[pox-dev] help with priorities

[Murphy McCauley]

I think you're probably using l2_learning, which installs exact match table entries.  In OpenFlow, exact matches always have maximum priority -- you can't override it.

Here are some options for getting around the problem:
1. Make the "exceptional" table entries you install *also* be at maximum priority, overriding the ones that l2_learning installed.
2. If you're using Open vSwitch, use the multiple table extension.  Put your exceptional entries in table 0 and have l2_learning install into table 1.  Have a lowest-priority match-all entry in table 0 just submit to table 1.
3. Don't install exact matches to begin with; do something more like l2_pairs.

Good luck.

-- Murphy

On May 16, 2015, at 9:00 AM, Kostas Chartsias <kchartsias at yahoo.gr> wrote:

> another question and thanks for the support,Murphy you rule !!!
> 
> I modify the L2_switch and i install flow rules after an event accurs.Everything works fine,but there is a problem.
> When it behaves as normal switch it installs rules with maximum priority 65535 even though i set msg.priotiry a low value .It seams as i can't change the flows priority for the switch,so i have to wait until timeouts expire and the new flows from my event will work.Have you experienced similare thing with overlapping flow matches?
> 
> p.s. i used dpctl and i saw the flow of the switch always 65535,and the others with my lower priority
> 
> (i only added priority in the openflow mod message which installs flows,above default switch timeouts)
> 
> Thanks in advance!!!
> 

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