02-27-2018 07:42 AM - edited 03-01-2019 06:18 AM
Hello everyone,
We would like to set up jumbo frames between a cisco 2960 and a cisco 3850.
On the 2960 :
2960#show system mtu
System MTU size is 1500 bytes
System Jumbo MTU size is 9198 bytes
System Alternate MTU size is 1500 bytes
Routing MTU size is 1500 bytes
On the 3850 :
3850#show system mtu
Global Ethernet MTU is 9198 bytes.
A ping from the server plugged in to the 3850 switch to the ISCSI card of the storage server is not working.
Apparently it works up to 8972 but no more.
Could you help me ? Do I miss something in the config ?
Thank you very much.
Solved! Go to Solution.
02-28-2018 09:46 AM
02-27-2018 10:21 AM
02-27-2018 03:50 PM
02-28-2018 04:33 AM
Hi Rick,
Thanks a lot for your answer. I think it's the way we tested it that was wrong. We tested from the server by pinging this way :
ping x.x.x.x -l 9000
ping x.x.x.x -f -l 9000 was giving :
Packet needs to be fragmented but DF set
ping x.x.x.x -l 8972 is working.
From what i've read here :
The good way to test jumbo frames from Windows is with -l 8972. Is that right ?
Thank you!
02-28-2018 09:46 AM
03-05-2018 06:25 AM
Thanks a lot Rick!
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