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Posts: 10
Joined: Fri Nov 22, 2013 9:20 am
Location: Lithuania

10G link problem on CRS326-24G-2S+

Mon Oct 15, 2018 11:37 am


I have following setup:
installed two devices CRS326-24G-2S+ in the same rack. Both devices booting into Router OS.
Both devices connected over sfp+ with DAC:
copper pigtail, 1m
Vendor serial: MCS17H10458

I expect to have 10Gb link between both devices.
Port speed detected properly on both devices, it is 10Gbps, sfp+ ports are in the bridge with HW offload on both devices.
Speed over this link is terrible. Also noticed, that ping from console of first device to IP of second devices is able to send only 4-5 packets, the rest packets do not reach destination IP.
Link state is OK, but packets are lost. I read lot of forum articles, I try various sfp+ port settings, disabled/enabled auto-negotiation, set speed manually - nothing helped.
There is no firewall or other "special" settings for sfp+ ports on both devices. Router OS is latest version: 6.43.2
Could you please advice: what is wrong with 10G link via DAC on mentioned devices?
Posts: 29
Joined: Mon Feb 20, 2017 6:11 pm

Re: 10G link problem on CRS326-24G-2S+

Mon Nov 26, 2018 9:58 am

probably not only DAC, these switches' 10G -> 1G traffic is problematic.

very old issue, over 1 and a half years.

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