[ovs-discuss] ovs-ofctl broken when getting table features reply

[Ben Pfaff]

On Mon, Jan 04, 2021 at 11:13:53AM +0800, Dickens Yeh wrote:
> Hi,
> When I using the ovs-ofctl utility tool to dump flows from a
> non-openvswitch switch without --no-names parameter, and I got error
> message.
> 
> cmd:
> 
> ~/openvswitch-2.13.1/utilities/ovs-ofctl -O OpenFlow13 dump-flows tcp:
> 192.168.17.166:6644
> 
> msg:
> 2020-12-31T10:12:22Z|00001|ofp_table|WARN|table features message missing
> required property
> ovs-ofctl: received bad reply: (***only uses 512 bytes out of 7056***)
> 00000000  04 50 02 00 00 00 00 00-6e 6f 76 69 5f 74 61 62 |.P......novi_tab|
> 00000010  6c 65 5f 32 00 00 00 00-00 00 00 00 00 00 00 00 |le_2............|
> ...
> 
> I also attached the pcap file, please tell me if the switch should be fixed
> with the reply messages.

I ran "ovs-ofctl ofp-parse-pcap dump-error.pcap 6644" and got only the
following output:

    192.168.13.141.52476 > 192.168.17.166.6644:
    OFPT_HELLO (OF1.3) (xid=0x1):
     version bitmap: 0x04

    192.168.13.141.52476 > 192.168.17.166.6644:
    OFPST_FLOW request (OF1.3) (xid=0x2):

    192.168.13.141.52478 > 192.168.17.166.6644:
    OFPT_HELLO (OF1.3) (xid=0x3):
     version bitmap: 0x04

    192.168.13.141.52478 > 192.168.17.166.6644:
    OFPST_TABLE_FEATURES request (OF1.3) (xid=0x4):

I don't think the table features reply is in the pcap.