Csc Prerequisites; Csc Benefits - Cisco CRS Configuration Manual

CSC Prerequisites

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Throughout this document, the following terminology is used in the context of CSC:
backbone carrier—Service provider that provides the segment of the backbone network to the other provider.
A backbone carrier offers BGP and MPLS VPN services.
customer carrier—Service provider that uses the segment of the backbone network. The customer carrier
may be an Internet service provider (ISP) or a BGP/MPLS VPN service provider.
CE router—A customer edge router is part of a customer network and interfaces to a provider edge (PE)
router. In this document, the CE router sits on the edge of the customer carrier network.
PE router—A provider edge router is part of a service provider's network connected to a customer edge (CE)
router. In this document, the PE router sits on the edge of the backbone carrier network
ASBR—An autonomous system boundary router connects one autonomous system to another.
CSC Prerequisites
The following prerequisites are required to configure CSC:
• You must be able to configure MPLS VPNs with end-to-end (CE-to-CE router) pings working.
• You must be able to configure Interior Gateway Protocols (IGPs), MPLS Label Distribution Protocol
• You must ensure that CSC-PE and CSC-CE routers support BGP label distribution.
Note BGP is the only supported label distribution protocol on the link between CE and PE.

CSC Benefits

This section describes the benefits of CSC to the backbone carrier and customer carriers.
Benefits to the Backbone Carrier
• The backbone carrier can accommodate many customer carriers and give them access to its backbone.
• The MPLS VPN carrier supporting carrier feature is scalable.
• The MPLS VPN carrier supporting carrier feature is a flexible solution.
Benefits to the Customer Carriers
• The MPLS VPN carrier supporting carrier feature removes from the customer carrier the burden of
• Customer carriers who use the VPN services provided by the backbone carrier receive the same level
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CSC Benefits
Configuration Options for the Backbone and Customer Carriers
(LDP), and Multiprotocol Border Gateway Protocol (MP-BGP).
configuring, operating, and maintaining its own backbone.
of security that Frame Relay or ATM-based VPNs provide.
Implementing MPLS Layer 3 VPNs