Is sniffer cpu-port forbidden?

RouterOS Beginner Basics
1

I try to sniffer cpu-port in RB4011 , it says

[admin@MikroTik] > /tool/sniffer/start interface=switch2-cpu
input does not match any value of interface

i tried sniffer in normal port , it works

[admin@MikroTik] > /tool/sniffer/start interface=ether8
[admin@MikroTik] > /tool/sniffer/stop



[admin@MikroTik] > /interface ethernet switch port print
Flags: R - RUNNING
Columns: NAME, SWITCH

NAME SWITCH

0 ether1 switch1
1 R ether2 switch1
2 ether3 switch1
3 ether4 switch1
4 ether5 switch1
5 ether6 switch2
6 ether7 switch2
7 R ether8 switch2
8 ether9 switch2
9 ether10 switch2
10 switch1-cpu switch1
11 switch2-cpu switch2

2

switchX-cpu is a switch port and doesn’t exist outside of /interface/ethernet/switch scope. Ether ports are (in ROS) different as ROS does have capability to work with individual switched ports (as if they were stand-alone interfaces).

If you have a bridge and has any of there ports (run by that particular switch chip) set as members, then sniffing off associated bridge interface might show that traffic.