VMG1312-B Series User’s Guide
284
C
H A P T E R
3 5
Diagnostic
35.1 Overview
The
D ia gn ost ic
screens display inform at ion t o help you ident ify problem s wit h t he Device.
The rout e bet ween a CO VDSL swit ch and one of it s CPE m ay go t hrough swit ches owned by
independent organizat ions. A connect ivit y fault point generally t akes t im e t o discover and im pact s
subscriber ’s net work access. I n order t o elim inat e t he m anagem ent and m aint enance effort s, I EEE
802.1ag is a Connect ivit y Fault Managem ent ( CFM) specificat ion which allows net work
adm inist rat ors t o ident ify and m anage connect ion fault s. Through discovery and verificat ion of t he
pat h, CFM can det ect , analyze and isolat e connect ivit y fault s in bridged LANs.
35.1.1 What You Can Do in this Chapter
• The
Pin g & Tr a ce Rou t e & N sLook up
screen let s you ping an I P address or t race t he rout e
packet s t ake t o a host (
) .
• The
8 0 2 .1 a g
screen let s you perform CFM act ions (
) .
• The
OAM Pin g Te st
screen let s you send an ATM OAM ( Operat ion, Adm inist rat ion and
Maint enance) packet t o verify t he connect ivit y of a specific PVC. (
) .
35.2 What You Need to Know
The following t erm s and concept s m ay help as you read t hrough t his chapt er.
How CFM Works
A Maint enance Associat ion ( MA) defines a VLAN and associat ed Maint enance End Point ( MEP) port s
on t he device under a Maint enance Dom ain ( MD) level. An MEP port has t he abilit y t o send
Connect ivit y Check Messages ( CCMs) and get ot her MEP port s inform at ion from neighbor devices’
CCMs wit hin an MA.
CFM provides t wo t est s t o discover connect ivit y fault s.
• Loopback t est - checks if t he MEP port receives it s Loop Back Response ( LBR) from it s t arget
aft er it sends t he Loop Back Message ( LBM) . I f no response is received, t here m ight be a
connect ivit y fault bet ween t hem .
• Link t race t est - provides addit ional connect ivit y fault analysis t o get m ore inform at ion on where
t he fault is. I f an MEP port does not respond t o t he source MEP, t his m ay indicat e a fault .
Adm inist rat ors can t ake furt her act ion t o check and resum e services from t he fault according t o
t he line connect ivit y st at us report .
Summary of Contents for VMG1312-B Series
Page 4: ...Contents Overview VMG1312 B Series User s Guide 4 Troubleshooting 289 ...
Page 14: ...Table of Contents VMG1312 B Series User s Guide 14 ...
Page 15: ...15 PART I User s Guide ...
Page 16: ...16 ...
Page 30: ...Chapter 2 The Web Configurator VMG1312 B Series User s Guide 30 ...
Page 35: ...Chapter 4 Tutorials VMG1312 B Series User s Guide 35 7 Click Apply to save your settings ...
Page 77: ...77 PART II Technical Reference ...
Page 78: ...78 ...
Page 166: ...Chapter 9 Routing VMG1312 B Series User s Guide 166 ...
Page 184: ...Chapter 10 Quality of Service QoS VMG1312 B Series User s Guide 184 ...
Page 210: ...Chapter 13 Interface Group VMG1312 B Series User s Guide 210 ...
Page 226: ...Chapter 15 Firewall VMG1312 B Series User s Guide 226 ...
Page 232: ...Chapter 17 Parental Control VMG1312 B Series User s Guide 232 ...
Page 242: ...Chapter 19 Certificates VMG1312 B Series User s Guide 242 ...
Page 246: ...Chapter 20 Log VMG1312 B Series User s Guide 246 ...
Page 250: ...Chapter 21 Traffic Status VMG1312 B Series User s Guide 250 ...
Page 256: ...Chapter 24 IGMP Status VMG1312 B Series User s Guide 256 ...
Page 260: ...Chapter 25 xDSL Statistics VMG1312 B Series User s Guide 260 ...
Page 262: ...Chapter 26 User Account VMG1312 B Series User s Guide 262 ...
Page 268: ...Chapter 29 TR 064 VMG1312 B Series User s Guide 268 ...
Page 272: ...Chapter 30 Time Settings VMG1312 B Series User s Guide 272 ...
Page 278: ...Chapter 32 Logs Setting VMG1312 B Series User s Guide 278 ...
Page 296: ...Chapter 36 Troubleshooting VMG1312 B Series User s Guide 296 ...
Page 336: ...Appendix C Pop up Windows JavaScripts and Java Permissions VMG1312 B Series User s Guide 336 ...
Page 350: ...Appendix D Wireless LANs VMG1312 B Series User s Guide 350 ...
Page 374: ...VMG1312 B Series User s Guide 374 Index ...