Queue Types; Priority Queues; Cir Queues; Best Effort Queues - Cisco cBR 8 Configuration Manual
Cbr series converged broadband routers
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Queue Types
The DOCSIS WFQ Scheduler also allows significant enhancement to the queue scaling limits.
The following sections explain the DOCSIS WFQ Scheduler features:
Queue Types
The DOCSIS WFQ Scheduler feature supports the following types of queues:
• Priority queues
• CIR queues
• Best Effort queues
Priority Queues
Priority queues are serviced with absolute priority over all the other queues. On DOCSIS downstream interfaces,
the priority queues are configured by DOCSIS applications that request a priority service flow, for example,
a packet cable voice service flow. On WAN uplink interfaces, the priority queues are configured by the MQC
policy maps.
The following restrictions apply to priority queues:
• Only one priority queue is allowed per WAN uplink interface.
• Only one priority queue is allowed for low latency service flows created for each DOCSIS downstream
• All low latency flows on a DOCSIS downstream are aggregated to the single priority queue.
CIR Queues
A CIR queue is guaranteed to be serviced with at least the Committed Information Rate (CIR). CIR queues
are used to service DOCSIS service flows with non-zero minimum reserved rates. If the offered load to a CIR
queue exceeds its CIR value, the excess traffic is serviced as best effort traffic.
Best Effort Queues
The Best Effort (BE) queues share the interface bandwidth not used by the priority queue and the CIR queues.
The sharing is in proportion to each queue's excess ratio.
The following conditions apply to BE queues:
• On DOCSIS downstream interfaces, BE queues are created by DOCSIS service flows that do not request
• Each DOCSIS flow without a minimum reserved rate uses its own BE queue.
Cisco cBR Series Converged Broadband Routers Quality of Services Configuration Guide for Cisco IOS XE
Fuji 16.7.x
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interface.
a minimum reserved rate.
DOCSIS WFQ Scheduler on the Cisco CMTS Routers
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