# tcpdump -enXXi $host_dsa_interface

Here's an example ping packet received over the vlan with the above
configuration, captured from the host DSA interface (ether mac
addresses obfuscated):

        0x0000:  DDDD DDDD DDDD SSSS SSSS SSSS dada 0000  .PC.....[h:.....
                                               ^^^^^^^^^
        0x0010:  c020 0000 8100 0080 0800 4500 0054 ec40  ..........E..T.@
                 ^^^^^^^^^ ^^^^^^^^^ ^^^^
        0x0020:  4000 4001 c314 c0a8 0502 c0a8 0501 0800  @.@.............
        0x0030:  8784 0c85 0001 32c8 0c5e 0000 0000 59fc  ......2..^....Y.
        0x0040:  0c00 0000 0000 1011 1213 1415 1617 1819  ................
        0x0050:  1a1b 1c1d 1e1f 2021 2223 2425 2627 2829  .......!"#$%&'()
        0x0060:  2a2b 2c2d 2e2f 3031 3233 3435 3637       *+,-./01234567

dada 0000 c020 0000	- EDSA tag
8100 0080		- VLAN ethertype, vlan id
0800			- IPv4 ethertype, and what follows is the ipv4
			  packet.

That way it would be possible to know whether the DSA switch is
forwarding the packets, and in what manner it's forwarding them.

Hi Russell

Try upgrading your tcpdump and pcap library. It now understands DSA
headers, will dump them in a semi human readable way, and also the
rest of the frame.

     Andrew