Junos® OS Ethernet Interfaces Configuration ... - Juniper Networks

Junos ®
OS 12.3 Ethernet Interfaces Configuration Guide
• Junos® OS Ethernet Interfaces
Configuring Ethernet Local Management Interface
• Ethernet Local Management Interface Overview on page 200
• Configuring the Ethernet Local Management Interface on page 202
• Example E-LMI Configuration on page 203
Ethernet Local Management Interface Overview
200
MX Series routers with Gigabit Ethernet (ge), 10-Gigabit Ethernet (xe), or Aggregated
Ethernet (ae) interfaces support the Ethernet Local Management Interface (E-LMI). The
E-LMI specification is available at the Metro Ethernet Forum. E-LMI procedures and
protocols are used for enabling automatic configuration of the customer edge (CE) to
support Metro Ethernet services. The E-LMI protocol also provides user-to-network
interface (UNI) and Ethernet virtual connection (EVC) status information to the CE. The
UNI and EVC information enables automatic configuration of CE operation based on the
Metro Ethernet configuration.
The E-LMI protocol operates between the CE device and the provider edge (PE) device.
It runs only on the PE-CE link and notifies the CE of connectivity status and configuration
parameters of Ethernet services available on the CE port. The scope of the E-LMI protocol
is shown in Figure 20 on page 200.
Figure 20: Scope of the E-LMI Protocol
UNI UNI
CE Metro Ethernet Network
CE
E-LMI E-LMI
The E-LMI implementation on MX Series routers includes only the PE side of the E-LMI
protocol.
E-LMI interoperates with an OAM protocol, such as Connectivity Fault Management
(CFM), that runs within the provider network to collect OAM status. CFM runs at the
provider maintenance level (UNI-N to UNI-N with up MEPs at the UNI). E-LMI relies on
the CFM for end-to-end status of EVCs across CFM domains (SVLAN domain or VPLS).
The E-LMI protocol relays the following information:
• Notification to the CE of the addition/deletion of an EVC (active, not active, or partially
active)
• Notification to the CE of the availability state of a configured EVC
• Communication of UNI and EVC attributes to the CE:
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