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QoS Profile Enforcement for the Cisco uBR7200 Series Router
Enforcing a Qos Profile Assignment
Verifying QoS Profile Assignments
QoS Profile Enforcement for the Cisco uBR7200 Series Router
Feature Overview
This feature allows cable modem termination system (CMTS) operators to override the provisioned service class of a cable modem at the time of registration with a CMTS local-static qualify of service (QoS) profile.
Benefits
This feature allows CMTS operators to control the QoS from the CMTS and eliminates any interference from improper local-rate limiting implemented on the cable modem. The CMTS provisions a registering cable modem with a default Data Over Cable System Interface Specification (DOCSIS) 1.0 service class that is assigned by the operator. This service class has no upstream or downstream rate limits.
When the modem sends data upstream, it makes bandwidth requests without throttling or dropping packets because of its own rate-policing algorithm. The CMTS does traffic shaping based on the QoS profile enforced by the operator.
Supported Platform
Cisco uBR7200
Supported MIBs and RFCs
None
Configuration Tasks
Perform the following tasks to configure Qos Profile enforcement:
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Enforcing a Qos Profile Assignment
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Enforcing a Qos Profile Assignment
Assigns the QoS profile specified by the index number to all cable modems attempting to connect to the cable router.
Verifying QoS Profile Assignments
Step 1
Notice that the modems are getting their provisioned class of service as indicated by the show cable modem and show cable qos profile commands.
Step 2
Step 3
Step 4
Notice that the cable modems temporarily are assigned the CMTS-defined PRE_REGISTRATION QoS profile with index 2 until the cable modems register with CMTS.
Step 5
Notice that at the end of registration, the modem gets the user-enforced QoS profile as indicated by the show cable modem and show cable qos profile commands.
Configuration Examples
The following example shows how a cable modem with a QoS profile 4 created by the cable modem (cm) is reset to use QoS profile 225 enforced by the cable router (management):
Router#show cable modemInterface SID Online Timing Receive QoS IP address MACaddressState Offset PowerCable6/0/U0 1 online 2848 0.00 4 19.2.20.139 0010.7b6b.7215Router#show cable qos profile 4Service Prio Max Guarantee Max Max tx TOS TOS Create Bclass upstream upstream downstream burst mask value by privbandwidth bandwidth bandwidth enab4 7 128000 64000 2048000 255 0x0 0x0 cm noRouter(config)#cable qos profile 225 max-upstream 256Router(config)#cable qos permission enforce 225Router#clear cable modem all resetRouter#show cable modemInterface SID Online Timing Receive QoS IP address MACaddressState Offset PowerCable6/0/U0 1 offline 2848 0.25 2 19.2.20.139 0010.7b6b.7215Router#debug cable reg....00:15:59: Finished parsing REG Request00:15:59: Overriding Provisioned QoS Parameters In REG-REQ....Router#show cable modemInterface SID Online Timing Receive QoS IP address MACaddressState Offset PowerCable6/0/U0 1 online 2852 0.00 225 19.2.20.139 0010.7b6b.7215Router#show cable qos profile 225Service Prio Max Guarantee Max Max tx TOS TOS Create Bclass upstream upstream downstream burst mask value by privbandwidth bandwidth bandwidth enab225 0 256000 0 0 0 0x0 0x0 management noCommand Reference
This section documents new commands. All other commands used with this feature are documented in the Cisco IOS Release 12.0 command references.
cable qos permission enforce
To override the provisioned QoS profile of the cable modem and enforce a specific CMTS-local QoS profile, use the cable qos permission enforce global configuration command. Use the no form of this command to allow cable modems to use the QoS profile they were configured to use.
cable qos permission enforce index
no cable qos permission enforceSyntax Description
index
Specifies the number of the QoS profile to be enforced on all cable modems connecting to the CMTS. Valid values are from 1 to 255.
Defaults
No default behavior or values.
Command Modes
Global configuration
Command History
Usage Guidelines
This command allows CMTS operators to enforce a profile on all connected cable modems to ensure that rate-limiting is properly implemented.
If the QoS profile to be enforced does not exist at the CMTS during registration, the CMTS uses the QoS profile configured for the registering cable modem.
Example
The following example shows how a cable modem with a QoS profile 4 created by the cable modem (cm) is reset to use QoS profile 225 enforced by the cable router (management):
Router#show cable modemInterface SID Online Timing Receive QoS IP address MACaddressState Offset PowerCable6/0/U0 1 online 2848 0.00 4 19.2.20.139 0010.7b6b.7215Router#show cable qos profile 4Service Prio Max Guarantee Max Max tx TOS TOS Create Bclass upstream upstream downstream burst mask value by privbandwidth bandwidth bandwidth enab4 7 128000 64000 2048000 255 0x0 0x0 cm noRouter(config)#cable qos profile 225 max-upstream 256Router(config)#cable qos permission enforce 225Router#clear cable modem all resetRouter#show cable modemInterface SID Online Timing Receive QoS IP address MACaddressState Offset PowerCable6/0/U0 1 offline 2848 0.25 2 19.2.20.139 0010.7b6b.7215Router#debug cable reg....00:15:59: Finished parsing REG Request00:15:59: Overriding Provisioned QoS Parameters In REG-REQ....Router#show cable modemInterface SID Online Timing Receive QoS IP address MACaddressState Offset PowerCable6/0/U0 1 online 2852 0.00 225 19.2.20.139 0010.7b6b.7215Router#show cable qos profile 225Service Prio Max Guarantee Max Max tx TOS TOS Create Bclass upstream upstream downstream burst mask value by privbandwidth bandwidth bandwidth enab225 0 256000 0 0 0 0x0 0x0 management noRelated Commands