port mirroring can't sniffer all packets

I set the port mirroring on RB 750GL. It can work.

But I find the wireshark at the target port that only capture partial packets.

I only capture the send out packets , can’t capture the received packets.

What’s the issue ?



RB 750GL : version 6.19

[admin@MikroTik] /interface ethernet switch> print
Flags: I - invalid

NAME TYPE MIRROR-SOURCE MIRROR-TARGET SWITCH-ALL-PORTS

0 switch1 Atheros-8327 ether5-slave-local ether2-master-local
[admin@MikroTik] /interface ethernet switch> port
[admin@MikroTik] /interface ethernet switch port> print
Flags: I - invalid

NAME SWITCH VLAN-MODE VLAN-HEADER DEFAULT-VLAN-ID

0 ether1-gateway switch1 disabled leave-as-is auto
1 ether2-master-local switch1 disabled leave-as-is auto
2 ether3-slave-local switch1 disabled leave-as-is auto
3 ether4-slave-local switch1 disabled leave-as-is auto
4 ether5-slave-local switch1 disabled leave-as-is auto
5 switch1-cpu switch1 disabled leave-as-is auto