ETHLINE line speed 10M set to 100/1GB

We are running v5r4 and system is a 520.

Currently our Iseries is set to 10M for a connection as seen below:

Line speed . . . . . . . . . . . . :   LINESPEED   10M  
Current line speed . . . . .. . :                       10M  
Duplex . . . . . . . . . . .... . . . :   DUPLEX      *HALF

I am interested in instructions on how to change this to 100 or 1GB as im pretty sure our iseries supports it.  The reason I am told it is set to 10 was an old switch which has been replaced was a 10MB switch.

WRKLIND LIND(*ELAN)   - is this the only place that needs to be configured?  this is what shows:

ETHLINE     *ELAN       Ethernet Line Description
RS99BGCAPP  *ELAN                                
RS99BGCBPP  *ELAN                                

We have 2x IXA's and here are their values:

Ethernet standard  . . . . . . . . :   ETHSTD        *ALL
Line speed . . . . . . . . . . . . . . :   LINESPEED   1G  
Current line speed . . . . . . . . :                        1G  
Duplex . . . . . . . . . . . . . . .. . . :   DUPLEX        *FULL

Also do I need/want the duplex set to half or full?  Will i need to restart any subsystems or devices when I make the change or simply vary off / vary back on the device?  Any details would be much appreciated!  Thanks in advance.