I might be wrong, but from my understanding there is nothing in
OpenFlow that dictates reliable execution of commands received.
I would also prefer an error, but which one would your switch send for
being too busy? This is the 6 I know of.
OFPET_HELLO_FAILED, /* Hello protocol failed. */
OFPET_BAD_REQUEST, /* Request was not understood. */
OFPET_BAD_ACTION, /* Error in action description. */
OFPET_FLOW_MOD_FAILED, /* Problem modifying flow entry. */
OFPET_PORT_MOD_FAILED, /* Port mod request failed. */
OFPET_QUEUE_OP_FAILED /* Queue operation failed. */
and bad request has the following subtype
OFPBRC_BAD_VERSION, /* ofp_header.version not supported. */
OFPBRC_BAD_TYPE, /* ofp_header.type not supported. */
OFPBRC_BAD_STAT, /* ofp_stats_request.type not supported. */
OFPBRC_BAD_VENDOR, /* Vendor not supported (in
ofp_vendor_header
* or ofp_stats_request or ofp_stats_reply). */
OFPBRC_BAD_SUBTYPE, /* Vendor subtype not supported. */
OFPBRC_EPERM, /* Permissions error. */
OFPBRC_BAD_LEN, /* Wrong request length for type. */
OFPBRC_BUFFER_EMPTY, /* Specified buffer has already been used. */
OFPBRC_BUFFER_UNKNOWN /* Specified buffer does not exist. */
Regards
KK
On 8 March 2010 21:27, Ben Pfaff <[email protected]> wrote:
> On Mon, Mar 08, 2010 at 09:23:19PM -0800, kk yap wrote:
>> > 4) Do stats request messages time out? If so is there a way to be
>> > notified of the time out?
>>
>> Not that I know of. In OpenFlow, it is perfectly valid for a switch
>> to decide that it cannot handle the stat request and discard it.
>
> Is that so? I would expect a switch implementation to at least send
> back an error response, if it cannot handle a statistics request.
>
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