cable length test

RouterOS General
1

I’ve got mikrotik rb951g-2hnd, firmware is updated, routeros 6.4
There’s a feature in wiki - cable-test. It is described like this:

[admin@CCR] > interface ethernet cable-test ether1
         name: ether1
       status: no-link
  cable-pairs: open:4,open:4,open:4,open:4

But as I run similar command on my device, I get:

[admin@MikroTik] > interface ethernet cable-test 1
    name: eth02_lan
  status: link-ok
-- [Q quit|D dump|C-z pause]

Why can’t I see more detailed info?

2

Hi,
I am getting same as you.

3

But

interface ethernet cable-test ether1

is working fine.

4

I’ve tried to call it by name - same thing.

[admin@MikroTik] > interface print                                       
Flags: D - dynamic, X - disabled, R - running, S - slave 
 #     NAME                             TYPE         MTU L2MTU  MAX-L2MTU
 0  R  eth01_internet			ether       1500  1598       4074
 1   S eth02_lan			ether       1500  1598       4074
 2  RS eth03_lan			ether       1500  1598       4074
 3  RS eth04_lan			ether       1500  1598       4074
 4  RS eth05_lan			ether       1500  1598       4074
 5  RS ;;; Wireless
       wlan1				wlan        1500  2290
 6  R  bridge-local			bridge      1500  1598

[admin@MikroTik] > interface ethernet cable-test eth01_internet
    name: eth01_internet
  status: link-ok
-- [Q quit|D dump|C-z pause]

Am I missing something?

5

I’m guessing they removed the more complete testing facility on low price hardware to shave cost (or its not supported in the cheap switch chips they use). My 951g-2hnd reports the same as yours, as well as my RB2011. If you notice, the login prompt next to the more thorough report says admin@CCR (“top” of the line).

6

I think vendor might describe this limitation in wiki.

7

It works only if there is no link. Run this command, disconnect cable and you will see the difference in output.

8

Well, it changes to

  status: no-link

But still no signs of cable length.
This is really strange, since even basic modern integrated NIC can diagnose broken pairs, cable length and so on.

9

According to: http://wiki.mikrotik.com/wiki/Manual:Switch_Chip_Features
“Atheros8327 is present on RB2011 series(ether1-ether5+sfp1) RB750GL, RB751G-2HnD, RB951G-2HnD and RB1100AH, RB1100AHx2(ether1-ether5, ether6-ether10).”

Your device RB951G-2HnD has the same switch chip as the one I’ve tested (RB2011UAS-2HnD), so this function should work. Report it to: support@mikrotik.com

10

I’ve got a reply from techsupport - they are going to fix this in next RouterOS release.

11

Wasn’t fixed in latest ROS release… big surprise…

12

Guy at tech support is surprised also =)

13

In fact in works, but ONLY if something’s wrong with the link.
run the command and unplug the cable, see for yourself =)

Kinda weird, but still.

14

I needed to move to firmware 3.10 it seems…

15

Mine is 3.08, but 3.10 is available.

16

I also encountered this problem about 8 years later, which surprised me.
I want to know where the problem is.

17

I had same problem. I find solution, cable length can be seen only via winbox.
I could not see it via cmd or webfig.

18

To see more detailed info, just press the space bar on your keyboard