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Metro Ethernet by Sam Halabi

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L2 Ethernet Services over an IP/MPLS Network

The inherent properties of an IP/MPLS network mitigate most of the scalability issues by design. IP and MPLS have been widely deployed in large service provider networks, and these protocols have been fine-tuned over the years to offer high levels of stability and flexibility. Table 4-1 shows a brief comparison of the merits of IP/MPLS versus L2 Ethernet networks.

Table 4-1. Comparing Ethernet and IP/MPLS
FeatureEthernetIP/MPLS
SignalingNo signalingLDP, RSVP-TE, and so on
Loop-free topologyBlocked ports via Spanning Tree ProtocolYes, via routing protocols and Time To Live
User and service identificationVLAN ID space limitedLabel space more scalable
Traffic engineering (TE)No TERSVP-TE
RestorationVia STP ...

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