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Diagnostic
29.1 Overview
The Diagnostic screens display information to help you identify problems with the
The route between a CO VDSL switch and one of its CPE may go through switches owned by independent organizations. A connectivity fault point generally takes time to discover and impacts subscriber’s network access. In order to eliminate the management and maintenance efforts, IEEE 802.1ag is a Connectivity Fault Management (CFM) specification which allows network administrators to identify and manage connection faults. Through discovery and verification of the path, CFM can detect, analyze and isolate connectivity faults in bridged LANs.
29.1.1What You Can Do in this Chapter
•The General screen lets you ping an IP address or trace the route packets take to a host (Section 29.3 on page 380).
•The 802.1ag screen lets you perform CFM actions (Section 29.4 on page 381).
•The OAM Ping Test screen lets you send an ATM OAM (Operation, Administration and Maintenance) packet to verify the connectivity of a specific PVC. (Section 29.4 on page 381)
29.2 What You Need to Know
The following terms and concepts may help as you read through this chapter.
How CFM Works
A Maintenance Association (MA) defines a VLAN and associated Maintenance End Point (MEP) ports on the device under a Maintenance Domain (MD) level. An MEP port has the ability to send Connectivity Check Messages (CCMs) and get other MEP ports information from neighbor devices’ CCMs within an MA.
CFM provides two tests to discover connectivity faults.
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