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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)
• 2R3C policer provides exceed and violate counters as a single counter.
Propagation Limitations
The Cisco ASR 901 has the following limitations when propagating QoS values between interfaces:
• The following limitations apply when traffic ingresses through a GigabitEthernet interface and
egresses through a GigabitEthernet interface:
–
When traffic is switched at layer 2, the QoS group is propagated through the router.
• The following limitations apply when traffic ingresses through any other interface type
(host-generated, PPP) and egresses through the GigabitEthernet interface.
–
The Precedence bit value is propagated to the CoS bit (for host-generated interface only).
–
The CoS bit value is mapped 1:1 to the QoS group value.
See Sample QoS Configuration, page 24-33 for a sample QoS configuration that accounts for
propagation limitations on the Cisco ASR 901.
Classification Limitations
Table 24-2 summarizes the values that you can use to classify traffic based on interface type. The values
are parameters that you can use with the match command.
Table 24-2 QoS Classification Limitations by Interface
GigabitEthernet PPP
Value Ingress Egress Ingress Egress
access-group
all X X
any X X X X
class-map
cos X X
destination-address
discard-class
dscp XXXX
flow pdp
frde
frdlci
ip dscp XXXX
ip precedence X X
ip rtp
mpls experimental X
not
packet length
precedence X X