Enterprise QoS Solution Reference Network Design Guide

Provider-Edge QoS Considerations
5-22
Enterprise QoS Solution Reference Network Design Guide
Chapter 5 MPLS VPN QoS Design
Figure 5-11 Five-Class Service Provider Model Short Pipe Mode Re-Marking Diagram
CE-to-PE
packets marked
with appropriate
DSCP values to
gain admission
into desired
SP Class.
EF
CS5
CS6
AF31
CS3
AF21
CS2
AF11
CS1
0
PE Classes
Real-Time
Critical
Data
Video
Bulk Data
Best-Effort
MPLS EXP values are set on ingress PE’s
ingress interface to reflect local SP policies.
Real-Time In Contract
Real-Time Out-of-Contract
(Dropped)
Critical Data In Contract
Critical Data Out-of-Contract
Video In Contract
Video Out-of-Contract
(Dropped)
Bulk Data In Contract
Bulk Data Out-of-Contract
Best-Effort In Contract
Best-Effort Out-of-Contract
MPLS EXP 5
MPLS EXP 3
MPLS EXP 7
MPLS EXP 2
MPLS EXP 1
MPLS EXP 6
MPLS EXP 0
MPLS EXP 4
Figure 5-12 shows the ingress PE ingress interface re-marking policies for Short Pipe Mode, based on
the re-marking diagram provided in Figure 5-11. No mapping from MPLS EXP to QoS Group is needed
on the egress PE’s ingress interface (as was required for Uniform Mode) because the MPLS EXP value
loses relevance beyond this interface.
Any egress policies on the egress PE’s egress interface (facing the customer’s destination CE), are based
on IP Precedence or DSCP values (which have remained untouched). This is the main difference between
Short Pipe Mode and Pipe Mode.
Figure 5-12 shows the interfaces in which explicit policy configuration is required for Short Pipe Mode
MPLS DiffServ tunneling.
Version 3.3