C
HAPTER
15
| Basic Administration Protocols
Connectivity Fault Management
– 449 –
C
ONNECTIVITY
F
AULT
M
ANAGEMENT
Connectivity Fault Management (CFM) is an OAM protocol that includes
proactive connectivity monitoring using continuity check messages, fault
verification through loop back messages, and fault isolation by examining
end-to-end connections between provider edge devices or between
customer edge devices.
CFM is implemented as a service level protocol based on service instances
which encompass only that portion of the metropolitan area network
supporting a specific customer. CFM can also provide controlled
management access to a hierarchy of maintenance domains (such as the
customer, service provider, and equipment operator).
This switch supports functions for defining the CFM structure, including
domains, maintenance associations, and maintenance access points. It
also supports fault detection through continuity check messages for all
known maintenance points, and cross-check messages which are used to
verify a static list of remote maintenance points located on other devices
(in the same maintenance association) against those found through
continuity check messages. Fault verification is supported using loop back
messages, and fault isolation with link trace messages. Fault notification is
also provided by SNMP alarms which are automatically generated by
maintenance points when connectivity faults or configuration errors are
detected in the local maintenance domain.
Key Components of CFM
CFM provides restricted management access to each Service Instance
using a structured conceptual network based on these components:
◆
A Maintenance Domain defines a part of the network controlled by a
single operator, and supports management access to the domain
through Domain Service Access Points (DSAPs) configured on the
domain boundary, as well as connectivity testing between these DSAPs.
◆
A Maintenance Association (MA) contains the DSAPs for an individual
Service Instance. DSAPs are the primary maintenance points used to
monitor connectivity across a maintenance domain, and are the entry
points to the paths which interconnect the access points allocated to a
service instance.
◆
A Maintenance Level allows maintenance domains to be nested in a
hierarchical fashion, providing access to the specific network portions
required by each operator. Domains at lower levels may be either
hidden or exposed to operators managing domains at a higher level,
allowing either course or fine fault resolution.
◆
Maintenance End Points (MEPs) which provide full CFM access to a
Service Instance (i.e., a specific MA), and Maintenance Intermediate
Points (MIPs) which are passive entities that merely validate received
CFM messages, or respond to link trace and loop back requests. MIPs
are the interconnection points that make up all possible paths between
Summary of Contents for ECS4810-12M Layer 2
Page 1: ...Management Guide www edge core com ECS4810 12M Layer 2 Gigabit Ethernet Switch...
Page 2: ......
Page 4: ......
Page 6: ...ABOUT THIS GUIDE 6...
Page 54: ...SECTION I Getting Started 54...
Page 64: ...CHAPTER 1 Introduction System Defaults 64...
Page 82: ...CHAPTER 2 Initial Switch Configuration Managing System Files 82...
Page 84: ...SECTION II Web Configuration 84...
Page 102: ...CHAPTER 3 Using the Web Interface Navigating the Web Browser Interface 102...
Page 206: ...CHAPTER 6 VLAN Configuration Configuring VLAN Mirroring 206...
Page 256: ...CHAPTER 11 Class of Service Layer 3 4 Priority Settings 256...
Page 378: ...CHAPTER 14 Security Measures DHCP Snooping 378...
Page 520: ...CHAPTER 16 IP Configuration Setting the Switch s IP Address IP Version 6 520...
Page 528: ...CHAPTER 17 IP Services Displaying the DNS Cache 528...
Page 586: ...CHAPTER 19 Using the Command Line Interface CLI Command Groups 586...
Page 676: ...CHAPTER 22 SNMP Commands 676...
Page 684: ...CHAPTER 23 Remote Monitoring Commands 684...
Page 816: ...CHAPTER 27 Access Control Lists ACL Information 816...
Page 866: ...CHAPTER 30 Port Mirroring Commands RSPAN Mirroring Commands 866...
Page 884: ...CHAPTER 32 Automatic Traffic Control Commands 884...
Page 890: ...CHAPTER 33 Address Table Commands 890...
Page 986: ...CHAPTER 37 Class of Service Commands Priority Commands Layer 3 and 4 986...
Page 1006: ...CHAPTER 38 Quality of Service Commands 1006...
Page 1068: ...CHAPTER 39 Multicast Filtering Commands Multicast VLAN Registration 1068...
Page 1092: ...CHAPTER 40 LLDP Commands 1092...
Page 1134: ...CHAPTER 41 CFM Commands 1134...
Page 1154: ...CHAPTER 43 Domain Name Service Commands 1154...
Page 1160: ...CHAPTER 44 DHCP Commands DHCP Client 1160...
Page 1194: ...CHAPTER 45 IP Interface Commands IPv6 Interface 1194...
Page 1196: ...SECTION IV Appendices 1196...
Page 1202: ...APPENDIX A Software Specifications Management Information Bases 1202...
Page 1224: ...COMMAND LIST 1224...
Page 1234: ...INDEX 1234...
Page 1235: ......