From 92ada13254cbbc24ded4c9970d73dac1fe2f10d9 Mon Sep 17 00:00:00 2001 From: Ben Pfaff Date: Mon, 8 Aug 2011 10:17:30 -0700 Subject: [PATCH] Document that mirroring to a GRE tunnel works and is better than RSPAN. --- vswitchd/vswitch.xml | 24 ++++++++++++++++-------- 1 file changed, 16 insertions(+), 8 deletions(-) diff --git a/vswitchd/vswitch.xml b/vswitchd/vswitch.xml index b3029eb2..bcabef56 100644 --- a/vswitchd/vswitch.xml +++ b/vswitchd/vswitch.xml @@ -1610,12 +1610,12 @@ - +

A port mirror within a .

A port mirror configures a bridge to send selected frames to special - ``mirrored'' ports, in addition to their normal destinations. Mirroring - traffic may also be referred to as SPAN or RSPAN, depending on the - mechanism used for delivery.

+ ``mirrored'' ports, in addition to their normal destinations. Mirroring + traffic may also be referred to as SPAN, RSPAN, or ERSPAN, depending on how + the mirrored traffic is sent.

Arbitrary identifier for the . @@ -1656,10 +1656,14 @@

Output port for selected packets, if nonempty.

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.

-

This type of mirroring is sometimes called SPAN.

+ 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.

+

+ 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). +

@@ -1727,6 +1731,10 @@ Open vSwitch is being used as an intermediate switch, learning can be disabled by adding the mirrored VLAN to in the appropriate table or tables.

+

+ Mirroring to a GRE tunnel has fewer caveats than mirroring to a + VLAN and should generally be preferred. +

-- 2.30.2