On Wed, Jul 11, 2012 at 12:57:20AM -0700, Justin Pettit wrote:
> On Jul 11, 2012, at 12:53 AM, Ben Pfaff wrote:
>
> > +Q: How can I figure out the port number for a given port?
>
> "Port number" is such an overloaded term that maybe we should be more
> specific. What about "OpenFlow port number"? Also, it may be useful
> that it distinguishes it from the datapath port numbers, too.
Good point. Here's a version that sprinkles "OpenFlow" around a bit:
--8<--------------------------cut here-------------------------->8--
From: Ben Pfaff <b...@nicira.com>
Date: Wed, 11 Jul 2012 00:58:53 -0700
Subject: [PATCH] FAQ: Add FAQ entry for determining OpenFlow port numbers.
I don't understand why, but I've had this question from multiple people
recently.
Signed-off-by: Ben Pfaff <b...@nicira.com>
---
FAQ | 27 +++++++++++++++++++++++++++
1 files changed, 27 insertions(+), 0 deletions(-)
diff --git a/FAQ b/FAQ
index a6dd568..4ad8c43 100644
--- a/FAQ
+++ b/FAQ
@@ -520,6 +520,33 @@ A: The term "normalization" in the log message means that
a flow
TCP source port 1234, write "tcp,tp_src=1234", or to match UDP
source port 1234, write "udp,tp_src=1234".
+Q: How can I figure out the OpenFlow port number for a given port?
+
+A: The OFPT_FEATURES_REQUEST message requests an OpenFlow switch to
+ respond with an OFPT_FEATURES_REPLY that, among other information,
+ includes a mapping between OpenFlow port names and numbers. From a
+ command prompt, "ovs-ofctl show br0" makes such a request and
+ prints the response for switch br0.
+
+ The Interface table in the Open vSwitch database also maps OpenFlow
+ port names to numbers. To print the OpenFlow port number
+ associated with interface eth0, run:
+
+ ovs-vsctl get Interface eth0 ofport
+
+ You can print the entire mapping with:
+
+ ovs-vsctl -- --columns=name,ofport list Interface
+
+ but the output mixes together interfaces from all bridges in the
+ database, so it may be confusing if more than one bridge exists.
+
+ In the Open vSwitch database, ofport value -1 means that the
+ interface could not be created due to an error. (The Open vSwitch
+ log should indicate the reason.) ofport value [] (the empty set)
+ means that the interface hasn't been created yet. The latter is
+ normally an intermittent condition (unless ovs-vswitchd is not
+ running).
Contact
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--
1.7.2.5
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