Mikrotik CRS226-24G-2S+RM and Mikrotik S+85DLC03D issues

Hi all,

We have the following scenario:

1 CRS226-24G-2S+RM + 1 S+85DLC03D - Switch A
1 CRS226-24G-2S+RM + 1 S+85DLC03D - Switch B
1 CRS226-24G-2S+RM + 2 S+85DLC03D - Switch C

Thay are all with latest software version (6.28)

They are all joined with fiber. A to C (40mts Fiber) and B to C (5mts Fiber), using, in router C, the two SFP ports.

The Problem:

Almost Every hour the Switch C losses connection with Switch A, and always with Switch A. The connection with B is always up.
In the log we only can see “interface,info sfpplus2-slave-local link down”, with no more messages.

09:32:13 interface,info sfpplus2-slave-local link down
09:34:36 system,info device changed by admin
09:34:41 system,info device changed by admin
09:34:42 interface,info sfpplus2-slave-local link up (speed 10G, full duplex)
09:51:28 system,info,account user admin logged in from 192.168.1.201 via telnet
09:56:12 system,info device changed by admin
09:56:28 system,info device changed by admin
10:07:13 system,info,account user admin logged out from 192.168.1.201 via telnet
10:07:13 system,info,account user admin logged out from 192.168.1.201 via winbox
10:07:13 system,info,account user admin logged out from 192.168.1.201 via telnet
10:07:25 system,info,account user admin logged in from 192.168.1.201 via winbox
10:15:21 interface,info sfpplus2-slave-local link down
10:16:18 system,info device changed by admin
10:16:23 system,info device changed by admin
10:16:25 interface,info sfpplus2-slave-local link up (speed 10G, full duplex)
10:16:42 system,info,account user admin logged in from 192.168.1.201 via telnet
10:17:00 script,info

One strange behaviour is that in the SFP stats in the interface we loose all the information (vendor, model, connector type, etc…) they all apear blank. This happened minutes before the interface went down.

To revcover the conexion we have to disabel-enable the interface.

Have someone the same or similar issue??

Thanks in advance.

Hi again,

Self response.

Downgrade all the switches to routeros 6.27. Same results.

Downgrade all to 6.26. Works Perfect!!!. No downs and zero problems.

Maybe there is a problem with latest firmwares and SFP ports.

The speed in the SFP ports now is quite better and after almost 3 days of operation no issue appears.