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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter 24 Configuring QoS
Configuring Quality of Service (QoS)
Congestion Management Limitations
The congestion management limitations for the Cisco ASR 901 are described in the following sections:
• Queuing Limitations
• Rate Limiting Limitations
Queuing Limitations
The Cisco ASR 901 uses Class-based fair weighted queuing (CBFQ) for congestion management.
Table 24-4 summarizes the queuing commands that you can apply when using CBFQ according to
interface type.
Rate Limiting Limitations
You can use rate limiting for congestion management on the Cisco ASR 901. Table 24-5 summarizes the
rate limiting parameters that you can use with the police command according to interface type. The table
uses the following terms:
• Rate—A speed of network traffic such as a committed information rate (CIR) or peak information
rate (PIR).
• Actions—A defined action when traffic exceeds a rate, such as conform-action, exceed-action, or
violate-action.
precedence X
prec-transmit X
qos-group X X
Table 24-3 QoS Marking Limitations by Interface
GigabitEthernet PPP
Table 24-4 QoS Queuing Limitations by Interface
GigabitEthernet PPP
Value Ingress Egress Ingress Egress
bandwidth (kbps)
bandwidth percent X X
bandwidth remaining percent X X
compression header ip
drop
fair-queue
priority X X
priority (kbps)
priority (without queue-limit)
priority percent X X
queue-limit (cells)
queue-limit (packets) X
random-detect discard-class-based X