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Enabling Jumbo Frames On Our LAN

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Last Modified: 2013-11-09
Hi there,

I'm not really a networking guy so would like some advice on this please. We have a network of various mixed Dell workstations and servers, connected by Dell Powerconnect 53xx switches. All Windows XP/2003.

I was thinking about enabling Jumbo frames to try and squeeze some speed out of the network for an application we use which uses SMB heavily to access data on a file share.

My questions are:

1. Would increasing the frames size to 9000 bytes give much of a performance boost to clients? What factors would affect this?
2. Inevitably some workstations will have NICs which do not support increased frame sizes. If I increase the frame size on the file server's switch port, will this kill comms to clients that do not support larger frames, or those clients who's switch port I haven't increased the frames size? Or, is there a negotiation which happens between the client/switch/server which brings the size back down in these cases?
3. Is there anything I should be wary about before doing this?

Hope that makes sense. Any help/comments would be greatly appreciated...
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gcz

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