Mpls Cos Multi-Vc Mode; Feature History For Mpls Cos Multi-Vc Mode - Cisco 10000 Series Configuration Manual
Quality of service configuration guide
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MPLS CoS Multi-VC Mode
set mpls experimental imposition 7
class exp7
set mpls experimental imposition 0
!
interface GigabitEthernet3/0/0.2
encapsulation dot1Q 2
ip vrf forwarding vrf_2
ip address 220.220.56.6 255.255.255.0
service-policy input exp2exp
tag-switching ip
MPLS CoS Multi-VC Mode
The Multiprotocol Label Switching Class of Service (MPLS CoS) Multi-Virtual Circuit (VC) Mode
feature on the Cisco 10000 router provides multi-VC support on the performance routing engine (part
number PRE1) and extends QoS functionality to Label-Controlled Asynchronous Transfer Mode
(LC-ATM) and multi-VC subinterfaces in a service provider MPLS-enabled network. Such a network
incorporates ATM interfaces on the edge of the network, as well as ATM interfaces within the core of
the network.
The MPLS CoS Multi-VC Mode feature enables you to map the experimental (EXP) field values of an
MPLS label to an ATM VC to create sets of labeled virtual circuits (LVCs). Each set, called an LVC
Service Group, consists of multiple LVCs and each LVC is treated as a member of the set. All members
of a set are associated with a label-switched path (LSP) that is set up between a pair of ATM-connected
routers in the user's networking environment. Each member of the set may have a different quality of
service from other members of the set.
By using multi-VC sets, you can provide differentiated services to users of MPLS-enabled service
provider networks. To provide this service differentiation, the provider edge (PE) router in the service
provider network sets an appropriate value in the EXP field in the header of each incoming packet as it
is received. A standard IP access list (ACL) together with a class of service (CoS) map and a prefix map
are used to specify the number of classes (and LVCs) per IP destination. For information on a CoS map,
see
Each MPLS-enabled ATM interface in the service provider network, including each ATM edge interface
and each ATM router or switch interface within the core of the network, provides QoS support in a
manner similar to that provided for IP packet interfaces. IP packets transiting the service provider's
MPLS-enabled network are treated with the same priorities as afforded ATM traffic. Accordingly, MPLS
CoS multi-VC functionality is virtually indistinguishable from the QoS support provided for IP packet
interfaces.
For more information, see the MPLS QoS Multi-VC Mode for PA-A3, Release 12.2(2)T feature module.
Feature History for MPLS CoS Multi-VC Mode
Cisco IOS Release
Release 12.0(27)S
Release 12.2(16)BX
Release 12.2(28)SB
Cisco 10000 Series Router Quality of Service Configuration Guide
20-12
the"Class of Service Map" section on page
Description
This feature was introduced on the router.
This feature was introduced on the PRE2.
This feature was integrated in Cisco IOS
Release 12.2(28)SB for the PRE2.
Chapter 20
Configuring Quality of Service for MPLS Traffic
20-13.
Required PRE
PRE1
PRE2
PRE2
OL-7433-09
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