Ethernet Local Management Interface (E-Lmi) - Alcatel-Lucent 7750 Configuration Manual

Port Features

Ethernet Local Management Interface (E-LMI)

The Ethernet Local Management Interface (E-LMI) protocol is defined in Metro Ethernet Forum
(MEF) technical specification MEF16. This specification largely based on Frame Relay - LMI
defines the protocol and procedures that convey the information for auto-configuration of a CE
device and provides the means for EVC status notification. MEF16 does not include link
management functions like Frame Relay LMI does. In the Ethernet context that role is already
accomplished with Clause 57 Ethernet OAM (formerly 802.3ah).
The SR OS currently implements the User Network Interface-Network (UNI-N) functions for
status notification supported on Ethernet access ports with dot1q encapsulation type. Notification
related to status change of the EVC and CE-VLAN ID to EVC mapping information is provided as
a one to one between SAP and EVC.
The E-LMI frame encapsulation is based on IEEE 802.3 untagged MAC frame format using an
ether-type of 0x88EE. The destination MAC address of the packet 01-80-C2-00-00-07 will be
dropped by any 802.1d compliant bridge that does not support or have the E-LMI protocol
enabled. This means the protocol cannot be tunneled.
Status information is sent from the UNI-N to the UNI-C, either because a status enquiry was
received from the UNI-C or unsolicited. The Active and Not Active EVC status are supported. The
Partially Active state is left for further study.
The bandwidth profile sub-information element associated with the EVC Status IE does not use
information from the SAP QoS policy. A value of 0 is used in this release as MEF 16 indicates the
bandwidth profile sub-IE is mandatory in the EVC Status IE. The EVC identifier is set to the
description of the SAP and the UNI identifier is set to the description configured on the port.
Further, the implementation associates each SAP with an EVC. Currently, support exists for CE-
VLAN ID/EVC bundling mode.
As stated in the OAM Mapping section in the OAM and Diagnostics Guide, E-LMI the UNI-N can
participates in the OAM fault propagation functions. This is a unidirectional update from the UNI-
N to the UNI-C and interacting with service manager of VLL, VPLS, VPRN and IES services.
Page 104 7750 SR Interface Configuration Guide