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Community Member

Jumbo Frames over 10/100 link

Hi everyone,

I read that Jumbo frames, when enabled on Gig ingress interfaces on a switch, will be dropped if the egress interface is 10/100. Does this hold true if the actual egress interface on the switch is a gig interface however the port on the other end of that interface is 10/100 only such in a case of a PC. Would the frames still get dropped?

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Jumbo Frames over 10/100 link

"Would the frames still get dropped?"

No. But it will fragment frames and which will cause high CPU utilization and delay.

Hope that answers your question.

thanks

Silver

Jumbo Frames over 10/100 link

Ricky,

Kinda depends on your switch/pc.  There are some switches that have support for jumbo frames at 10/100.  Like some of the line cards of a 6500.  So if your switch supports jumbo on 10/100 and your host supports jumbo frame on 10/100 then no, nothing is dropped.  Assuming the Jumbo value set is not larger than either side can support. 

But if either the switch and/or pc doesn't then it will be dropped.  Fragmentation only occurs over a layer3 boundry as long as the DF flag isn't set.   

HTH

Thanks,

Chad

Community Member

Jumbo Frames over 10/100 link

Hi gents, thanks for your responses. I am going to play around with this setting however since a switch reload is required after turning it on, I will have to wait for a window. I'll update this thread with the results.

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