CBS350-24T-4X switches will not link with MikroTik XS+2733LC15D SFP+ modules

Question

The poster (in a machine-translated post from the Spanish-language community) tried to connect two Cisco Business CBS350-24T-4X switches through their SFP+ ports using MikroTik XS+2733LC15D modules. No connectivity is established and the ports end up blocked by the switch's Link Flap Prevention feature. The same MikroTik modules work without problems in a Ubiquiti switch. Disabling 802.3 Energy Efficient Ethernet, Link Flap Prevention and Smartport did not help. The switches run firmware 3.4.0.17.

Hardware: Cisco Business CBS350-24T-4X, Ubiquiti switch (unspecified)
Transceivers: MikroTik XS+2733LC15D
Form factor: SFP+

Symptoms / messages:

no link between the two switches
ports blocked by Link Flap Prevention
link flapping
same modules work in a Ubiquiti switch

laserops32 · Answer

It sounds like an optic compatibility problem; Cisco generally does not support third-party optics.

corebyte73 · Answer

Use Cisco SFP+ modules or a trusted third-party brnd scuh as Finisar instead.

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