On Tue, Jun 30, 2015 at 09:48:12AM -0700, Xuemei Liu wrote:
> I want to generate forwarding rules for ovs, and need to get the port id
> (0, 1, ...) at the ovs from the port name (eth0, ...). I tried ovs-vsctl
> show, ovs-dpctl show, but they don't show the port id. Could anyone tell me
> the commands to implement this task?
This is in the FAQ.
### 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).
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