I keep seeing this question.
Signed-off-by: Ben Pfaff <b...@nicira.com>
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FAQ | 37 +++++++++++++++++++++++++++++++++++++
1 files changed, 37 insertions(+), 0 deletions(-)
diff --git a/FAQ b/FAQ
index e7249cf..f8faa2f 100644
--- a/FAQ
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@@ -325,6 +325,43 @@ A: No. ERSPAN is an undocumented proprietary protocol.
As an
alternative, Open vSwitch supports mirroring to a GRE tunnel (see
above).
+Q: How do I connect two bridges?
+
+A: First, why do you want to do this? Two connected bridges are not
+ much different from a single bridge, so you might as well just have
+ a single bridge with all your ports on it.
+
+ If you still want to connect two bridges, you can use a pair of
+ patch ports. The follow example creates bridges br0 and br1, adds
+ eth0 and tap0 to br0, adds tap1 to br1, and then connects br0 and
+ br1 with a pair of patch ports.
+
+ ovs-vsctl add-br br0
+ ovs-vsctl add-port br0 eth0
+ ovs-vsctl add-port br0 tap0
+ ovs-vsctl add-br br1
+ ovs-vsctl add-port br1 tap1
+ ovs-vsctl \
+ -- add-port br0 patch0 \
+ -- set interface patch0 type=patch options:peer=patch1 \
+ -- add-port br1 patch1 \
+ -- set interface patch1 type=patch options:peer=patch0
+
+ Bridges connected with patch ports are much like a single bridge.
+ For instance, if the example above also added eth1 to br1, and both
+ eth0 and eth1 happened to be connected to the same next-hop switch,
+ then you could loop your network just as you would if you added
+ eth0 and eth1 to the same bridge (see the "Configuration Problems"
+ section below for more information).
+
+ If you are using Open vSwitch 1.9 or an earlier version, then you
+ need to be using the kernel module bundled with Open vSwitch rather
+ than the one that is integrated into Linux 3.3 and later, because
+ Open vSwitch 1.9 and earlier versions need kernel support for patch
+ ports. This also means that in Open vSwitch 1.9 and earlier, patch
+ ports will not work with the userspace datapath, only with the
+ kernel module.
+
Q: Why are there so many different ways to dump flows?
A: Open vSwitch uses different kinds of flows for different purposes:
--
1.7.2.5
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