Tap Interface Traffic Tests
(Top) Network Topologies: TG=DUT1 2-node topology with two links between nodes.
(Enc) Packet Encapsulations: Eth-IPv4-ICMPv4 for L2 switching of IPv4.
(Cfg) DUT configuration: DUT1 and DUT2 are configured with L2 bridge-domain (L2BD) and Docker containers; MAC learning enabled and Split Horizon Groups (SHG) are set
depending on test case; Docker Containers with namespaces (NM) are set on DUT1.
(Ver) TG verification: Test ICMPv4 Echo Request packets are sent by TG on link to DUT1; On receipt TG verifies packets for correctness and their IPv4 src-addr, dst-addr and MAC addresses.
(Ref) Applicable standard specifications:

TC01: Tap Interface Simple BD
(Top) TG-DUT1-TG. (Enc) Eth-IPv4-ICMPv4.
(Cfg) On DUT1 configure two L2BD with two if's for each L2BD with MAC learning and one L2BD on docker container joining two linux-TAP interfaces created by VPP.
(Ver) Packet sent from TG is passed through all L2BD and received back on TG. Then src_ip, dst_ip and MAC are checked.
(Ref)

TC02: Tap Interface IP Ping
(Top) TG-DUT1-TG. (Enc) Eth-IPv4-ICMPv4.
(Cfg) On DUT1 configure two if's with IPv4 address ( dut_to_tg_if and TAP ) and one in docker container.
(Ver) Packet sent from TG gets to the destination and ICMP-reply is received on TG.
(Ref)

TC03: Tap Interface BD - Different Split Horizon
(Top) TG-DUT1-TG. (Enc) Eth-IPv4-ICMPv4.
(Cfg) On DUT1 configure one if into L2BD with MAC learning. Add two TAP interfaces into this L2BD and assign them different SHG. Setup two docker containers and assign two linux-TAP interfaces to it respectively.
(Ver) Packet is sent from TG to both linux-TAP interfaces and reply is checked. Ping from First linux-TAP to another should pass.
(Ref)

TC04: Tap Interface BD - Same Split Horizon
(Top) TG-DUT1-TG. (Enc) Eth-IPv4-ICMPv4.
(Cfg) On DUT1 configure one if into L2BD with MAC learning. Add two TAP interfaces into this L2BD and assign them same SHG. Setup two docker containers and assign two linux-TAP interfaces to it respectively.
(Ver) Packet is sent from TG to both linux-TAP interfaces and reply is checked. Ping from First linux-TAP to another should fail.
(Ref)

TC05: Tap Interface Modify And Delete
(Top) TG-DUT1-TG. (Enc) Eth-IPv4-ICMPv4.
(Cfg) Set two TAP interfaces.
(Ver) Verify that TAP interface can be modified, deleted and no other TAP interface is affected.
(Ref)