Signed-off-by: Ben Pfaff <[email protected]>
---
FAQ.md | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/FAQ.md b/FAQ.md
index 29b2e19..15056b0 100644
--- a/FAQ.md
+++ b/FAQ.md
@@ -1979,6 +1979,25 @@ A: When a switch sends a packet to an OpenFlow
controller using a
buffering that the OpenFlow specification requires implementations
to document.
+### Q: How does OVS divide flows among buckets in an OpenFlow "select" group?
+
+A: In Open vSwitch 2.3 and earlier, Open vSwitch used the destination
+ Ethernet address to choose a bucket in a select group.
+
+ Open vSwitch 2.4 and later by default hashes the source and
+ destination Ethernet address, VLAN ID, Ethernet type, IPv4/v6
+ source and destination address and protocol, and for TCP and SCTP
+ only, the source and destination ports. The hash is "symmetric",
+ meaning that exchanging source and destination addresses does not
+ change the bucket selection.
+
+ Select groups in Open vSwitch 2.4 and later can be configured to
+ use a different hash function, using a Netronome extension to the
+ OpenFlow 1.5+ group_mod message. For more information, see
+ Documentation/group-selection-method-property.txt in the Open
+ vSwitch source tree. (OpenFlow 1.5 support in Open vSwitch is still
+ experimental.)
+
Development
-----------
--
2.1.3
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