Specifications

17-52
System Management Software Configuration Guide for Cisco IE 2000U and Connected Grid Switches
Chapter 17 Configuring Ethernet OAM, CFM, and E-LMI
Configuring E-LMI
• Remote UNI counts (the total number of expected UNIs and the actual number of active UNIs)
The asynchronous update is triggered only when the number of active UNIs has changed.
CFM Interaction with OAM Manager
When there is a change in the number of active UNIs or remote UNI ID for a given S-VLAN or domain,
CFM asynchronously notifies the OAM manager. A change in the number of UNIs might (or might not)
cause a change in EVC status. OAM manager calculates EVC status given the number of active UNIs
and the total number of associated UNIs.
Note If crosscheck is disabled, no SNMP traps are sent when there is a change in the number of UNIs.
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 the following topics:
• Default E-LMI Configuration, page 17-52
• E-LMI and OAM Manager Configuration Guidelines, page 17-52
• Configuring the OAM Manager, page 17-53
• Enabling E-LMI, page 17-56
• Ethernet OAM Manager Configuration Example, page 17-58
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.