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Jumbo Frames?

S

skypilot

Golden Member
I have a network running on a Dell Powerconnect 5224 GigE switch. A couple hosts are running on GigE NICs which support jumbo frames, but the balance are on simple Intel Pro/100 cards (still good, but not GigE).

I've heard a lot about jumbo frames, but I have them turned off at the switch, and on all the GigE NICs. If I turn them on at the switch and on all the NICs, will that cause problems w/ my 100Mbps connections? Will it make my GigE connections that much better?

Basically, what's the deal w/ Jumbo Frames on a mixed GigE / FastE LAN?
 
we had a discussion similar to this a while back...

if you want to take advantage of jumbo frames (frame larger than 1514) both the sender, reciever, and all devices inbetween need to support it. it you have a mixed environment, youll want to segregate jumbo frame and non-jumbo frame devices into seperate vlans. from your description, its just asking for trouble...
 
OK. I would still want the GigE hosts to be able to talk to the FastE hosts, so I'll just keep jumbo frames turned off until all computers on the network have Intel Pro/1000s sitting happily in their PCI slots 🙂
 
I think that's a L3 switch and in that case couldn't he route between the VLANs? Or am I on a completely wrong track?
 
if thats the case, then yes, but something would still have to fragment those 9000 byte frames down to 1500. the switch may be able to do this as well, but i'd stay away from fragmenting on that large a scale.
 
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