | VM_ENV
 | | Send ARP request and validate response | ${nodes['TG']} | ${nodes['DUT1']}