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Networks and Services: Carrier Ethernet, PBT, MPLS-TP, and VPLS by Mehmet Toy

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Chapter 10: Carrier Ethernet Local Management Interface

10.1 Introduction

Ethernet local management interface (ELMI) protocol defined in Reference 1 operates between the customer edge (CE) device and network edge (NE) of service provider. It defines the protocol and procedures allowing autoconfiguration of the CE (customer equipment) device by the service provider's NE device (Fig. 10.1). The ELMI protocol also provides the means of notification of the status of an EVC and UNI, and enables the CE to request and receive status and service attributes information [2] from the MEN, so that it can configure itself to access Metro Ethernet services.

Figure 10.1 Ethernet local management interface.

10.1

ELMI is a protocol that is terminated by the UNI-C on the CE side of the UNI and by the UNI-N on the MEN side of the UNI (Fig. 10.2).

Figure 10.2 ELMI termination in functional components.

10.2

The ELMI protocol includes the following procedures:

  • Notification to the CE device of the addition of an EVC: the respective CPEs are informed of the availability of a new EVC once the service provider turns on the service. Furthermore, the service end points are notified of the corresponding CE-VLAN ID to be used by a given service.
  • Notification to the CE device of the deletion of an EVC.
  • Notification to ...

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