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This feature allows cable modem termination system (CMTS) operators to override the provisioned service class of a cable modem during registration with a CMTS local-static qualify of service (QoS) profile.
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, the modem 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.
Cisco uBR7200
None
Perform the following tasks to enforce a Qos Profile:
| Command | Purpose |
|---|---|
Router(config)#cable qos permission enforce index | Assigns the QoS profile, specified by the index number, to all cable modems attempting to connect to the cable router. |
Step 1 Load the ubr7200 and wait for the modems to come on line as indicated by the show cable modem command.
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 Configure any QoS profile with for example index 1 at the CMTS by using the SNMP/CLI.
Step 3 Enter the global command cable qos permission enforce 1.
Step 4 Enter the clear cable modem all reset global command to force the modems to reregister with the CMTS.
Notice that the cable modems are assigned temporarily the CMTS-defined PRE_REGISTRATION QoS profile with index 2 until the cable modems register with CMTS.
Step 5 Use the debug cable reg command to see that the provisioned QoS parameters of the modems are overwritten at the CMTS during registration.
Notice that at the end of the registration, the modem gets the user-enforced QoS profile as indicated by the show cable modem and show cable qos profile commands.
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 modem
Interface SID Online Timing Receive QoS IP address MAC
address
State Offset Power
Cable6/0/U0 1 online 2848 0.00 4 19.2.20.139 0010.7b6b.7215
Router#show cable qos profile 4
Service Prio Max Guarantee Max Max tx TOS TOS Create B
class upstream upstream downstream burst mask value by priv
bandwidth bandwidth bandwidth enab
4 7 128000 64000 2048000 255 0x0 0x0 cm no
Router(config)#cable qos profile 225 max-upstream 256
Router(config)#cable qos permission enforce 225
Router#clear cable modem all reset
Router#show cable modem
Interface SID Online Timing Receive QoS IP address MACaddress
State Offset Power
Cable6/0/U0 1 offline 2848 0.25 2 19.2.20.139 0010.7b6b.7215
Router#debug cable reg
....
00:15:59: Finished parsing REG Request
00:15:59: Overriding Provisioned QoS Parameters In REG-REQ
....
Router#show cable modem
Interface SID Online Timing Receive QoS IP address MACaddress
State Offset Power
Cable6/0/U0 1 online 2852 0.00 225 19.2.20.139 0010.7b6b.7215
Router#show cable qos profile 225
Service Prio Max Guarantee Max Max tx TOS TOS Create B
class upstream upstream downstream burst mask value by priv
bandwidth bandwidth bandwidth enab
225 0 256000 0 0 0 0x0 0x0 management no
This section documents new commands. All other commands used with this feature are documented in the Cisco IOS Release 12.0 command references.
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
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. |
No default behavior or values.
Global configuration
| Release | Modification |
|---|---|
11.3(9)NA | This command was introduced. |
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.
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 modem
Interface SID Online Timing Receive QoS IP address MAC
address
State Offset Power
Cable6/0/U0 1 online 2848 0.00 4 19.2.20.139 0010.7b6b.7215
Router#show cable qos profile 4
Service Prio Max Guarantee Max Max tx TOS TOS Create B
class upstream upstream downstream burst mask value by priv
bandwidth bandwidth bandwidth enab
4 7 128000 64000 2048000 255 0x0 0x0 cm no
Router(config)#cable qos profile 225 max-upstream 256
Router(config)#cable qos permission enforce 225
Router#clear cable modem all reset
Router#show cable modem
Interface SID Online Timing Receive QoS IP address MACaddress
State Offset Power
Cable6/0/U0 1 offline 2848 0.25 2 19.2.20.139 0010.7b6b.7215
Router#debug cable reg
....
00:15:59: Finished parsing REG Request
00:15:59: Overriding Provisioned QoS Parameters In REG-REQ
....
Router#show cable modem
Interface SID Online Timing Receive QoS IP address MACaddress
State Offset Power
Cable6/0/U0 1 online 2852 0.00 225 19.2.20.139 0010.7b6b.7215
Router#show cable qos profile 225
Service Prio Max Guarantee Max Max tx TOS TOS Create B
class upstream upstream downstream burst mask value by priv
bandwidth bandwidth bandwidth enab
225 0 256000 0 0 0 0x0 0x0 management no
| Command | Description |
cable qos profile | Configures a QoS profile. |
Posted: Mon Jan 10 18:45:48 PST 2000
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