On Sun, Apr 16, 2017 at 11:30:33AM +0000, Ali Volkan Atli wrote:
> I am trying to understand auxiliary connection according to OpenFlow 1.5
> specifications but I have some questions as follows
>
> 1) Let's suppose I have one main and one auxiliary connection. How
> does the controller decide (or force) which connection to use for
> sending packet-in messages?
The OpenFlow specification says:
The controller is free to use the various switch connections for
sending OpenFlow messages at its entire discretion, however to
maximise performance on most switches the following guidelines are
suggested:
• All OpenFlow controller requests which are not Packet-out
(flow-mod, statistic request...) should be sent over the main
connection.
• Connection maintenance messages (hello, echo request, features
request) should be sent on the main connection and on each auxiliary
connection as needed.
• All Packet-Out messages containing a packet from a Packet-In
message should be sent on the connection where the Packet-In came
from.
• All other Packet-Out messages should be spread across the various
auxiliary connections using a mechanism keeping the packets of a
same flow mapped to the same connection.
• If the desired auxiliary connection is not available, the
controller should use the main connection.
> 2) If the switch will decide, how will it decide? In one case, if
> there is an auxiliary connection, then -by default- all packet-ins are
> sent over "only" the aux channel? Is this correct behavior?
The OpenFlow specification says:
The switch is free to use the various controller connections for
sending OpenFlow messages as it wishes, however the following
guidelines are suggested :
• All OpenFlow messages which are not Packet-in should be sent over
the main connection.
• All Packet-In messages spread across the various auxiliary
connection using a mechanism keeping the packets of a same flow
mapped to the same connection.
> 3) If there are multiple auxiliary connections, should the switch
> spread across the various auxiliary connection (for example for load
> balancing)
Same question applies.
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