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Cisco SG300 - Option 42 not working

jimmyping
Level 1
Level 1

Hi,

I am trying to configure option 42 on a Cisco SG300 switch, NTP option for shoretel phones. When I enter the command:

'option 42 ip 192.168.3.1'   (within the DHCP pool) this error occurs:

DHCP server option parameters mismatch. This code 42 must be from another type.

Here is the DHCP config:

ip dhcp pool network Voice
address low 192.168.3.20 high 192.168.3.220 255.255.255.0
lease 2
default-router 192.168.3.253
option 156 hex xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxdescription ShoreTel
exit

Any ideas would be greatly received

Many Thanks

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