Sliding Window For Monitoring Service Flows - Cisco cBR 8 Configuration Manual

Subscriber Traffic Management
• Each enforce-rule specifies the maximum number of kilobytes a user can transmit during a specified
• Subscribers who exceed the maximum bandwidth that is specified by their enforce-rule can be
• Subscribers are automatically switched back to their registered QoS profile at the end of their penalty
• This feature also supports a no-persistence option, so that the enforced QoS profile does not remain in
• Service providers can display a list of all subscribers' current usage statistics. Service providers can also
• The penalty period persists across reboots of the cable modem, so subscribers cannot avoid the enforced
• If a user that is using excessive bandwidth decides to upgrade to a higher level of service, the service
• Service providers can change subscriber service classes for a particular modem using the cable modem
• Different subscriber monitoring parameters can be configured for weekends, including peak and offpeak

Sliding Window for Monitoring Service Flows

When an enforce-rule is activated, the CMTS periodically checks the bandwidth being used by subscribers
to determine whether any subscribers are consuming more bandwidth than that specified by their registered
QoS profiles. The CMTS keeps track of the subscribers using a sliding window that begins at each sample-rate
interval and continues for the monitoring-duration period.
Each sample-rate interval begins a new sliding window period for which the CMTS keeps track of the total
bytes transmitted. At the end of each sliding window period, the CMTS examines the byte counters to determine
if any subscriber is currently overconsuming bandwidth on the network.
window.
automatically switched to a separate enforced QoS profile that limits their network use for a customizable
penalty period. The enforced QoS profile can change the guaranteed bandwidth, priority, or any other
aspect of the traffic that the service provider considers an acceptable response to subscribers who violate
their service agreements.
period. A technician at the service provider's network operations center (NOC) can also switch them
back before the penalty period expires.
Note To manually switch back, delete the cable modem and allow it to register again.
effect when a cable modem reboots. This option is particularly useful when the feature is initially
implemented, so that the service providers can identify problem subscribers and applications, without
creating a major impact on the entire user base. When repeat offenders are found, they can then be
switched to an enforce-rule that does keep the enforced QoS profile in effect even when the cable modem
reboots.
display a list of just those subscribers who are overconsuming bandwidth.
QoS profile by resetting their modems and reregistering on the cable network. This allows service
providers to set an appropriate penalty for those users that consistently exceed the maximum bandwidth
they have been allocated. Service providers also can specify a time of day when CMs that are identified
for penalty can be released from the penalty period.
provider can reconfigure the provisioning system to assign a new QoS profile to the cable modem. The
user can then reboot the cable modem and come online using the new level of service.
service-class-name command.
monitoring windows. You can also establish the same monitoring windows for every day of the week,
or turn off monitoring altogether on the weekends as desired.
Cisco cBR Series Converged Broadband Routers Quality of Services Configuration Guide for Cisco IOS XE Fuji
Sliding Window for Monitoring Service Flows
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