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This feature enables a Cisco Universal Broadband Router (uBR) to manipulate the giaddr field in client Dynamic Host Control Protocol (DHCP) requests forwarded to DHCP servers in a Data Over Cable Service Interface Specifications (DOCSIS) environment.
This feature provides hints to the DHCP server as to where (that is, on which IP subnet) the server should allocate addresses to the requesting client.
Cisco uBR7200 Series Cable Router
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This section documents new commands. All other commands used with this feature are documented in the Cisco IOS Release 12.0 command references.
To control giaddr, use the cable dhcp-giaddr Interface Configuration command. Use the no form of this command to set dhcp-giaddr control to the default.
cable dhcp-giaddr [policy | primary]
policy | Selects the control policy, so the primary address is used for cable modems and the secondary addresses are used for hosts. |
primary | Always selects the primary address to be used for giaddr. |
No control of giaddr from the cable code.
Interface Configuration
| Release | Modification |
|---|---|
12.0(4)T | This command was introduced. |
This command allows you to configure the cable modem subnet as the primary address and the host subnet as the secondary address.
The following example sets the primary address to be used always for giaddr.
Router(config-if)#cable dhcp-giaddr primary
Posted: Fri Oct 8 11:25:24 PDT 1999
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