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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
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Chapter 39 Configuring Ethernet OAM, CFM, and E-LMI
Configuring E-LMI
Configuring E-LMI
For E-LMI to work with CFM, you configure Ethernet virtual connections (EVCs), Ethernet service
instances (EFPs), and E-LMI customer VLAN mapping. Most of the configuration occurs on the PE
switch on the interfaces connected to the CE device. On the CE switch, you only need to enable E-LMI
on the connecting interface. Note that you must configure some OAM parameters, for example, EVC
definitions, on PE devices on both sides of a metro network.
This section includes this information:
• Default E-LMI Configuration, page 39-26
• E-LMI and OAM Manager Configuration Guidelines, page 39-26
• Configuring the OAM Manager, page 39-27
• Enabling E-LMI, page 39-29
• Ethernet OAM Manager Configuration Example, page 39-30

Default E-LMI Configuration

Ethernet LMI is globally disabled by default. When enabled, the switch is in provider-edge (PE) mode
by default.
When you globally enable E-LMI by entering the ethernet lmi global global configuration command,
it is automatically enabled on all interfaces. You can also enable or disable E-LMI per interface to
override the global configuration. The E-LMI command that is given last is the command that has
precedence.
There are no EVCs, EFP service instances, or UNIs defined.
UNI bundling service is bundling with multiplexing.

E-LMI and OAM Manager Configuration Guidelines

OAM manager is an infrastructural element and requires two interworking OAM protocols, in this case
CFM and E-LMI. For OAM to operate, the PE side of the connection must be running CFM and E-LMI.
• CFM is supported only when the metro IP access or metro access image is running on the switch.
• E-LMI is not supported on routed ports, EtherChannel port channels or ports that belong to an
EtherChannel, private VLAN ports, or IEEE 802.1Q tunnel ports.
• You cannot configure E-LMI on VLAN interfaces.
• When you enable E-LMI globally or on an interface, the switch is in PE mode by default, You must
enter the ethernet lmi ce global configuration command to enable the switch or interface in
customer-edge mode.
• When the switch is configured as a CE device, the service instance and ethernet uni interface
commands are visible but not supported.