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Cisco Broadband Cable Command Reference Guide
OL-1581-08
Chapter 2 Cisco CMTS Configuration Commands
cable helper-address
cable helper-address
To specify a destination IP address for User Datagram Protocol (UDP) broadcast Dynamic Host
Configuration Protocol (DHCP) packets, use the
cable helper-address
command in cable interface or
subinterface configuration mode. To disable this feature, use the
no
form of this command.
cable helper-address
IP-address
[
cable-modem
|
host
]
no cable helper-address
IP-address
[
cable-modem
|
host
]
Syntax Description
Note
You must specify both the
cable-modem
or
host
options in separate commands, using separate IP
addresses, if you decide to use them. If you specify only one option, then the other type of device (cable
modem or host) will not be able to connect with a DHCP server. In addition, if you use the
cable-modem
or
host
option with the same IP address that was previously configured with this command, the new
configuration overwrites the old configuration.
Defaults
If no options are specified, both CM and host UDP broadcasts are forwarded.
Command Modes
Interface and subinterface configuration (cable interface only)
Command History
Usage Guidelines
This command enables CMs and their attached CPE devices (hosts) to use separate DHCP servers, so
that CMs and hosts receive their IP addresses from separate address pools. The
cable-modem
keyword
specifies that only UDP DHCP broadcasts from CMs are forwarded to that particular destination IP
address. The
host
keyword specifies that only UDP broadcasts from hosts (CPE devices) are forwarded
to that particular destination IP address.
The
cable helper-address
command is similar to the
ip helper-address
command, but the
cable helper-
address
command has been enhanced for cable interfaces and DOCSIS networks to allow separate
helper addresses for CMs and hosts. Use only the
cable helper-address
command on cable interfaces,
and use the
ip helper-address
command on all non-cable interfaces.
IP-address
The IP address of a DHCP server to which UDP broadcast packets will
be sent.
cable-modem
(Optional) Specifies that only CM UDP broadcasts are forwarded.
host
(Optional) Specifies that only host UDP broadcasts are forwarded.
Release
Modification
12.1 T
This command was introduced.
12.1(3a)EC
The subinterface support was added.
Содержание Broadband Cable
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Страница 1216: ...6 214 Cisco Broadband Cable Command Reference Guide OL 1581 07 Chapter 6 Cable CPE Commands debug usb ...
Страница 1266: ...A 50 Cisco Broadband Cable Command Reference Guide OL 1581 07 Appendix A Using the ROM Monitor unset ...