Cisco Cisco IOS Software Release 12.2(33)SRE

Ethernet LMI must be enabled for the Remote Port Shutdown feature to function.

Connectivity Fault Management and Lightweight Directory Protocol (LDP) cannot be configured at 
the same time.

To configure the Remote Port Shutdown feature, you should understand the following concepts:

An Ethernet virtual circuit (EVC) as defined by the Metro Ethernet Forum is a port level point-to-point 
or multipoint-to-multipoint Layer 2 circuit. EVC status can be used by a CE device to find an alternative 
path into the service provider network or in some cases, fall back to a backup path over Ethernet or over 
another alternative service such as Frame Relay or ATM.

Ethernet LMI is an Ethernet Operations, Administration, and Maintenance (OAM) protocol between a 
CE device and a Provider Edge (PE) device. Ethernet LMI provides information that enables 
autoconfiguration of CE devices and provides the status of EVCs for large Ethernet metropolitan area 
networks (MANs) and WANs. Specifically, Ethernet LMI runs only on the PE-CE user network interface 
(UNI) link and notifies a CE device of both the operating state of an EVC and the time when an EVC is 
added or deleted. Ethernet LMI also communicates the attributes of an EVC. 

Ethernet LMI interoperates with Ethernet Connectivity Fault Management (CFM) and LDP. In this case 
Ethernet LMI relies on the OAM manager to interwork with LDP to report remote link status to the local 
CE. 

The OAM manager is an infrastructure element that streamlines interaction between OAM protocols. 
The OAM manager requires two interworking OAM protocols, in this case Ethernet LMI and MPLS 
LDP.