Tuesday, February 9, 2021

100 Gig BiDi Constant link flap.

Hey Guys : ).

We are currently in the process of creating 100gbit connections between our datacenters, which is less than 2km in between.

When i was configuring this, i also saw that the link flapped a lot with only a 3m fiber cable, and i was able to make the link flap by just moving the fiber cable around. The cable is a complete standard splitted Singlemode OM3 cable (Sorry i don't know much about cables, so i'm not 100% certain).

We have now moved the switches and installed them in racks on both our sites and tested the connection, the link does get up and negotiates a 100gig but ofc. flaps a lot. Like several times each hour.

The SFP modules is Flexoptix 100G QSFP28 BIDI CWDM4 WITH DUAL CDR (They are programmed for compatibility with HPE products). These were the only ones we could find who could do 100gbit BiDi on a 2KM distance for HP(E) equipment.
The switches are HPE FF 5945 48SFP28 8QSFP28.
I know pretty much nothing about hardware and i'm usually just pulled in when there's already data on the wire.

So my question is.. Do i need a high quality fiber cable running from the Fiber patch panel or do any of you have another theory maybe ?

Thanks guys ^^.



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