On Mon, Apr 20, 2015 at 02:33:00PM -0700, Justin Pettit wrote:
>
> > On Apr 18, 2015, at 10:04 AM, Ben Pfaff <[email protected]> wrote:
> >
> > + <column name="logical_datapath">
> > + The logical datapath to which the logical port belongs. A logical
> > + datapath implements a logical pipeline among the ports in the <ref
> > + table="Bindings"/> table associated with it. (No table represents a
> > + logical datapath.)
> > + </column>
>
> I agree with Russell's feedback. In addition, a datapath, in OVS
> terminology, has historically been a switch, but now we're including
> routers, so it feels like we're broadening the term. I think
> another sentence here and the architecture document describing a
> logical datapath would be useful.
Fair enough, I folded this in:
diff --git a/ovn/ovn-architecture.7.xml b/ovn/ovn-architecture.7.xml
index 9ed162b..ef5e5f4 100644
--- a/ovn/ovn-architecture.7.xml
+++ b/ovn/ovn-architecture.7.xml
@@ -254,6 +254,38 @@
another name may be used.
</p>
+ <h2>Logical Networks</h2>
+
+ <p>
+ A <dfn>logical network</dfn> implements the same concepts as physical
+ networks, but they are insulated from the physical network with tunnels or
+ other encapsulations. This allows logical networks to have separate IP and
+ other address spaces that overlap, without conflicting, with those used for
+ physical networks. Logical network topologies can be arranged without
+ regard for the topologies of the physical networks on which they run.
+ </p>
+
+ <p>
+ Logical network concepts in OVN include:
+ </p>
+
+ <ul>
+ <li>
+ <dfn>Logical switches</dfn>, the logical version of Ethernet switches.
+ </li>
+
+ <li>
+ <dfn>Logical routers</dfn>, the logical version of IP routers. Logical
+ switches and routers can be connected into sophisticated topologies.
+ </li>
+
+ <li>
+ <dfn>Logical datapaths</dfn> are the logical version of an OpenFlow
+ switch. Logical switches and routers are both implemented as logical
+ datapaths.
+ </li>
+ </ul>
+
<h2>Life Cycle of a VIF</h2>
<p>
diff --git a/ovn/ovn-sb.xml b/ovn/ovn-sb.xml
index 99c809a..c623cff 100644
--- a/ovn/ovn-sb.xml
+++ b/ovn/ovn-sb.xml
@@ -231,7 +231,10 @@
The logical datapath to which the logical port belongs. A logical
datapath implements a logical pipeline among the ports in the <ref
table="Bindings"/> table associated with it. (No table represents a
- logical datapath.)
+ logical datapath.) In practice, the pipeline in a given logical datapath
+ implements either a logical switch or a logical router, and
+ <code>ovn-northd</code> reuses the UUIDs for those logical entities from
+ the <code>OVN_Northbound</code> for logical datapaths.
</column>
<column name="table_id">
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