Mpls Tunneling Modes - Cisco 10000 Series Configuration Manual

Quality of service configuration guide

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Configuring Quality of Service for MPLS Traffic

MPLS Tunneling Modes

MPLS QoS provides QoS on MPLS packets using the following tunnel modes:

use these features in a network, set the MPLS experimental field value at PE1 (the ingress label

switching router) by using the modular QoS CLI. This sets the QoS value in the MPLS packet.

Short pipe tunnel mode discards the MPLS EXP value on label disposition. To enable MPLS EXP-based

classification after label disposition, you can map the EXP values to the qos-group values at the inbound

interface and use qos-group to classify packets into different classes at the outbound interface. However,

Weighted Random Early Detection (WRED) on the outbound interface is still based on the IP type of

service (ToS) value rather than the disposed EXP value.

The Cisco 10000 series router does not support the propagate-cos command to enable uniform mode.

The router does not copy the MPLS EXP values on disposition to the packet's IP header, unless you map

the EXP value to a qos-group value at the inbound interface and use the qos-group value to set the IP

ToS value on the outbound interface.

Uniform—Provides uniformity in per-hop behavior (PHB) throughout the network. In this mode, all

customers of your MPLS network use the same precedence settings.

Short Pipe—(Default) Provides for a distinct MPLS PHB layer (on top of the IP PHB layer) across

the entire MPLS network. In this mode, your customers implement their own IP PHB marking

Pipe—Similar to short pipe mode, except that at the egress of the provider edge (PE) router the

MPLS PHB layer is used to classify the packet for discard and scheduling behavior at the outbound

interface. In this mode, you schedule and discard packets without needing to know your customer

shows a service provider MPLS network that connects two sites of a customer's network. To

MPLS Network Connecting Two Sites of a Customer's IP Network

service provider

Cisco 10000 Series Router Quality of Service Configuration Guide

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