---
vswitchd/vswitch.xml | 16 ++++++++++++----
1 files changed, 12 insertions(+), 4 deletions(-)
diff --git a/vswitchd/vswitch.xml b/vswitchd/vswitch.xml
index b3029eb..e4efa99 100644
--- a/vswitchd/vswitch.xml
+++ b/vswitchd/vswitch.xml
@@ -1656,10 +1656,14 @@
<column name="output_port">
<p>Output port for selected packets, if nonempty.</p>
<p>Specifying a port for mirror output reserves that port exclusively
- for mirroring. No frames other than those selected for mirroring
- will be forwarded to the port, and any frames received on the port
- will be discarded.</p>
- <p>This type of mirroring is sometimes called SPAN.</p>
+ for mirroring. No frames other than those selected for mirroring
+ will be forwarded to the port, and any frames received on the port
+ will be discarded.</p>
+ <p>
+ The output port may be any kind of port supported by Open vSwitch.
+ It may be, for example, a physical port (sometimes called SPAN), or a
+ GRE tunnel (sometimes called ERSPAN).
+ </p>
</column>
<column name="output_vlan">
@@ -1727,6 +1731,10 @@
Open vSwitch is being used as an intermediate switch, learning can be
disabled by adding the mirrored VLAN to <ref column="flood_vlans"/>
in the appropriate <ref table="Bridge"/> table or tables.</p>
+ <p>
+ Mirroring to a GRE tunnel has fewer caveats than mirroring to a
+ VLAN and should generally be preferred.
+ </p>
</column>
</group>
--
1.7.4.4
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