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Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
OL-2239-05
Chapter1 Overview of Cisco uBR7200 Series Software
cops tcp window-size
Pre-equalization Control for Cable Modems
Cisco IOS Release 12.3(17a)BC introduces pre-equalization control for cable modems on a per-modem
basis. This feature enhances support for pre-equalization control on an interface basis with the
Organizational Unique Identifier (OUI), which is also supported.
When pre-equalization is enabled on an upstream interface, this feature allows you to disable
pre-equalization adjustment selectively, for a specific cable modem or a group of cable modems. This
feature prevents cable modems from flapping when processing pre-equalization requests sent from the
Cisco CMTS.
Restrictions
This feature observes the following restrictions in Cisco IOS Release 12.3(17a)BC:
• For pre-equalization to be supported on a per-modem basis, the cable modem must send verification
of pre-equalization after it registers with the Cisco CMTS.
• The option of excluding the OUI is a global configuration. For the cable modem on which OUI is
excluded, the excluded OUI is disabled for all interfaces. This method uses a list of OUI values,
recording which modems are sent and not sent pre-equalization.
• To remove this exclusion, use the no cable pre-equa exclude {modem|oui} form.
cable pre-equalization exclude
To exclude a cable modem from pre-equalization during registration with the Cisco CMTS, use the
cablepre-equalization exclude command in global configuration mode. Exclusion is supported for a
specified cable modem, or for a specified OUI value for the entire interface. To remove exclusion for
the specified cable modem or interface, use the no form of this command. Removing this configuration
returns the cable modem or interface to normal pre-equalization processes during cable modem
registration.
cable pre-equalization exclude {oui | modem} mac-addr
no cable pre-equalization exclude {oui | modem} mac-addr
Syntax Description
Command Default Pre-equalization is enabled by default on the Cisco router, and for cable modems that have a valid and
operational DOCSIS configuration file. When enabled, pre-equalization sends ranging messages for the
respective cable modems. When disabled with the new exclude command, pre-equalization is excluded
for the respective cable modems.
Command Modes Global configuration mode
oui Organizational Unique identifier for the interface specified. Using this
keyword excludes the specified OUI during cable modem registration for
the associated interface.
modem Cable Modem identifier for the cable modem specified. Using this keyword
excludes the cable modem.
mac-addr Identifier for the OUI or cable modem to be excluded.