From a7a31d2d180d36bcbc6e92d44f2a5d7ab4f9b5e5 Mon Sep 17 00:00:00 2001 From: Jesse Gross Date: Tue, 29 Sep 2009 11:02:04 -0700 Subject: [PATCH] Document issues with RSPAN and MAC learning. Bug #2118 --- vswitchd/ovs-vswitchd.conf.5.in | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/vswitchd/ovs-vswitchd.conf.5.in b/vswitchd/ovs-vswitchd.conf.5.in index 12fea6c3c..e1c12f1df 100644 --- a/vswitchd/ovs-vswitchd.conf.5.in +++ b/vswitchd/ovs-vswitchd.conf.5.in @@ -282,7 +282,14 @@ correctly pointed to port 1, with one that incorrectly points to port the end host to the Open vSwitch on port 2, instead of to the end host on port 1, disrupting connectivity. If mirroring to a VLAN is desired in this scenario, then the physical switch must be replaced by one -that learns Ethernet addresses on a per-VLAN basis. +that learns Ethernet addresses on a per-VLAN basis. In addition, +learning should be disabled on the VLAN containing mirrored traffic. +If this is not done then the intermediate switch will learn the MAC +address of each end host from the mirrored traffic. If packets being +sent to that end host are also mirrored, then they will be dropped +since the switch will attempt to send them out the input port. +Disabling learning for the VLAN will cause the switch to correctly +send the packet out all ports configured for that VLAN. .ST "Example" The following \fBovs\-vswitchd\fR configuration copies all frames received on \fBeth1\fR or \fBeth2\fR to \fBeth3\fR. -- 2.43.0