Mpls Short Pipe Mode; Uniform, Pipe, Short Pipe Modes: Ingress Pe Example - Cisco ASR 9000 Series Service Configuration Manual

Modular QoS Deployment Scenarios on Cisco ASR 9000 Series Routers
Note that the egress LSR still uses the marking that was used by intermediate LSRs. However, the egress
LSR has to remove all labels imposed on the original packet. In order to preserve this marking carried
in the labels, the edge LSR keeps an internal copy of the marking before removing the labels. This
internal copy is used to classify the packet on the outbound interface (facing the CE) once the labels are
removed. This is usually achieved using the set qos-group and match qos-group commands.
Figure 4
EXP Bits Set According to
Service Provider's Policy

MPLS Short Pipe Mode

The short pipe mode (shown in
that the egress LSR uses the original packet marking instead of using the marking used by the
intermediate LSRs.
Figure 5
EXP Bits Set According to
Service Provider's Policy

Uniform, Pipe, Short Pipe Modes: Ingress PE Example

This example shows how to implement the MPLS DiffServ and demonstrates the configuration needed
on the ingress PE. Only precedence 4 is being matched. Precedence 4 is mapped to EXP bits value 4 by
the policer, unless the bandwidth is exceeded, in which case the EXP bits are recolored to the value 2.
The egress interface configuration is not needed for the MPLS DiffServ uniform model, but it is added
to show how to perform QoS on the EXP bits.
OL-23108-02
Pipe Mode
EXP = 3
EXP = 3
DSCP = 5 DSCP = 5
Ingress
PE
Figure
Short Pipe Mode
EXP = 3
EXP = 3
DSCP = 5 DSCP = 5
Ingress
PE
Cisco ASR 9000 Series Aggregation Services Router Modular Quality of Service Configuration Guide
EXP = 3
EXP = 3 EXP = 3
DSCP = 5 DSCP = 5
LSP
P P
5), is a slight variation of the pipe mode. The only difference is
EXP = 3
EXP = 3 EXP = 3
DSCP = 5 DSCP = 5
LSP
P P
MPLS QoS
Scheduling and Discard
Behavior Based on EXP
DSCP = 5
Egress
PE
Scheduling and Discard
Behavior Based on DSCP
DSCP = 5
Egress
PE
QC-177