Cisco SR2016T-NA Reference Manual page 53

Reference guide

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Cisco CMTS Configuration Commands

cable dhcp-giaddr

To modify the GIADDR field of DHCPDISCOVER and DHCPREQUEST packets with a Relay IP address

before they are forwarded to the DHCP server, use the cable dhcp-giaddr command in cable interface or

subinterface configuration mode. To set the GIADDR field to its default, use the no form of this

Syntax Description

No default behaviors or values

Command Modes

Interface configuration and subinterface configuration (cable interface only)

Command History

cable dhcp-giaddr {policy [strict] | primary}

no cable dhcp-giaddr

Modification

This command was introduced.

This command was supported.

The subinterface support was added.

Support for the strict option was added.

Selects the control policy, so the primary address is used for CMs and

the secondary addresses are used for hosts and other customer

premises equipment (CPE) devices. This setting is typically used

when the CMs on the interface are configured for routing mode, so

that the CMs and hosts can use IP addresses on different subnets.

(Optional, only when the policy keyword is specified) Uses the

GIADDR IP address as the source IP address in the forwarded DHCP

OFFER packet.

By default when using the policy option, the Cisco CMTS changes

the source IP address in the DHCPOFFER packet to match that of the

primary address on the cable interface. Use the strict option to

prevent this behavior, which could interfere with any access lists

applied to the CM when the CM is using a different subnet from the

cable interface's primary address space.

Always selects the primary address to be used for the GIADDR field

for both CMs and CPE devices. This option is typically used for the

Cisco uBR-MC16E card and Cisco uBR7100E series routers to

support EuroDOCSIS operations.

Cisco Broadband Cable Command Reference Guide

cable dhcp-giaddr

Broadband cable