Mark Dei Based On A Policing Action: Example - Cisco ASR 9000 Series Configuration Manual

Modular QoS Deployment Scenarios
You can manage congestion based on the Drop Eligible Indicator (DEI) bit that is present in 802.1ad frames
and 802.1ah frames. DEI support includes the ability to:
• Do weighted random early detection (WRED) based on the value of the DEI bit.
• Do active queue management during traffic congestion on an interface by giving preferential treatment

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
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
end-policy-map
Frame Relay QoS
The main difference between Frame Relay QoS and other interface types is that you can perform:
to traffic (bigger thresholds) or set up smaller thresholds for out-of-profile traffic based on a DEI value.
conform-action set dei 0
exceed-action set dei 1
random-detect dei 1 1000 6000
random-detect dei 0 5000 10000
Cisco ASR 9000 Series Aggregation Services Router Modular Quality of Service Configuration Guide, Release 6.1.x
Mark DEI Based on a Policing Action: Example
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