Hello,
In OpenFlow protocol 1.0.0 the buffer_id variable is defined always to
be uint32_t.
It means that it is a chain of 32 bits that should be interpreted as an
integer number, whose value is nothing but the value of such a binary chain.
That's fine so far.
However, in numerous points of the protocol definition, it is said that
buffer_id can have the value -1. For instance, in OFPT_PACKET_OUT and
OFPT_PACKET_IN messages, it is stated that the value of buffer_id=-1
means that the packet data is carried within the message, and not buffered.
This is an incongruence, as buffer_id has bin defined as an unsigned
integer, therefore, it is not possible to represent -1 with the chain of
bits, unless the codification of this -1 is explicitely given, which is
not in the definition of OpenFlow protocol.
Therefore, how should a -1 look like?
Isn't it a flaw in the definition of this variable ?
Sincerely,
--
Jose Francisco Mingorance-Puga
ETH Zürich - Swiss Federal Institute of Technology Zurich
Computer Engeenering and Networks Laboratory
Communication Systems Group
ETZ G 94 Gloriastrasse 35
8092 Zürich Switzerland
Phone: +41 44 632 70 52
Skype name: jfmingorance
[email protected]
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