Change MTU size for APA

[ManojK_1]

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)?

[Wim Rombauts]

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 · Accepted solution]

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]

Is it posible to do while the interface is active.

Manoj

[Sagar Sirdesai]

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

Sagar

[ManojK_1]

Hi Sirdesai,

Thanks.
The steps which you provided works fine.

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

Manoj K

[Sagar Sirdesai]

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

Sagar

[UNIX_HP]

thanks to all !!!