upgrade 1.3 -> 2.1 question

[Bruno Melli <bruno@hpesbpm.fc.hp.com>]

Hi Folks,

I just upgraded (from CD) my 1.3 system to 2.1. 
After installing 1.3 a couple of years ago I haven't done much
sysadmin so I'm a little rusty when it comes to kernel
configuration...

Everything seems to have updated OK but I'm puzzled that the machine 
was never rebooted during the upgrade. 
What is the mechanism to upgrade the kernel ? (I haven't
kept up to speed with kernel version but I assume 2.1 uses a newer
kernel than 1.3 did...)

Does it mean that I have to upgrade the kernel sources and rebuild one
(as well as making a new boot disk ?)

thanks,

bruno.