cancel
Showing results for 
Search instead for 
Did you mean: 

Change MTU size for APA

SOLVED
Go to solution
ManojK_1
Valued Contributor

Change MTU size for APA

Hi,

I have done APA on HP Unix 11.31.

Now i want to change the MTU size for lan901.

How can i achieve that?

Page 88 of the document
http://docs.hp.com/en/J4240-90049/APA-Admin-Guide.pdf
is showing test it is not possible to reset speed, duplex mode AND MTU over a link aggregate.

How i can achieve my requirement (New MTU Size)?

Thanks and Regards,
Manoj K
7 REPLIES
Wim Rombauts
Honored Contributor

Re: Change MTU size for APA

You need to set the MTU size on all underlying physical lan devices, then stop lan901 (or unconfigure), reinitialize the physical lan devices and start (or configure) APA for lan 901. This procedure will disrupt your network traffic.

I delayed this configuration in the past until I had to install a set of patches, since a reboot of the server does all the above.
Sagar Sirdesai
Trusted Contributor
Solution

Re: Change MTU size for APA

Hi Manoj,
You can change the MTU size of the underlying interfaces( for example lan901=lan50 and lan52)
Below are the list of steps to change to mtu size to 1476 0n lan50.

nwmgr -s -f -c lan50 -A mtu=1476 --cu
lan50 current values:
New MTU = 1476

lanadmin -m 50
MTU Size = 1476


Now to make the changes available across reboot use the below command


nwmgr -s -A all --sa --fr cu -c lan50.
lan50 saved values:
New Speed = auto_on
New MTU = 1476
New MAC Address = 0x001e0bfdb0a6
New Receive Flow Control = On
New Transmit Checksum Offload = Off
New Receive Checksum Offload = Off
New Virtual MTU = 0
TCP Segmentation Offload is now disabled.
New Max Send Buffers = 1
New Max Send Coalesce Ticks = 150
New Max Recv Buffers = 1
New Max Recv Coalesce Ticks = 0
New Interrupt Throttle Mode = -1
New Diagnostics Threshold = 0

nwmgr -s -c lan52 -A mtu=1476 --cu
lan52 current values:
New MTU = 1476
nwmgr -s -c lan52 -A all --saved --from cu
lan52 saved values:
New Speed = auto_on
New MTU = 1476
New MAC Address = 0x001e0bfdc060
New Receive Flow Control = On
New Transmit Checksum Offload = Off
New Receive Checksum Offload = Off
New Virtual MTU = 0
TCP Segmentation Offload is now disabled.
New Max Send Buffers = 1
New Max Send Coalesce Ticks = 150
New Max Recv Buffers = 1
New Max Recv Coalesce Ticks = 0
New Interrupt Throttle Mode = -1
New Diagnostics Threshold = 0
ManojK_1
Valued Contributor

Re: Change MTU size for APA

Is it posible to do while the interface is active.

Manoj
Thanks and Regards,
Manoj K
Sagar Sirdesai
Trusted Contributor

Re: Change MTU size for APA

Hi
No you've to shut down the interfaces.
Login through the console and do the changes.

Sagar
ManojK_1
Valued Contributor

Re: Change MTU size for APA

Hi Sirdesai,

Thanks.
The steps which you provided works fine.

Any idea about the settings to be changed in switch side.

Manoj K
Thanks and Regards,
Manoj K
Sagar Sirdesai
Trusted Contributor

Re: Change MTU size for APA

Hi
I've no idea about what needs to be changed on the swicth side

Sagar
UNIX_HP
Advisor

Re: Change MTU size for APA

thanks to all !!!