Benefits Of Mpls Cos Multi-Vc Mode; Restrictions For Mpls Cos Multi-Vc Mode; Prerequisites For Mpls Cos Multi-Vc Mode - Cisco 10000 Series Configuration Manual

Chapter 20 Configuring Quality of Service for MPLS Traffic

Benefits of MPLS CoS Multi-VC Mode

The MPLS CoS Multi-VC Mode feature has the following benefits:
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Restrictions for MPLS CoS Multi-VC Mode

The MPLS CoS Multi-VC Mode feature has the following restrictions:
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Prerequisites for MPLS CoS Multi-VC Mode

The MPLS CoS Multi-VC Mode feature has the following requirements:
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Ensures effective deployment of differentiated service classes in an MPLS-enabled ATM network
Leverages the use of existing ATM infrastructures
A multi-VC service group can have up to four LVCs.
The Cisco 10000 series router supports a maximum of 500 LVC service groups.
The Cisco 10000 series router does not support available bit rate (ABR) for ATM VCs. Therefore,
the router also does not support ABR LVCs.
All LVCs and the control-VC share the same QoS policy. Any QoS policy changes are applied to the
subinterface. All LVCs will then automatically share the new policy.
The Cisco 10000 series router must be running Cisco IOS Release 12.0(27)S or later releases.
The performance routing engine (PRE), part number PRE1 must be installed in the router's chassis.
To use MPLS QoS to full advantage in your network, the following functionality must be supported:
Multiprotocol Label Switching (MPLS)—The standardized label switching protocol defined by
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the Internet Engineering Task Force (IETF).
Cisco Express Forwarding (CEF)—An advanced Layer 3 IP switching technology that
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optimizes performance and scalability in networks that handle large volumes of traffic and
exhibit dynamic traffic patterns.
Asynchronous Transfer Mode (ATM)—International standard for cell relay in which multiple
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service types (such as voice, video, or data) are conveyed in fixed-length cells. ATM signaling
is required if you use ATM interfaces in your network.
The following QoS features are required:
MPLS CoS Multi-VC Mode to provide QoS functionality on ATM interfaces in a service
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provider MPLS-enabled network.
Class-based weighted fair queueing (CBWFQ) to allocate bandwidth fairly to all network
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traffic.
Weighted random early detection (WRED) to configure different discard priorities or classes of
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service using the MPLS experimental field in the MPLS packet header.
Cisco 10000 Series Router Quality of Service Configuration Guide
MPLS CoS Multi-VC Mode
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