[pox-dev] Set Priority on Flow Rules

[Murphy McCauley]

In plain OpenFlow 1.0, this isn't possible because l2_learning installs exact matches, which have maximum priority.  There are at least two ways to fix this:

1) Don't install exact matches for normal learning.  This is pretty reasonable, actually.  l2_pairs, for example, installs rules that just match Ethernet addresses.  These matches can be at whatever priority you want.

2) If you're using a switch which has Nicira extensions (e.g., Open vSwitch), you can take advantage of multiple tables.  Have l2_learning install its entries into table 1.  Put a low priority wildcard entry into table 0 that just resubmits to table 1.  So "normal" traffic will hit that wildcard entry and go to table 1 and then be processed as usual.  Then put whatever "exceptional" entries you want in table 0 too.  They'll always be matched before the ones installed into table 1.

-- Murphy

On Jun 28, 2015, at 5:59 PM, Talal Alharbi <tal012 at hotmail.com> wrote:

> I have already looked at it before and did not work because I need higher priority than rules installed by l2_learning after ping.   
> From: sul4bh at gmail.com
> Date: Sun, 28 Jun 2015 20:19:31 -0400
> Subject: Re: [pox-dev] Set Priority on Flow Rules
> To: tal012 at hotmail.com
> CC: pox-dev at lists.noxrepo.org
> 
> You can find some clues in the documentation here: https://openflow.stanford.edu/display/ONL/POX+Wiki#POXWiki-OpenFlowMessages
> 
> Straight from the documentation:
> "priority (int) - the priority at which a rule will match, higher numbers higher priority. Note: Exact matches will have highest priority."
> 
> On Sun, Jun 28, 2015 at 8:12 PM, Talal Alharbi <tal012 at hotmail.com> wrote:
> Dear All, 
> 
> I need to a high priority to the rules I would like to preformed first. I have tried different values but none of them work. Could you please advise me ?
> 
> Cheers, 
> Talal

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