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Does following scenario work? We have single mode fiber running between two building, but we have MMF patchcord connected to SPF (SFP-10GBase-SR). 

[SPF]---MMF----[=======SMF======]----MMF---[SPF]

I am seeing my interface is flapping but just wanted to make sure it whether it because of mixing fiber mode or something else.

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Yes, this absolutely is a problem. Don't ever mix different types of cabling. Multimode has a 50 or 62.5 micron core diameter, while single mode fiber typically has a 9 micron core. If you connect two fibers with different core diameters, you'll lose a lot of the light going through the connector, resulting in a link flapping or being down.

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  • Thanks for quick answer! i had doubt but better confirm with you guys! thanks
    – Satish
    Commented Aug 8, 2016 at 22:45
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Going from a multimode fiber or a lightsource designed for multimode fiber into single mode fiber will result in a very high loss.

You need to replace your patch cords with single mode ones and your transcievers with LR ones.

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No we can not mix single mode and multi mode fiber cables due to difference core diameter in size

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