v6.47.2 issue

RouterOS General
1

Hi,

I am experiencing an issue with v6.47.2:
As it looks ethernet link handling on RB3011 has problems.

What I did: Upgrade RB3011 from v6.47.1 to v6.47.2
What happened: RB3011 became unreachable
What turned out: Trunk link between RB3011 (ether10) and CSS326 (port3, SwOS v2.11) became unreliable even if no RX/TX errors being reported
Further actions: Play with Autonegotiation and Flow Control did not improve the link. But several (!) full power cycles of RB3011 and CSS326 changed something. The heck knows what!

Status now: Link somewhat works but link setup is unclear as different modes are reported (yes, I can’t believe that myself):
CSS326 webif: autonego on, 1G, full duplex, flow control on
RB3011 webif: autonego on, 1G, full duplex, flow (RX&TX) control on
RB3011 console: autonego on, 100M, full duplex, flow (RX&TX) control on
Bildschirmfoto_2020-08-25_08-44-24.png
Take it as a warning and wait for an explanation first!
At least make sure you can powercycle your remote devices! (Not reboot but powercycle=plu-out-plug-in)

2

Actual link state in ROS is displayed using command /interface ethernet monitor ether10 once. With print you don’t really get actual interface state, you only get actual config … and speed=100Mbps in that printout is setting withich would have been applied if auto-negotiation was set to no (which it isn’t).

Any reason to limit advertised modes to only 100Mbps and 1Gbps full-duplex?

Make sure flow control settings match on both link partners.

3

Hi Metod,

thank you for coming back with that. With the hint you gave, I see

[admin@Grobi] /interface ethernet> monitor ether10 once
                      name: ether10
                    status: link-ok
          auto-negotiation: done
                      rate: 1Gbps
               full-duplex: yes
           tx-flow-control: yes
           rx-flow-control: yes
               advertising: 10M-half,10M-full,100M-half,100M-full,1000M-half,1000M-full
  link-partner-advertising: 10M-half,10M-full,100M-half,100M-full,1000M-half,1000M-full
[admin@Grobi] /interface ethernet>

That is then in line with the webif and makes perfect sense then. Thank you for that important hint.

So the conclusion boils down to a certain upgrade procedure to be performed for the RB3011

  1. Upgrade packages
    1a) Reboot
    —> be sure to have direct access to one of the devices ethernet ports <—
  2. Upgrade Routerboard (kernel)
    2a) Reboot
  3. Power cycle RB as reboot seems insufficient
  4. Can’t say for sure, but looks like: Power cycle CSS as well

Otherwise your ethernet ports may not find together.
Or something even more weird happens, I just cannot imagine.
Predictable is certainly something else.

BR
Uwe