Need to change the MTU size of interface in 11.31

[Sagar Sirdesai]

Hi

I have used HP Auto Port Software to aggregate to two NIC lan50 and lan52 in aggregated lan900.

Now I wan to change the MTU sixe of lan900 port.
Please suggest the exact steps needed.
The OS is 11.31

[Ivan Krastev]

Change configuration files for interfaces.
It depends of the NIC type: iether, igelan.
See more here - http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=1149918

regards,
ivan

[Johnson Punniyalingam]

You use lanadmin command to change

man lanadmin

# lanadmin -g 900

LAN INTERFACE STATUS DISPLAY
Fri, Jul 30,2004 12:20:23PPA Number = 900
Description = lan900 Hewlett-Packard LinkAggregate Interface
Type (value) = other(1)
MTU Size = 1500
Speed = 0
Station Address = 0x000000000000
Administration Status (value) = up(1)
Operation Status (value) = down(2)
Last Change = 0
Inbound Octets = 0
Inbound Unicast Packets = 0
Inbound Non-Unicast Packets = 0
Inbound Discards = 0

Thanks,
Johnson

[Johnson Punniyalingam]

Hi ,

Below thread , explains

http://forums13.itrc.hp.com/service/forums/questionanswer.do?admit=109447627+1227609555924+28353475&threadId=1062605

[Ganesan R]

Hi,

You can change the MTU size online without any impact by using SAM as well as #lanadmin -M ppa command.

But the changes will last till you reboot the server. To make it permenant you should change it on corresponding interface driver file..

[Laurent Menase · Accepted solution]

you must first take your interface out of the aggregation, then change the mtu of each interface you want to include in the aggregation.

[Sagar Sirdesai]

Hi

I did use lanadmin -M 1476 lan50

But the command failed.


Can you let me know how to bring the interfaces out of the Auto Port Aggregation.
Do I need to stop apa services using
/sbin/init.d/hpa stop
/sbin/init.d/hplm stop

Sagar

[rick jones]

Any particular reason you want to shrink the MTU being used?

If it is an issue with a particular destination, in theory IP PathMTU discovery should "deal" with it unless someone got the bright idea to block all the ICMP traffic... Otherwise, you can setup static routes with path mtu information that will "override" the interface MTU for that destination.