Can't modify MTU to 9000

[j773303]

We had server seeting Lan MTU from 1500 --> 9000 success in sevedral month.
Current time we try to setting MTU to 9000 in new superdome, but action failure
by Error code 22.

Does anyone had the experience about configuring MTU to 9000 failed? Arrpreciate
it if someone can advise any suggestion?



Following are the more system outputs and pls see the attched file for more information.




==============================================================


Product Number: A9834A
System Type: SERVER Superdome including built-in Storage
OS Revision: HPUX 11.23 0609
Patch Bundle: 2006/09


# lanadmin -M 9000 0
Old MTU Size = 1500
Unable to change MTU size: errno = 22



# swlist -l fileset |grep -i iether
# IETHER-DRV B.11.23.0609 HP
PCI/PCI-X IEther Driver
IETHER-DRV.IETHER-KRN B.11.23.0609 IEther
Driver Kernel Software Distribution
IETHER-DRV.IETHER-RUN B.11.23.0609 IEther
Driver Runtime Software Distribution
===============================================================

[Duncan Edmonstone · Accepted solution]

Hi,

Looks like your card is negotiated to just 100BaseT.

Looking ath the ethernet support guide:

http://docs.hp.com/en/J5683-90017/ch03s01.html#babeiagg

It seems to state that you must be operating at 1000BaseT speeds to support jumbo frames (>1500).

HTH

Duncan

[j773303]

Thanks for provide the correct solution.
problem fixed.