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IP Phones using DHCP options for TFTP

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When deploying Cisco Phones and Call Manager, it may be desirable for the phones to automatically discover the TFTP server/Call Manager in order to download a configuration. This will happen automatically when phones are in the same broadcast domain as the Call Manager Server. However, if your Call Manager server is in a different network, you may need to specify a TFTP server.

This article explains how to specify a TFTP server using DHCP options.

 

Per Cisco's requirements you may need to enable DHCP Option 150 so that in the DHCP broadcasts, phones can also see a list of all TFTP servers that are connected to the network. The following instructions explain how to configure DHCP options DHCP options for a VLAN on an MX, Z1, or layer-3 MS:

 

  1. Navigate to Security appliance > Configure > DHCP (or, for an L3 MS switch, Switch > Configure > Layer 3 > [interface whose DHCP scope is to be altered] > DHCP settings.
  2. Add a DHCP option from the Option drop down and choose Custom.
  3. Add the Code, in this case 150, choose the Type to be IP, and put the IP address of the TFTP server in the Value as per the example below:

You can also learn more about Meraki's DHCP options here.

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Last modified
10:22, 3 Feb 2015

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ID: 2311

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