Cisco 7246VXR - uBR Router Software Configuration Manual page 82

Supported Software Features for the Cisco uBR7200 Series
To display the Type/Length/Value (TLV) encodings parsed by the DOCSIS 1.1 TLV parser/encoder, use
the debug cable tlvs command in privileged EXEC mode. The no form of this command disables
debugging output.
Refer to the following documents on Cisco.com for additional information about the TLV parser/encoder:
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UpstreamAddress Verification
This feature prevents the spoofing of IP addresses. Using the CLI, administrators can determine the IP
and MAC address of a given cable interface, and the SID number that shows the IP and MAC addresses
of all devices learned in the cable interface's MAC table.
The CMTS verifies the source IP address against the MAC address for the cable modem. Cable modem
and PC IP addresses are verified to ensure that SID and MAC addresses are consistent. A PC behind a
cable interface is assigned an IP address from the DHCP server. If a user on a second PC or cable
interface statically assigns the same IP address to a PC, the Cisco uBR7200 series CMTS reports this.
Using customer databases, administrators can cross-reference the spoofing cable modem and PC to
prevent further usage.
The cable source-verify [dhcp] command (for cable interfaces) specifies that DHCP lease query requests are
sent to verify any unknown source IP address found in upstream data packets. Upstream Address Verification
requires a DHCP server that supports the new LEASEQUERY message type.
supports the LEASEQUERY message type in Cisco IOS Release 3.01(T) and later releases.
For configuration information, refer to the
section on page
Upstream QoS Improvements
Supported QoS models for the upstream are:
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For detailed information about QoS, refer to the DOCSIS 1.1 for the Cisco uBR7200 Series Universal
Broadband Routers feature module on Cisco.com:
Upstream QoS Models Supported
Supported QoS models for the upstream are as follows:
Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
1-64
debug cable tlvs
no debug cable tlvs
Cisco IOS CMTS Cable Command Reference Guide
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_book.html
DOCSIS 1.1 for the Cisco uBR7200 Series Universal Broadband Routers
http://www.cisco.com/en/US/docs/cable/cmts/feature/DOCSIS11.html
Cable DOCSIS 1.1 FAQs
http://www.cisco.com/warp/public/109/cable_faq_docsis11.shtml
5-4.
Best-effort—Data traffic sent on a non-guaranteed best-effort basis.
Committed information rate (CIR)—Guaranteed minimum bandwidth for data traffic.
Unsolicited grants (UGS)—Constant bit rate (CBR) traffic, such as voice, that is characterized by
fixed size packets at fixed intervals.
Unsolicited grants with activity detection (USG-AD)—Combination of UGS and RTPS, to
accommodate real time traffic that might have periods of inactivity (such as voice using silence
suppression). The service flow uses UGS fixed grants while active, but switches to RTPS polling
during periods of inactivity to avoid wasting unused bandwidth.
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/cmtsfg.html
Chapter 1 Overview of Cisco uBR7200 Series Software
"Activating Cable Modem Upstream Address Verification"
Cisco Network Registrar
OL-2239-05