Cisco A9K-SIP-700 Service Configuration Guide

Modular QoS Deployment Scenarios on Cisco ASR 9000 Series Routers
MPLS QoS
QC-176
Cisco ASR 9000 Series Aggregation Services Router Modular Quality of Service Configuration Guide
OL-23108-02
MPLS Uniform Mode
In uniform mode (shown in Figure 3), there is only one DiffServ marking that is relevant for a packet
when traversing the MPLS network. If the DiffServ marking of the packet is modified within the MPLS
network, the updates information is the one considered meaningful at the egress of the LSP. Any changes
to the packet marking within the MPLS network are permanent and get propagated when the packet
leaves the MPLS network.
Figure 3 Uniform Mode
MPLS Pipe Mode
In pipe mode (shown in Figure 4), two markings are relevant for a packet when traversing the MPLS
network. First, the marking used by intermediate nodes along the LSP span including the egress LSR.
Second, the original marking carried by the packet before entering the MPLS network that will continue
to be used once the packet leaves the MPLS network. Any changes to the packet marking within the
MPLS network are not permanent and do not get propagated when the packet leaves the MPLS network.
Ta b l e 1 Overview of MPLS Tunneling Modes
Tunneling
Mode
IP-to-Label Label-to-Label Label-to-IP
Uniform Copy IP precedence
/DiffServ to MPLS EXP
MPLS EXP copied Copy MPLS EXP to IP
precedence/DiffServ
Pipe MPLS EXP set according to
service provider policy
MPLS EXP copied Preserve IP precedence
/DiffServ
Forwarding treatment based
on MPLS EXP
Short Pipe MPLS EXP set according to
service provider policy
MPLS EXP copied Preserve IP precedence
/DiffServ
Forwarding treatment based
on IP precedence/DiffServ
279789
DSCP = 5 DSCP = 5DSCP = 5
EXP = 5
EXP = 5
DSCP = 5
EXP = 5
EXP = 5
DSCP = 5
EXP = 5
Ingress
PE
PP
Egress
PE
LSP

Cisco A9K-SIP-700 Specifications

General

Brand	Cisco
Model	A9K-SIP-700
Category	Network Router
Language	English