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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)
Shaping Limitations
Table 24-6 summarizes the values that you can use to mark traffic based on interface type. The values
are parameters that you can use with the shape command.
The following limitations also apply to QoS shaping on the Cisco ASR 901:
• The following limitations apply to input Gigabit Ethernet interfaces:
–
You cannot apply shaping to the class-default class unless you are using hierarchical policy
maps and applying shaping to the parent policy map.
–
If you are using hierarchical policy maps, you can only apply the class-default class to the parent
policy map.
ACL-based QoS Restrictions
In addition to all the limitations applicable to current QoS configuration, the following restrictions are
applicable for ACL-based QoS.
• IPv6 ACLs are not supported
• ACL-based QoS is limited to source and destination IP addresses. Extended ACLs with extended
options like DSCP, fragments, option, precedence, time-range, ToS, and TTL are not supported.
• MAC ACLs are not supported. Only IP ACLs are supported.
• You can configure only named access lists in QoS; other ACL types are not supported.
• Only source and destination IPv4 addresses are supported in the access-list definition.
Table 24-5 QoS Rate Limiting Limitations by Interface
GigabitEthernet PPP
Policing with Ingress Egress Ingress Egress
One rate
One rate and two
actions
X
Two rates and two
actions
Two rates and
three actions
X
Table 24-6 QoS Shaping Limitations by Interface
GigabitEthernet PPP
Value Ingress Egress Ingress Egress
adaptive
average X
fecn-adapt
max-buffers
peak