Policing And Marking; Preserving Ip Tos; Exp Mutation; Mpls Diffserv Tunneling Modes - Cisco WS-SUP32-GE-3B - Supervisor Engine 32 Software Configuration Manual

MPLS QoS Overview

Policing and Marking

Policing causes traffic that exceeds the configured rate to be discarded or marked down to a higher drop
precedence. Marking is a way to identify packet flows to differentiate them. Packet marking allows you
to partition your network into multiple priority levels or classes of service.
The MPLS QoS policing and marking features that you can implement depend on the received traffic
type and the forwarding operation applied to the traffic. See
page 39-23

Preserving IP ToS

The PFC3B automatically preserves the IP ToS during all MPLS operations including imposition,
swapping, and disposition.You do not need to enter a command to save the IP ToS.

EXP Mutation

You can configure up to eight egress EXP mutation maps to mutate the internal EXP value before it is
written as the egress EXP value. You can attach egress EXP mutation maps to these interface types:
•
•
•
•
You cannot attach EXP mutation maps to these interface types:
•
•
For configuration information, see
page

MPLS DiffServ Tunneling Modes

The PFC3B uses MPLS DiffServ tunneling modes. Tunneling provides QoS transparency from one edge
of a network to the other edge of the network. See the
page 39-31
MPLS QoS Overview
MPLS QoS enables network administrators to provide differentiated types of service across an MPLS
network. Differentiated service satisfies a range of requirements by supplying for each transmitted
packet the service specified for that packet by its QoS. Service can be specified in different ways, for
example, using the IP precedence bit settings in IP packets.
Catalyst Supervisor Engine 32 PISA Cisco IOS Software Configuration Guide, Release 12.2ZY
39-4
for information.
Optical service module (OSM) ports
LAN or OSM port subinterfaces
Layer 3 VLAN interfaces
Layer 3 LAN ports
Layer 2 LAN ports (switchports)
FlexWAN ports or subinterfaces
39-28.
for information.
"Configuring a Policy Map" section on
the"Configuring MPLS QoS Egress EXP Mutation" section on
"MPLS DiffServ Tunneling Modes" section on
Chapter 39 Configuring MPLS QoS
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