turn auto neg off, try flow control on and off. Check your light levels on
all 4 sfp's and make sure they are within spec, if not clean the fibers or
add an attenuator(s)

On Thu, Aug 26, 2021 at 12:20 PM Josh Baird <[email protected]> wrote:

> FWIW - we have a WTM4200 with a CCR2004 on one end and don't have that
> issue.
>
> On Thu, Aug 26, 2021 at 3:13 PM Joe Novak <[email protected]> wrote:
>
>> Test with anything other than a CCR2004. I'd be willing to bet on it
>> being the problem.
>>
>> On Thu, Aug 26, 2021 at 2:05 PM Jason McKemie <
>> [email protected]> wrote:
>>
>>> Are you familiar with the Aviat radios?  I cannot seem to find anywhere
>>> to set flow control on the ethernet interfaces.
>>>
>>> On Thu, Aug 26, 2021 at 1:25 PM Colin Stanners <[email protected]>
>>> wrote:
>>>
>>>> Have you tried Flow Control off/on, on both devices, at one end's
>>>> Ethernet link? What model of MT router?
>>>>
>>>> On Thu, Aug 26, 2021, 1:20 PM Jason McKemie <
>>>> [email protected]> wrote:
>>>>
>>>>> I'm having an issue where about 3-8% of packets going through a
>>>>> WTM4200 link are seeing a 1-10ms spike in latency.  Aviat support is not
>>>>> being particularly helpful, they just say they're seeing CRC errors at
>>>>> one end and to replace the SFPs and cabling to see if that helps.  These
>>>>> have a fiber connection and are powered through the DC port.  The radios /
>>>>> SFPs / fiber at both ends are new.  I've already replaced the SFPs on the
>>>>> attached Mikrotik routers with Aviat SFPs with no change in the issue.
>>>>> Incidentally, I'm seeing the issue when I ping from the Mikrotik routers 
>>>>> to
>>>>> their respectively attached WTM - so the issue is both ends and not a
>>>>> single one.  Has anyone seen anything like this?
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