X-Git-Url: http://git.cascardo.eti.br/?p=cascardo%2Fovs.git;a=blobdiff_plain;f=FAQ.md;h=8bd7ab9190332934b24f015f39db2c811522b813;hp=22c923ffecfbed3b9f25ac19bf6c73ad6db5da68;hb=HEAD;hpb=d05293afdd47b27e672a578705ed7d53db29d04a

diff --git a/FAQ.md b/FAQ.md
index 22c923ffe..8bd7ab919 100644
--- a/FAQ.md
+++ b/FAQ.md
@@ -197,7 +197,7 @@ Feature               | Linux upstream | Linux OVS tree | Userspace | Hyper-V |
 Connection tracking   |      4.3       |       3.10     |    NO     |   NO    |
 Tunnel - LISP         |      NO        |       YES      |    NO     |   NO    |
 Tunnel - STT          |      NO        |       3.5      |    NO     |   YES   |
-Tunnel - GRE          |      3.11      |       YES      |    YES    |   NO    |
+Tunnel - GRE          |      3.11      |       YES      |    YES    |   YES   |
 Tunnel - VXLAN        |      3.12      |       YES      |    YES    |   YES   |
 Tunnel - Geneve       |      3.18      |       YES      |    YES    |   NO    |
 QoS - Policing        |      YES       |       YES      |    NO     |   NO    |
@@ -222,7 +222,7 @@ Multiple VTEPs        |      YES       |       YES      |    YES    |   NO    |
 Feature               | Linux upstream | Linux OVS tree | Userspace | Hyper-V |
 ----------------------|:--------------:|:--------------:|:---------:|:-------:|
 SCTP flows            |      3.12      |       YES      |    YES    |   YES   |
-MPLS                  |      3.19      |       YES      |    YES    |   NO    |
+MPLS                  |      3.19      |       YES      |    YES    |   YES   |
 UFID                  |      4.0       |       YES      |    YES    |   NO    |
 Megaflows             |      3.12      |       YES      |    YES    |   NO    |
 Masked set action     |      4.0       |       YES      |    YES    |   NO    |
@@ -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
 -----------