P-873HNU(P)-51B User’s Guide
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Diagnostic
32.1 Overview
The Diagnostic screens display information to help you identify problems with the VDSL Router.
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.
32.1.1 What You Can Do in this Chapter
• The Ping & TraceRoute & NsLookup 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. (
32.2 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.
• Loopback test - checks if the MEP port receives its Loop Back Response (LBR) from its target
after it sends the Loop Back Message (LBM). If no response is received, there might be a
connectivity fault between them.
• Link trace test - provides additional connectivity fault analysis to get more information on where
the fault is. If an MEP port does not respond to the source MEP, this may indicate a fault.
Administrators can take further action to check and resume services from the fault according to
the line connectivity status report.
Содержание P-873HNU-51B
Страница 4: ...Contents Overview P 873HNU P 51B User s Guide 4...
Страница 13: ...Table of Contents P 873HNU P 51B User s Guide 13 Appendix F Legal Information 329 Index 333...
Страница 14: ...Table of Contents P 873HNU P 51B User s Guide 14...
Страница 15: ...15 PART I User s Guide...
Страница 16: ...16...
Страница 32: ...Chapter 2 The Web Configurator P 873HNU P 51B User s Guide 32...
Страница 57: ...57 PART II Technical Reference...
Страница 58: ...58...
Страница 64: ...Chapter 5 Network Map and Status Screens P 873HNU P 51B User s Guide 64...
Страница 108: ...Chapter 7 Wireless P 873HNU P 51B User s Guide 108...
Страница 132: ...Chapter 9 Static Routing P 873HNU P 51B User s Guide 132...
Страница 152: ...Chapter 10 Quality of Service QoS P 873HNU P 51B User s Guide 152...
Страница 168: ...Chapter 11 Network Address Translation NAT P 873HNU P 51B User s Guide 168...
Страница 182: ...Chapter 13 IGMP P 873HNU P 51B User s Guide 182...
Страница 188: ...Chapter 14 Interface Group P 873HNU P 51B User s Guide 188...
Страница 202: ...Chapter 17 Parental Control P 873HNU P 51B User s Guide 202...
Страница 224: ...Chapter 22 Logs P 873HNU P 51B User s Guide 224...
Страница 234: ...Chapter 25 xDSL Statistics P 873HNU P 51B User s Guide 234...
Страница 238: ...Chapter 26 Users Configuration P 873HNU P 51B User s Guide 238...
Страница 244: ...Chapter 27 Remote Management P 873HNU P 51B User s Guide 244...
Страница 250: ...Chapter 29 Logs Setting P 873HNU P 51B User s Guide 250...
Страница 256: ...Chapter 31 Configuration P 873HNU P 51B User s Guide 256...
Страница 262: ...Chapter 32 Diagnostic P 873HNU P 51B User s Guide 262...
Страница 274: ...Chapter 34 Product Specifications P 873HNU P 51B User s Guide 274...
Страница 310: ...Appendix C Pop up Windows JavaScript and Java Permissions P 873HNU P 51B User s Guide 310...
Страница 324: ...Appendix D Wireless LANs P 873HNU P 51B User s Guide 324...