Hello all,
According to the frequency ask questions in the last year, we have developed some topics on Ethernet basics, please visit Huawei support website to get it. And you can also leave a message on what other topics you want to know. Thanks : )
MTU, MFL and Jumbo Frames:  http://support.huawei.com/carrier/docview?nid=DOC1000078153&path=PBI1-7275726/PBI1-7275738/PBI1-7275792/PBI1-21427014/PBI1-16243

===Link archives (updated 2015-05-26)===

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Amazing Microwaves	Demystifying MSTP	WDM Optical Transport
Huawei RTN: Birth and Evolution	Prelude●Overview and History	Speaking of 100G
How to Maximize BW of Air Interface (1)	MTU, MFL and Jumbo Frames
How to Maximize BW of Air Interface (2)	Key Technologies of EoS: GFP, VCAT and LCAS
How to Maximize BW of Air Interface (3)	PCM Ports, Boards, Services, and Application Scenarios

What is the effect of MTU mismatch in long chain of transmission link.

Dear Bashir Ahmed Zeeshan,
As you could see with the below hyperlinks of your Hedex cd of OSN 3500
http://support.huawei.com/hdx/hdx.do?docid=DOC1000094251&id=r_eline_mstp&text=E-Line%2520Service%2520Parameters%2520%2528Configuration%2520on%2520a%2520Per-NE%2520Basis%2529&lang=en

The MTU(bytes) parameter indicates the maximum transmitted packet length, which is the length of the packet payload.

Impact on the System:
If the length of the packet payload exceeds the value set by the MTU, the packets are discarded during the forwarding.

so, I think if the MTU mismatch, then it will be dropped.

What are the usage of Jumbo frames?

Its about the basics of jumbo frames.
To see more about it, you could see our cd document.
I recommend you below:
http://support.huawei.com/hdx/hdx.do?docid=DOC1000094251&id=tc_osn_cfg_fun_0018&text=Networking%2520and%2520Application&lang=en

dear tanjil, if you have anymore questions, you could tell me.

very clear, thanks.

Good, next edition is where........

Very clear, this solved my confusion during the MTU, MFL and JF.

Well, It seems that the L2 packet is more complex than the L3 packet(1500) that the L2 packet contains the MFL(1518) and the Jumbo Frames(1518 to 64000).
Thank you for sharing.

but a customer is sending Jumbo frame and other customers are sending 1518 byte/1522 byte. but how can i see the frame is coming from which node b/customers ? Also is there any configuration level change required ?

I would be happy if anybody plz suggest.

Thanks