Confusion about how to set up Option 150

[JWHolm81891]

So, I'm the new network guy at our employer and I've walked in on a VoIP project that has been going on for almost 2 years (people keep quitting) and the vendor is getting stressed with us, naturally. I have configured ports for VoIP, but I have never done a full blown rollout for new phones. The vendor asked me to get Option 150 set up on our end and I'll be honest, I had to look that up. Now I understand what Option 150 is, I'm having a terrible time finding straight out documentation or even just a video explaining where I need to configure at. From what I'm thinking, I'm thinking I need to configure it on our tftp-server, but then do I need to configure per VLAN and on every switch in our network too? 

[balaji.bandi]

where is your DHCP Server running ? on Router or Microsoft DHCP Server :

if MS DHCP follow :

https://4sysops.com/archives/defining-dhcp-option-150-for-cisco-ip-phones/

If the DHCP was configured per VLAN, yes you need to configure per vlan IP address for this option 150 so Phone get to TFTP Server.

[Leo Laohoo · Accepted solution]

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@JWHolm81891 wrote:
I'm thinking I need to configure it on our tftp-server, but then do I need to configure per VLAN and on every switch in our network too? 

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No, that is wrong. 

Option 150 is a DHCP option.  DHCP Option 150 instructs the clients "what is the IP address of my TFTP server".  That is it.  

DHCP Option 150, can only be configured in the DHCP server.  

[JWHolm81891]

Good to know. Saves me a lot of headache.