Comment 0 for bug 1639273

with a liberty openstack installation (openvswitch 2.4.1-0ubuntu0.15.10.1~cloud0) with two VMs, when vm1's interface is mirrored to vm2's interface, only vm1's egress traffic is mirrored; ingress traffic does not appear on vm2's interface.

ubuntu@machine-15:~$ sudo ovs-vsctl list mirror
ubuntu@machine-15:~$ sudo ovs-vsctl -- set Bridge br-int mirrors=@m -- --id=@qvo07e7496c-a1 get Port qvo07e7496c-a1 -- --id=@qvo91feef0f-f9 get Port qvo91feef0f-f9 -- --id=@m create Mirror name=mirror3 select-src-port=@qvo07e7496c-a1 select-dst-port=@qvo07e7496c-a1 output-port=@qvo91feef0f-f9
7e9e725f-1d23-4b30-8e46-82f7f7e71353
ubuntu@machine-15:~$ sudo ovs-vsctl list mirror
_uuid : 7e9e725f-1d23-4b30-8e46-82f7f7e71353
external_ids : {}
name : "mirror3"
output_port : a0e92620-37dd-4fd6-b514-45d47526306a
output_vlan : []
select_all : false
select_dst_port : [cafc190f-e89a-4f2c-ab56-2072351bbe41]
select_src_port : [cafc190f-e89a-4f2c-ab56-2072351bbe41]
select_vlan : []
statistics : {}

ubuntu@machine-15:~$ ping -c 1 10.5.150.3
PING 10.5.150.3 (10.5.150.3) 56(84) bytes of data.
64 bytes from 10.5.150.3: icmp_seq=1 ttl=63 time=4.26 ms

--- 10.5.150.3 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 4.268/4.268/4.268/0.000 ms

on vm 1 both directions appear, as expected:

17:16:13.093469 IP 10.5.2.1 > 192.168.21.7: ICMP echo request, id 9031, seq 1, length 64
17:16:13.094792 IP 192.168.21.7 > 10.5.2.1: ICMP echo reply, id 9031, seq 1, length 64

on vm 2 only outgoing traffic is mirrored:

17:16:13.095066 IP 192.168.21.7 > 10.5.2.1: ICMP echo reply, id 9031, seq 1, length 64