Definitive MPLS Network Designs [Electronic resources] نسخه متنی

Telecom Kingland Design Objectives

The architecture and design of the TK network was greatly influenced by the following objectives:

The next-generation network should align with the TK strategic vision of a packet-based, highly resilient, multiservice core. This core network should be surrounded by sophisticated edge devices offering feature-rich services.

All existing IP Services should be supported on multiservice edge devices interconnected via the MPC network.

Additional cost benefits should be realized through migration of PSTN trunking over the MPC network while ensuring the same quality of service as with the former PSTN network.

Ensure that the MPC network offers the level of service required by all the existing IP services, the PSTN trunking application, and any anticipated future services, such as pseudowire (including ATM pseudowire), Layer 2 VPNs, and Virtual Private LAN Service (VPLS).

Achieve the necessary quality of service while avoiding excessive overprovisioning in the core to control bandwidth costs.

Achieve the necessary resilience without additional capital expenses (such as additional equipment for protection of DWDM links).

Maximize the core's stability and performance by removing application-/service specific-functions from the core wherever possible. For example, turn the MPC network into an IPv4 BGP-free zone.

The rest of this chapter discusses the design TK selected to meet these objectives, from the viewpoints of routing, VPN, QoS, traffic engineering, network recovery, and IPv6.