X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=FAQ;h=a08d65c23b240e68c4e288ff845547ee4d92581d;hb=2d04b6ea214daf96020ce5ca994fcb5380556247;hp=75d9e6b769dd0f652b9ecc454b081491c6c095f6;hpb=1e827902be9194d71ea851c9ce2676f65eeed33a;p=sliver-openvswitch.git

diff --git a/FAQ b/FAQ
index 75d9e6b76..a08d65c23 100644
--- a/FAQ
+++ b/FAQ
@@ -1111,6 +1111,27 @@ A: Open vSwitch 1.9 and earlier support only OpenFlow 1.0 (plus
    When support for a given OpenFlow version is solidly implemented,
    Open vSwitch will enable that version by default.
 
+Q: Does Open vSwitch support MPLS?
+
+A: Before version 1.11, Open vSwitch did not support MPLS.  That is,
+   these versions can match on MPLS Ethernet types, but they cannot
+   match, push, or pop MPLS labels, nor can they look past MPLS labels
+   into the encapsulated packet.
+
+   Open vSwitch versions 1.11, 2.0, and 2.1 have very minimal support
+   for MPLS.  With the userspace datapath only, these versions can
+   match, push, or pop a single MPLS label, but they still cannot look
+   past MPLS labels (even after popping them) into the encapsulated
+   packet.  Kernel datapath support is unchanged from earlier
+   versions.
+
+   Open vSwitch version 2.2 will be able to match, push, or pop up to
+   3 MPLS labels.  Looking past MPLS labels into the encapsulated
+   packet will still be unsupported.  Both userspace and kernel
+   datapaths will be supported, but MPLS processing always happens in
+   userspace either way, so kernel datapath performance will be
+   disappointing.
+
 Q: I'm getting "error type 45250 code 0".  What's that?
 
 A: This is a Open vSwitch extension to OpenFlow error codes.  Open