Specifications

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Cisco MWR 2941 Mobile Wireless Edge Router Release 3.5 Software Configuration Guide, Cisco IOS Release 15.1(3)MR
OL-26895-01
Chapter 15 Configuring Ethernet OAM, CFM, and E-LMI
Understanding E-LMI
To disable Ethernet terminal configuration, enter the no ethernet loopback interface configuration
command.
For more information about Ethernet loopback commands, see the Cisco MWR 2941 Mobile Wireless
Edge Router IOS Command Reference, Release 15.1(1)MR.
Understanding E-LMI
Ethernet Local Management Interface (E-LMI) is a protocol between the customer-edge (CE) device and
the provider-edge (PE) device. It runs only on the PE-to-CE UNI link and notifies the CE device of
connectivity status and configuration parameters of Ethernet services available on the CE port. E-LMI
interoperates with an OAM protocol, such as CFM, that runs within the provider network to collect OAM
status. CFM runs at the provider maintenance level (UPE to UPE with inward-facing MEPs at the UNI).
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 either the customer-edge device or the provider-edge device.
Note The Cisco MWR 2941 does not support Ethernet Virtual Connections (EVCs).
Note The Cisco MWR 2941 does not support OAM Manager.
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
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.
Note The Cisco MWR 2941 does not support Ethernet Virtual Connections (EVCs).
This section includes this information:
• Default E-LMI Configuration, page 15-47
• Enabling E-LMI, page 15-47