11-24-2015 02:56 PM 03-08-2019 02:49 AM 更新
Hi all,
I've begun studying the TCP/IP protocol more in depth recently and found that I'm still lacking a bit in understanding of some aspects of MTU.
For example, if I have a Jumbo MTU set to 9000, will it accept all sizes below 9000 without fragmentation? 9000 is simply the point where it says "I now must fragment"?
Another question related to this -- fragmentation increases CPU usage normally, so does increasing the MTU size to 9000 reduce CPU load in environments where larger than normal MTU is used?
I've also read that in some cases we would want to -reduce- the MTU size to accomodate for some protocols, ie. GRE/IPSec tunneling. Why is that necessary?
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11-24-2015 03:07 PM
suggest to go through these docs:
http://www.cisco.com/c/en/us/support/docs/switches/catalyst-4000-series-switches/29805-175.html
http://www.cisco.com/c/en/us/support/docs/ip/generic-routing-encapsulation-gre/25885-pmtud-ipfrag.html
https://supportforums.cisco.com/discussion/11399941/does-jumbo-frames-ever-get-fragmented
http://www.networkworld.com/article/2224722/cisco-subnet/jumbo-frames.html
11-24-2015 03:07 PM
suggest to go through these docs:
http://www.cisco.com/c/en/us/support/docs/switches/catalyst-4000-series-switches/29805-175.html
http://www.cisco.com/c/en/us/support/docs/ip/generic-routing-encapsulation-gre/25885-pmtud-ipfrag.html
https://supportforums.cisco.com/discussion/11399941/does-jumbo-frames-ever-get-fragmented
http://www.networkworld.com/article/2224722/cisco-subnet/jumbo-frames.html
11-24-2015 03:41 PM
Thank you, that pretty much answered all my questions.
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