Thanks, I'll give that a read.
What do you think about identical flows with no wildcards but different
priorities? I notice that open vswitch just sets the priority to 65535
for exact flows. Should identical flows with different priorities also
be allowed?
- Derek
On 02/22/2011 04:20 PM, Justin Pettit wrote:
Yes, I was using some poetic license in saying that we lost; that flag was put
in there as a sort of compromise for those of us not in favor of always
enforcing that behavior. If you're really interested, you can see some of the
discussion starting here:
https://mailman.stanford.edu/pipermail/openflow-dev/2008-April/000133.html
--Justin
On Feb 21, 2011, at 11:03 PM, Romain Lenglet wrote:
Hi,
I thought that accepting (or not) overlapping flows at the same priority was up
to the controller?
Isn't that what the check_overlap flag is for in flow_mod messages?
--
Romain Lenglet
On Tuesday, February 22, 2011 at 16:00, Justin Pettit wrote:
I would expect so. One use that people have brought in the past is that you
could setup backup routes at a lower priority, with the higher ones timing out
or being forcibly removed. I don't know how useful that actually is, but people
have discussed doingg that before with OpenFlow.
In general, Ben and I have been fairly negative in the OpenFlow discussions about putting
in "sanity" checks at flow insertion time due to the complexity and expense of
enforcing them. There was quite a lengthy discussion a year or so back about preventing
users from being able to put overlapping flows at the same priority--we lost that one. :-)
--Justin
On Feb 21, 2011, at 10:52 PM, Derek Cormier wrote:
I expected that since the flow with the lower priority will never be matched
over the higher one, it has no purpose and would not be added.
Hmm, on second glance, the protocol says that if you add an identical flow that
also has the same priority then the flow will just be replaced.
But, I don't think it says anything about this case. Sorry, I should have
confirmed that before posting.
That said, do you think these identical flows should be allowed?
- Derek
On 02/22/2011 03:43 PM, Justin Pettit wrote:
I would expect that you can. What did you expect? What did you see? It's not
clear from this output if it's working or not, since neither couunter shows a
value. Are you running traffic?
--Justin
On Feb 21, 2011, at 10:35 PM, Derek Cormier wrote:
Should I be able to add two identical wildcarded flows with different
priorities? I was talking with KK and he thinks this might be a bug. I always
assumed this was just the way it works. Here is my ovs-ofctl flow dump:
cookie=0x0, duration=94.608s, table_id=0, n_packets=0, n_bytes=0,
priority=5,dl_type=0x0005 actions=drop
cookie=0x0, duration=98.109s, table_id=0, n_packets=0, n_bytes=0,
priority=1,dl_type=0x0005 actions=drop
Thanks,
- Derek
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