Layer 2 Circuit Overview

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A Layer 2 circuit is a point-to-point Layer 2 connection transported by means of Multiprotocol Label Switching (MPLS) or another tunneling technology on the service provider’s network. A Layer 2 circuit is similar to a circuit cross-connect (CCC), except that multiple Layer 2 circuits can be transported over a single label-switched path (LSP) tunnel between two provider edge (PE) routers. In contrast, each CCC requires a dedicated LSP.

This chapter discusses the following topics:

Layer 2 Circuit Overview
Layer 2 Circuit Standards
Layer 2 Circuit Policy
Layer 2 Circuit Bandwidth Accounting and Call Admission Control
Layer 2 Circuits Trunk Mode

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