DHCP Option Instance error -% Option 43, instance 1 is illegal. Zero is the only valid instance.

[p oh]

I want to create several DHCP option instances.

if "zero is the only valid instance" why is it that CLI context help showing possible values between 0-255?  Am I missing something here?

cisco ISR4451-X/K9 (2RU)

System image file is "bootflash:/isr4400-universalk9.03.13.04.S.154-3.S4-ext.SPA.bin"

Router#config t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#ip dhcp pool VLAN_AP
Router(dhcp-config)#network 10.8.15.0 255.255.255.0
Router(dhcp-config)# default-router 10.8.15.1
Router(dhcp-config)# domain-name kop.us
Router(dhcp-config)#
Router(dhcp-config)#option 43 ?
ascii Data is an NVT ASCII string
hex Data is a hexadecimal string
instance Specify the option instance
ip Data is one or more IP addresses

Router(dhcp-config)#option 43 ins
Router(dhcp-config)#option 43 instance ?
<0-255> DHCP option instance

Router(dhcp-config)#option 43 instance 1 ?
ascii Data is an NVT ASCII string
hex Data is a hexadecimal string
ip Data is one or more IP addresses

Router(dhcp-config)#option 43 instance 1 hex f104.0a00.2a10
% Option 43, instance 1 is illegal. Zero is the only valid instance.
Router(dhcp-config)#option 43 instance 0 hex f104.0a00.2a10
Router(dhcp-config)# option 43 instance 1 ascii 5A1D;B2;K4;I2.2.2.2;J80
% Option 43, instance 1 is illegal. Zero is the only valid instance.
Router(dhcp-config)#
Router#
000044: *Mar 16 15:16:22.939 HST: %SYS-5-CONFIG_I: Configured from console by console
Router#

[Leo Laohoo]

Just go straight to "option 43 hex <HEX>".

[p oh]

Sorry if I was unclear.  I want to create several DHCP option instances.

for example,

ip dhcp pool VLAN_AP
network 10.8.15.0 255.255.255.0
default-router 10.8.15.1
domain-name kop.us

option 43 instance 3 ip 10.5.0.1
option 43 instance 4 hex f104.0a00.2a10

[Leo Laohoo]

option 43 instance 3 ip 10.5.0.1

DHCP Option 43 is always expressed in HEX.  So the syntax like this will most likely fail.  

[p oh]

Not really, it can be hex, ascii, or IP

ascii Data is an NVT ASCII string
hex Data is a hexadecimal string
ip Data is one or more IP addresses