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[ARP test] can ARP test run on t0 topology? #481

@keboliu

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@keboliu

Regarding ARP test in the wiki it mentioned that it can run when it connected to a PTF testbed.

If we look into the test case, it's assigning IP address on Ethernet4 and Ethernet8, and expecting these two interfaces can response to the ARP request.

    - name: change SONiC DUT interface IP to test IP address
      command: /sbin/ifconfig  Ethernet4 10.10.1.2 netmask 255.255.255.240
      become: yes

    - name: change SONiC DUT interface IP to test IP address
      command: /sbin/ifconfig  Ethernet8 10.10.1.20 netmask 255.255.255.240
      become: yes

In the t0 configuration, Ethernet4 and Ethernet8 are untagged member ports of Vlan1000, will have issue if assign IP address to them.

    "VLAN_MEMBER": {
        "Vlan1000|Ethernet4": {
            "tagging_mode": "untagged"
        }, 
        "Vlan1000|Ethernet8": {
            "tagging_mode": "untagged"
        }, 

Shall we add restriction to this test that it is not able to run on t0?

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