December 2015
Intermediate to advanced
920 pages
23h 28m
English
Content preview from MPLS in the SDN Era
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Chapter 16. Scaling MPLS Transport and Seamless MPLS
Today, our industry is experiencing a paradigm shift in service provider (SP) networking: network applications are becoming independent from the transport layers. Modern, cloud-based SP applications need flexible, intelligent overlay network services and are not well-served by legacy, static, low-layer data transmission.
This trend is driven by many factors:
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Increased demand to bring the service delivery point closer to the user. IP devices are progressively replacing legacy Layer 2 (L2) network elements, hence partitioning the L2 domains.
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More “intelligent” features for fast protection available at the IP/MPLS layer that could replace the corresponding fast protection features of optical networks.
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Shifting of mobile traffic—traditionally delivered over TDM circuits—toward Ethernet, and subsequently toward IP in 3G (e.g., Universal Mobile Telecommunications System [UMTS]), or 4G (e.g., Long-Term Evolution [LTE]), or small-cells networks.
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High-scale data centers shifting to MPLS fabrics and MPLS-enabled servers.
To cope with this demand, increasing the capacity of existing core (or spine) devices is necessary but not sufficient. The required presence of service endpoints in many small-range sites also relies on increasing the overall number of MPLS-enabled devices in the networks.
As a result of bringing the L3 edge closer to the end user, networks are witnessing the introduction of many small devices:
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In the edge ...
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