Good day list -
I'm observing some interesting behavior when mirroring a patch virtual
device. I have two bridges, br-tun and xapi1 (integration bridge),
connected via a patch. When I create a mirror on xapi1 to monitor
patch-tun (the patch's port on xapi1) I observe only egress traffic.
With the setup, I expect to observe both ingress and egress.
The bridge is created in the following manner:
ip link add name snoop0 type dummy
ip link set dev snoop0 up
ovs-vsctl add-port xapi1 snoop0
ovs-vsctl -- set Bridge xapi1 mirrors=@m \
-- --id=@snoop get Port snoop0 \
-- --id=@patch get Port patch-tun \
-- --id=@n create Bridge name=patchmirror select-dst-port=@patch
select-src-port=@patch output-port=@snoop
ovs-vsctl list Mirror
_uuid : 97e806bc-b12b-45e6-a2bc-65dcf8034a4e
external_ids : {}
name : patchmirror
output_port : 67ef2779-515f-44d6-b2f6-d671d098e5ea
output_vlan : []
select_all : false
select_dst_port : [9403ddee-85c7-44af-bb33-25401ba00126]
select_src_port : [9403ddee-85c7-44af-bb33-25401ba00126]
select_vlan : []
statistics : {tx_bytes=304112, tx_packets=1634}
and when I tcpdump -ni snoop0, I only see traffic destined to the patch,
but not sourced.
The version of software is
ovs-vsctl (Open vSwitch) 2.1.3
Compiled Sep 15 2014 05:43:35
running on XenServer Creedence Beta 3 (linux kernel version 3.10.0+2).
The current work around is to create an Open Flow rule to duplicate the
traffic.
~ Tom
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