Cisco ASR 903 Guide

QoS
▀ Configuration for BGP PIC & RFC3107 (with ISIS)
▄ Cisco ASR 903 Router Design and Deployment Guide
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OL-30526-01
service-policy GRAND_CHILD
class vlan30
shape average 50000000
service-policy GRAND_CHILD
! port level
policy-map PARENT
class class-default
shape average 200000000
service-policy CHILD
interface GigabitEthernet0/1/3
no ip address
negotiation auto
service-policy output PARENT
service instance 10 ethernet
encapsulation dot1q 10
rewrite ingress tag pop 1 symmetric
bridge-domain 10
!
service instance 20 ethernet
encapsulation dot1q 20
rewrite ingress tag pop 1 symmetric
bridge-domain 20
!
service instance 30 ethernet
encapsulation dot1q 30
rewrite ingress tag pop 1 symmetric
bridge-domain 30
Not all the policy has to be three-level policy and here are some other choices.
Two-Level Policy
• Topmost policy: match vlan
• Lowest policy: match qos-group/match prec/match cos/match dscp
Two-Level Policy
• Topmost policy: class-default
• Lowest policy: match vlan
Two-Level Policy
• Topmost policy: class-default
• Lowest policy: match mpls experimental topmost
Flat policy: match ip dscp
Flat policy: match vlan inner
Flat policy: class-default
As a best practice, it is recommended to mark ingress packets into internal qos-group and then take action based on
those qos-groups. Qos-groups are internal entities on the router and there are 100 usable qos-groups.

Cisco ASR 903 Specifications

General

Form Factor	Modular
Storage Temperature	-40°C to 70°C (-40°F to 158°F)
Humidity	5% to 95% non-condensing
Redundancy	Yes, redundant power supplies and route processors
Operating System	Cisco IOS XE
Power Supply	AC or DC
Switching Capacity	240 Gbps
Operating Temperature	-40°C to 65°C (-40°F to 149°F)
MTBF	200, 000 hours
Supported Protocols	IPv4, IPv6, MPLS, L2VPN, L3VPN
Interfaces	Gigabit Ethernet, 10 Gigabit Ethernet, T1/E1