Section 32.4 of the Install Guide, is says that the "network" option supports this argument:
--class= — The DHCP class.
But anaconda throws an error if you use --class. The correct syntax appears to be --dhcpclass.
Many thanks once more Wayne; --dhcpclass it is. Fixed in build 0-85
"--dhcpclass= — The DHCP class. "
*** Bug 625305 has been marked as a duplicate of this bug. ***
Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.