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H A P T E R
This chapter explains the Diagnostic screens.
8.1 CFM Overview
The route between a CO network and one of a CPE user may go through aggregated switches,
routers and/or DSLAMs owned by independent organizations. A connectivity fault point
generally takes time to discover and impacts on subscribers' network access. In order to
reduce management and maintenance requirements, the IEEE 802.1ag Connectivity Fault
Management (CFM) specification was developed to allow network administrators to identify
and manage connection faults. Through discovery and verification of packet paths, CFM can
detect and analyze connectivity faults in bridged LANs.
The figure shown below is an example of a connection fault between switches on the LAN.
CFM can be used to identify and manage this kind of connection problem.
Figure 90 Management for any Fault in Bridges
CPE
8.1.1 How CFM Works
To enable CFM, a pro-active Connectivity Check (CC) between two CFM-aware devices in
the same MD (Maintenance Domain) network takes place. An MA (Maintenance Association)
defines a VLAN and associated ports on the device under an MD level. In this MA, a port can
be an MEP (Maintenance End Point) port or an MIP (Maintenance Intermediate Point) port.
MSC1000G/1024G/1224G Series User's Guide
Diagnostic Screens
Internet
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CO
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Troubleshooting
