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Chapter 2 Cisco CMTS Configuration Commands
ip dhcp relay information option
ip dhcp relay information option
To configure the Cisco CMTS so that it inserts the MAC address of a CM into the DHCP packet received
from a CM or host before it forwards the packet to a DHCP server, use the
ip dhcp relay information
option
in global configuration mode. To disable the MAC address insertion, use the
no
form of this
command.
ip dhcp relay information option
no ip dhcp relay information option
Syntax Description
This command has no keywords or arguments.
Defaults
no ip dhcp relay info option
Command Modes
Global configuration
Command History
Usage Guidelines
This functionality enables a DHCP server to identify the user (CM) sending the request. When this
option is enabled, the CMTS inserts the DHCP relay agent information option (also called option 82),
which contains the CM or host MAC address, in forwarded BOOTREQUEST messages.
Examples
The following example shows how to enable the insertion of DHCP relay agent information into DHCP
packets:
Router#
configure terminal
Router(config)#
ip dhcp relay information option
Related Commands
Release
Modification
12.0(1)T
This command was introduced for non-CMTS platforms.
12.0(7)XR2, 12.1(T),
12.1(2)EC1,
12.0(10)SC
This command was supported for the Cisco uBR7200 series routers,
replacing the
cable relay-agent-option
command, which was used in
previous Cisco IOS releases for this purpose.
Command
Description
cable dhcp-giaddr
Modifies the GIADDR field of DHCPDISCOVER and
DHCPREQUEST packets with a Relay IP address before they are
forwarded to the DHCP server.
cable helper-address
Specifies a destination IP address for User Datagram Protocol (UDP)
broadcast (DHCP) packets.
Содержание Broadband Cable
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