At work we found a set APC AP7920 switch ... / 2011-12-14

2011-12-14 At work we found a set APC AP7920 switch ...
At work we found a set APC AP7920 switched rack PDUs. A power distribution unit with a console / telnet / ssh / web interface. But they didn't accept the DHCP offers at work, I found out from the documentation they need a vendor specific dhcp option set. Which I can disable in the configuration, after I get access via the network (the serial access requires a special cable).

DHCP in homeserver greenblatt to the rescue. Added to the configuration of ISC DHCP server:
option apc-vendor-cookie code 43 = string;
option apc-vendor-cookie 01:04:31:41:50:43;
and the unit accepts the DHCP offer and I can switch that option off in the configuration. They are nice units, especially for far away server rooms. Including the option to delay power-on of each outlet to avoid high power surges and dependency problems.

Update 2012-01-01: Later I noticed a PC booting via PXE using the heavy duty boot environment was confused by the apc option being set for all devices. Better solution for the above:
option apc-vendor-cookie code 43 = string;

if substring (option vendor-class-identifier, 0, 3) = "APC" {
	option apc-vendor-cookie 01:04:31:41:50:43;

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