speed challenge.

[Manish Manwal]

Hi all,

I am facing slow data transfer in my LAN. In the LAN I have one Cisco 3850 L3 switch connected to Cisco 2960 L2 switch in another block through fiber link. When we transfer file from Server to PC I am getting about 1 MB/sec to 2 MB/sec and if we transfer file from PC to server then speed is 90 to 100 Mbps.

[Dennis Mink]

can you do the file upload/download, as close to the server as you can an make the components in the path shorter.

because this is not necessarily a network problem. can you pump the file from one server to the other on the same host?

[Manish Manwal]

when i am transfer file between servers that are connected int same switch then speed is more then 500 Mbps. the problem in up-link fiber. connected to our core switch.
is that any problem if we have fiber backbone is single mode but Patch cable is multi mode

[Leo Laohoo]

What is the transfer speed from a PC to PC (same switch) vs server to server (same switch)?

Wait ... server?  Connected to a 3850?  

[Manish Manwal]

servers connected to switch 2960, then switch 2960 connected to 3850. server to server speed is more the 500 Mbps.

[Dennis Mink]

Send us config of fibre link port and interface stats. See if its clocking up errors. Cheers

[Manish Manwal]

please find the attachment for port stats and port config. in both switch

[dbeattie · Accepted solution]

Yes, drops seem to be a problem. You need to align your hardware selection and either use single or multi-mode:

• Multi-mode cable end-to-end and SX optics, or
• Single-mode cable end-to-end and LX/LH optics

The selection is usually based on the availability of installed cable and the distance that you need to go.

Hope this helps,

Dave

[Manish Manwal · Accepted solution]

backbone is single mode. so we need to change fiber patch cable from LIU to switch. multi mode to single mode. right?

[dbeattie]

Hi Manish,

That is correct, but you will also have to change the SFPs to single-mode ones (1000BaseLX). The part code is GLC-LH-SM.

Hope this helps,

Dave

[paul driver]

Hello

You may also consider using mode conditioning cabling, These can be used in certain circumstances between SM/MM fibre patching