Signed-off-by: Justin Pettit <jpet...@nicira.com>
---
FAQ | 35 +++++++++++++++++++++++++++++++++++
1 files changed, 35 insertions(+), 0 deletions(-)
diff --git a/FAQ b/FAQ
index 0e7713b..177f992 100644
--- a/FAQ
+++ b/FAQ
@@ -283,6 +283,41 @@ A: No. ERSPAN is an undocumented proprietary protocol.
As an
alternative, Open vSwitch supports mirroring to a GRE tunnel (see
above).
+Q: Why are there so many different ways to dump flows?
+
+A: There are four different ways to look at the flow tables in Open
+ vSwitch. The fall into two categories: userspace flows and datapath
+ flows.
+
+ Userspace flows are the ones that define the switch's policy. They
+ support wildcards, priorities, and multiple tables. They are often
+ called the OpenFlow rules and may be configured by a controller or
+ ovs-ofctl utility. There are two ways to look at these userspace
+ flows:
+
+ - "ovs-ofctl dump-flows <br>" dumps the user-visible flows. This
+ is the most common method to look at flow table entries.
+
+ - "ovs-appctl bridge/dump-flows <br>" dumps both the user-visible
+ and "hidden" flows. Hidden flows are set up by Open vSwitch
+ itself to implement local policies. These flows are higher
+ priority than can be configured by a controller or user. There
+ is more discussion about hidden flows in the "Controller"
+ section below.
+
+ Datapath flows are much simpler exact-match entries for efficient
+ lookup. These commands are primarily useful for debugging Open
+ vSwitch, since they are simply a cache of recently seen traffic.
+ There are two ways to look at these datapath flows:
+
+ - "ovs-dpctl dump-flows [dp]" dumps the flow table entries for a
+ datapath instance. If multiple bridges of the same type
+ exist, then the flows from all bridges of that type will be
+ shown.
+
+ - "ovs-appctl dpif/dump-flows <br>" dumps the datapath flows for
+ only the specified bridge, regardless of the type.
+
Configuration Problems
----------------------
--
1.7.5.4
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