Relaying DHCP Packets That Originate from a Cable Modem

You can use the DHCP vendor class identifier option (option 60) to configure DHCP relay to relay DHCP packets that originate from a cable modem to an external DHCP server that provides the cable modem with the configuration it requests.

Configure the vendor class identifier option to match the string used by cable modems—DHCP relay then forwards the packets to each DHCP server that you configured with the set dhcp vendor-option command (these servers are also considered to be cable-modem DHCP servers).

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