Specifications

1-14
Cisco MWR 2941 Mobile Wireless Edge Router Software Configuration Guide, Release 12.2(33)MRB
OL-21227-02
Chapter 1 Cisco MWR 2941 Router Overview
Features
Ethernet Connectivity Fault Management (CFM)
The Cisco MWR 2941 supports Ethernet Connectivity Fault Management (CFM) as defined in 802.1ag
Draft 1.0. Ethernet Connectivity Fault Management (CFM) is an end-to-end per-service-instance
Ethernet layer operations, administration, and maintenance (OAM) protocol. It includes proactive
connectivity monitoring, fault verification, and fault isolation for large Ethernet metropolitan-area
networks (MANs) and WANs.
Ethernet CFM provides the following benefits:
• End-to-end service-level OAM technology
• Reduced operating expense for service provider Ethernet networks
• Competitive advantage for service providers
Note Release 12.2(33)MRA supports the Draft 1.0 version of Ethernet CFM; it does not support the IEEE
802.1ag-2007 version.
For instructions on how to configure CFM, see the “Configuring Ethernet CFM” section on page 4-30.
Ethernet Local Management Interface (E-LMI)
Ethernet Local Management Interface (LMI) is an Ethernet layer operation, administration, and
management (OAM) protocol. It provides information that enables autoconfiguration of customer edge
(CE) devices and provides the status of Ethernet virtual connections (EVCs) for large Ethernet
metropolitan-area networks (MANs) and WANs. Specifically, Ethernet LMI notifies a CE device of the
operating state of an EVC and the time when an EVC is added or deleted. Ethernet LMI also
communicates the attributes of an EVC and a user-network interface (UNI) to a CE device.
For instructions on how to configure E-LMI, see the “Configuring Ethernet Local Management Interface
(E-LMI)” section on page 4-38.
Clocking and Timing
The following sections describe the clocking and timing features available on the Cisco MWR 2941.
• Network Clocking Overview
• Precision Timing Protocol (PTP)
• Pseudowire-based Clocking
• Synchronous Ethernet
Network Clocking Overview
Clock synchronization is important for a variety of applications, including synchronization of radio cell
towers. While legacy TDM protocols incorporate timing features, packet-switched networks such as
Ethernet do not natively include these features. The Cisco MWR 2941 supports legacy TDM
technologies while supporting a variety of technologies that distribute clocking information over
packet-switched networks.