[ovs-discuss] Flow Monitoring

Vasu Dasari vdasari at gmail.com
Thu May 23 20:37:41 UTC 2019


There are two "flags" fields in tcpdump output I shared earlier.
1. First one is 0 which is part of OFPT_MULTIPART_REQUEST, saying there are
no more parts. This is first two bytes in row 0040
2. And second one is "00 01" and it is indicating to receive "add"
notifications. And these are 2nd two bytes in row 0050.

Can you tell which bytes do you think are representing "flags" field in
above bytes output?

You can open the pcap file in Wireshark to see my analysis.

Also, is there a specification for nicera extensions? Can you please point
it to me?

-Vasu
*Vasu Dasari*


On Thu, May 23, 2019 at 4:17 PM Ben Pfaff <blp at ovn.org> wrote:

> On Wed, May 22, 2019 at 01:30:19PM -0400, Vasu Dasari wrote:
> > Here is the data:
> >
> > Request:
> > 0000   02 42 ac 18 00 02 02 42 c7 b9 8f ef 08 00 45 00  .B.....B......E.
> > 0010   00 50 22 94 00 00 25 06 c5 4f c0 a8 41 02 ac 18  .P"...%..O..A...
> > 0020   00 02 19 fe d4 22 1a fe f8 dd a4 5c 18 1d 50 18  .....".....\..P.
> > 0030   ff ff 57 23 00 00 05 12 00 28 00 00 00 00 00 10  ..W#.....(......
> > 0040   00 00 00 00 00 00 05 f5 e1 00 00 00 00 00 ff ff  ................
> > 0050   ff ff 00 01 00 00 00 01 00 04 00 00 00 00        ..............
>
> This request has a flags word of 0.  The flags word has to request
> notifications for at least one of add or delete or modify operations,
> otherwise there's no point since no notifications would ever occur.
> Therefore, OVS rejects the request.
>
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