If you are running spanning tree you may get in trouble with anaconda network initialization. Spanning tree needs about a 30 seconds to bring the switch port up, so you may run in dhcp timeout.
To solve with add following anaconda option to the kernel boot parameters:
dhcptimeout=60Sample:
#Install CentOS 5.4 x86
label install_centos54_x86
menu label ^CentOS 5.4 x86
menu default
kernel repo/CentOS/releases/5.4/i386/isolinux/vmlinuz
ipappend 2
append initrd=repo/CentOS/releases/5.4/i386/isolinux/initrd.img ramdisk_size=8192 ip=dhcp ks=http://kickstartserver/configs/centos_54_x86/ks.cfg ksdevice=bootif noshell unattended=yes dhcptimeout=60See also: