9k Jumbo frames in lan with a few 100mbit devices?

Posted on 2005-05-11
Last Modified: 2008-01-09
I upgraded a small client's network to gigabit with a NETGEAR GS716T SMART SWITCH (supports 9k jumboframes).  Everything is plugged into this switch.

All adapters are intel 1000mt (support 9k jumboframes).  There is a 5-port 100mbit Dlink dsl router (gateway to internet) and a couple 10mbit jetdirect printserver devices on this network.

Will things work if I set the 1000mbit cards to 9k jumbo frames?  

Would plugging the 10mbit devices into the dsl router change anything relevant?
Question by:jwf1776
    LVL 27

    Accepted Solution

    >>Will things work if I set the 1000mbit cards to 9k jumbo frames?  

    They should.

    >>Would plugging the 10mbit devices into the dsl router change anything relevant?

    They shouldn't.  However, if your clients are sending jumboframes to the dlink router, the dlink router may drop the frames thinking they're giants.  Best case is that the dlink is going to have to fragment those frames way down, which will slow it down a lot.  

    I don't think using jumbo frames are really going to give you much.  Is there some special application need for them?

    Author Comment

    no there isn't a special application... I was just trying to get the best performance for this environment

    LVL 27

    Expert Comment

    If you're doing massive file transfer (like a Network backup over the LAN) then Jumbo Frames may make a difference.  For normal everyday mundane apps, they won't - and you won't touch the capacity of GigE either.

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