Juniper ACX2000 Configuration Guide

The E-LMI protocol on ACX Series routers supports Layer 2 circuit and Layer 2 VPN EVC
types and enables link-loss forwarding for pseudowire (Layer 2 circuit and Layer 2 VPN)
services as follows:
•
Interworking between the connectivity fault management (CFM) protocol and the
E-LMI protocol for Layer 2 circuit and Layer 2 VPN.
•
End-to-end CFM session between UNIs to monitor EVC status.
•
In the case of pseudowire redundancy, CFM can be used to monitor active and backup
pseudowire sessions. The EVC status is declared as down to CE devices only when
both the active and backup pseudowire sessions go down.
•
Interworking between remote defect indication (RDI) and E-LMI for Layer 2 circuit and
Layer 2 VPN.
•
If a maintenance association end point (MEP) receives an RDI bit set in a continuity
check message (CCM) frame, and if RDI fault detection is enabled in the EVC
configuration at [edit protocols oam ethernet evcs evc-id evc-protocol cfm
management-domain name management-association name faults rdi], then the
pseudowire is declared as down to CE routers through E-LMI.
•
If an end-to-end CFM session does not exist between UNIs, the pseudowire (Layer 2
circuit or Layer 2 VPN) up and down state triggers an asynchronous EVC state change
message to CE routers through E-LMI.
NOTE: ACX Series routers do not support E-LMI for Layer 2 services (bridging).
Configuring the Ethernet Local Management Interface
To configure E-LMI, perform the following steps:
•
Configuring an OAM Protocol (CFM) on page 1115
•
Assigning the OAM Protocol to an EVC on page 1115
•
Enabling E-LMI on an Interface and Mapping CE VLAN IDs to an EVC on page 1116
Configuring an OAM Protocol (CFM)
For information about configuring the OAM protocol (CFM), see IEEE 802.1ag OAM
Connectivity Fault Management Overview.
Assigning the OAM Protocol to an EVC
To assign an OAM protocol to an EVC, you must specify a name for the EVC by using the
evcs evc-id statement at the [edit protocols oam ethernet] hierarchy level. You can set
the evc-protocol statement to cfm, l2circuit, or l2vpn to monitor the EVC status and its
options at the [edit protocols oam ethernet evcs] hierarchy level. You can configure the
number of remote UNIs in the EVC by using the remote-uni-count number statement. The
remote-uni-count value defaults to 1.
1115Copyright © 2017, Juniper Networks, Inc.
Chapter 34: Configuring Operations, Administration, and Management (OAM)

Juniper ACX2000 Specifications

General

Brand	Juniper
Model	ACX2000
Category	Network Router
Language	English