ZyXEL Communications Corporation 5VZ-A2011 ユーザーズマニュアル

CellPipe 7130 RG User’s Guide

The Diagnostic screens display information to help you identify problems with the 
CellPipe 7130 RG.

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.

• The General screen lets you ping an IP address or trace the route packets take 

to a host (

• The 802.1ag screen lets you perform CFM actions (

).

• The OAM Ping Test screen lets you send an ATM OAM (Operation, 

Administration and Maintenance) packet to verify the connectivity of a specific 

PVC. (

The following terms and concepts may help as you read through this chapter.

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.