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10-49
Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter 10 Configuring Ethernet OAM
Understanding E-LMI
OAM manager, which streamlines interaction between any two OAM protocols, handles the interaction
between CFM and E-LMI. This interaction is unidirectional, running only from OAM manager to E-LMI
on the UPE side of the router. Information is exchanged either as a result of a request from E-LMI or
triggered by OAM when it received notification of a change from the OAM protocol. This type of
information is relayed:
• EVC name and availability status
• Remote UNI name and status
• Remote UNI counts
You can configure Ethernet virtual connections (EVCs), service VLANs, UNI ids (for each CE-to-PE
link), and UNI count and attributes. You need to configure CFM to notify the OAM manager of any
change to the number of active UNIs and or the remote UNI ID for a given S-VLAN domain.
You can configure the router as a provider-edge device.
Restrictions
E-LMI is not supported for the service instances in which the pseudowire cross-connects are configured.
Configuring E-LMI
For E-LMI to work with CFM, you configure EVCs, EFPs, and E-LMI customer VLAN mapping. Most
of the configuration occurs on the PE device on the interfaces connected to the CE device. On the CE
device, 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 contains the following topics:
• Default E-LMI Configuration, page 10-49
• Enabling E-LMI, page 10-50
• Displaying E-LMI Information, page 10-51
Default E-LMI Configuration
Ethernet LMI is globally disabled by default. When enabled, the router 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.