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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)
The following limitations also apply when configuring classification on the Cisco ASR 901.
• The following limitations apply to input Gigabit Ethernet interface QoS policies:
–
You can use the match vlan command with a maximum of four VLANs.The match vlan
command is supported only for PORT, EVC, and pseudowire.
–
You can use the match dcsp command with a maximum of four DSCP values.
–
Cisco ASR 901 router first looks for IP DSCP and then the MPLS experimental imposition for
the mpls packets.
• The following limitations apply to output Gigabit Ethernet interface QoS policies:
–
Class maps with queuing action only support matching based on qos-group. This limitation does
not apply to the class-default class map.
–
You cannot create two class maps that match based on the same qos-group value.
• The following limitations apply to input PPP interfaces:
–
You can create up to 8 matches in a class-map using DSCP or MPLS Exp values.
Marking Limitations
Table 24-3 summarizes the values that you can use to mark traffic based on interface type. The values
are parameters that you can use with the set command.
protocol
qos-group X
source-address
vlan X X
Table 24-2 QoS Classification Limitations by Interface
GigabitEthernet PPP
Table 24-3 QoS Marking Limitations by Interface
GigabitEthernet PPP
Value Ingress Egress Ingress Egress
atm-clp
cos X
discard-class X
dscp X
dscp-transmit X
ip dscp X X X
ip precedence X X
mpls experimental
mpls experimental imposition X X
mpls experimental topmost
qos-group
X