Modular QoS Deployment Scenarios on Cisco ASR 9000 Series Routers
Frame Relay QoS
QC-163
Cisco ASR 9000 Series Aggregation Services Router Modular Quality of Service Configuration Guide
OL-23108-02
• Do active queue management during traffic congestion on an interface by giving preferential
treatment to traffic (bigger thresholds) or set up smaller thresholds for out-of-profile traffic based
on a DEI value.
Mark DEI Based on a Policing Action: Example
In this example, the police rate is set to 5 Mbps. Conforming traffic is marked with a DEI value of 0;
traffic that exceeds the police rate is marked with a DEI value of 1.
policy-map 1ad-mark-dei
class c1
police rate 5 mbps
conform-action set dei 0
exceed-action set dei 1
end-policy-map
Mark DEI Based on Incoming Fields: Example
In this example, 802.1ad CoS plus DEI is derived from the incoming 802.1q CoS. Packets with a CoS
value of 0 are remarked with a DEI value of 1.
class-map match-any remark-cos
match cos 0
end-class-map
policy-map p1
class remark-cos
set dei 1
end-policy-map
interface GigabitEthernet0/4/0/39.1 l2transport
encapsulation dot1q 1
rewrite ingress tag push dot1ad 5 symmetric
service-policy input p1
!
Congestion Management Using DEI: Example
In this example, congestion is managed by dropping packets with a DEI value of 1 before dropping
packets with a DEI value of 0.
policy-map dei-sample
class class-default
random-detect dei 1 1000 6000
random-detect dei 0 5000 10000
end-policy-map
Frame Relay QoS
The main difference between Frame Relay QoS and other interface types is that you can perform:
• Frame Relay DLCI classification
• Frame Relay DE classification
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