Docsis 1.0 Concatenation Override Featurette - Cisco 7246VXR - uBR Router Software Configuration Manual

Supported Software Features for the Cisco uBR7200 Series
BPI supports access control lists (ACLs), tunnels, filtering, protection against spoofing, and commands
to configure source IP filtering on RF subnets to prevent subscribers from using source IP addresses that
are not valid.
Baseline privacy extensions permit the encryption of data transferred between the cable modem and the
Cisco uBR7200 series universal broadband router. The key management protocol defined by baseline
privacy allows Cisco uBR7200 series universal broadband routers to provide two types of keys to cable
modems. The Key Exchange Key (KEK) decrypts the Traffic Exchange Keys (TEK). The TEK is the key
used to encrypt and decrypt data packets.

DOCSIS 1.0 Concatenation Override Featurette

Cisco IOS release 12.3(13a)BC introduces support for the DOCSIS 1.0 concatenation override feature
on the Cisco uBR10012 router. This feature provides the ability to disable concatenation on DOCSIS 1.0
cable modems, even in circumstances where concatenation is otherwise supported for the upstream
channel.
DOCSIS 1.0 concatenation allows the cable modem to make a single-time slice request for multiple
packets, and to send all packets in a single large burst on the upstream. Concatenation was introduced in
the upstream receive driver in the previous Cisco IOS releases that supported DOCSIS 1.0 +. Per-SID
counters were later added in Cisco IOS release 12.1(4)CX for debugging concatenation activity.
In some circumstances, overriding concatenation on DOCSIS 1.0 cable modems may be preferable, and
Cisco IOS release 12.3(13a)BC supports either option.
Even when DOCSIS 1.0 concatenation is disabled with this feature, concatenation remains enabled for
Note
cable modems that are compliant with DOCSIS 1.1 or DOCSIS 2.0.
To enable DOCSIS 1.0 concatenation override with Cisco IOS release 12.3(13a)BC and later releases,
use the new docsis10 keyword with the previously supported cable upstream <n> concatenation
command in privileged EXEC mode:
Syntax Description
n
Examples The following example illustrates DOCSIS 1.0 concatenation override on the Cisco uBR7246VXR
router:
Router# no cable upstream 0 concatenation docsis10
In this example, DOCSIS 1.0 cable modems are updated with REG-RSP so that they are not permitted
to use concatenation.
For additional information about this command, refer to the Cisco IOS CMTS Cable Command Reference
Guide on Cisco.com:
Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
1-50
cable upstream <n> concatenation docsis10
Specifies the upstream port number. Valid values start with 0 for the first
upstream port on the cable interface line card.
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_book.html
Chapter 1 Overview of Cisco uBR7200 Series Software
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