This MIB module consists of two parts.
1) Auto-Ethernet-CFM Control:
2) ethernetJitter Stats:
The first part defines a mechanism to manage IP SLA
IP SLA is a capability which utilizes active monitoring for
network perfomance. It can be used for network
troubleshooting, network assessment and health monitoring.
IEEE 802.1ag defines Connection Fault Management (CFM) for
Ethernet layer. CFM can be used to detect, isolate and report
the connectivity faults, and allows discovery and verification
of the path through briges and LANs.
Auto-Ethernet-CFM operation integrates the capabilities of
IP SLA and IEEE 802.1ag. It's capable of discovering all the
existing MEPs in a specified VLAN or Ethernet Virtual Connection
within a specified maintenance domain. After which, it creates,
configures, and schedules an IP SLA operation for each MEP
IP SLA currently supports two types of operations for
end-to-end Ethernet connectivity - 'ethernetPing' and
'ethernetPing' can be used to monitor the connectivity and
measure RTT by sending the regular 802.1ag loopback frame
to a particular MEP.
'ethernetJitter' can be used to measure metrics such as
RTT, Jitter, frame loss, one-way latency by sending multiple
enhanced CFM frames at specified interval to a particular MEP.
Without Auto-Ethernet-CFM operation, the two types of operations
can also be created, configured, and scheduled manually through
CISCO-RTTMON-MIB by specifing the target MEP's identifier
in addition to the VLAN or Ethernet Virtual Connection and
With Auto-Ethernet-CFM operation, the two types of operations
will be created automatically. The Auto-Ethernet-CFM will pass
all the values specified in this module to the corresponding
objects in CISCO-RTTMON-MIB for each MEP discovered.
ipslaEthernetGrpCtrlTable -> rttMonCtrlAdminTable
ipslaEthernetGrpReactTable -> rttMonReactTable
The second part defines a collection of statistics resulting
from 'ethernetJitter' operation created either manually or
CFM - Connection Fault Management
DSAP - Domain Service Access Point: A member of a set of
SAPs at which a Maintenance Domain is capable of
offering connectivity to systems outside the Maintenance
IP SLA - Cisco IOS IP Service Level Agreements
IP SLA operation - Refers to the 'ethernetPing' or
'ethernetJitter' operation supported by IP SLA.
MEP - Maintenance association End Point: An actively managed
CFM entity, associated with a specific DSAP of a
service instance, which can generate and receive CFM
PDUs and track any responses.
maintenance domain - The network or the part of the network
for which faults in connectivity are to be managed.
The boundary of a Maintenance Domain is defined by a set
of DSAPs, each of which can become a point of connectivity
to a service instance.
Maintenance Domain Name - The identifier, unique over the
domain for which CFM is to protect against accidental
concatenation of service instances, of a particular
RTT - Round Trip Time
SAP - Service Access Point at which a service is offered.
service instance - A service instance is a set of SAPs,
selected from among the DSAPs defining a Maintenance
Domain, such that a Data.Request primitive presented
to one SAP can result in a Data.Indication primitive
occurring at one or more of the other SAPs in the set.
It corresponds to a VLAN or an Ethernet Virtual Connection.
TLV - Stands for Type, Length, Value, and denotes a method of
encoding variable-length and/or optional information in a
PDU. TLVs are not aligned to any particular word or octet
boundary. TLVs follow each other with no padding between
VLAN - Virtual Local Area Network: A subset of the active
topology of a Bridged Local Area Network. Associated
with each VLAN is a VLAN Identifier.
IEEE 802.1ag Draft 6.0 'Virtual Briged Local Area Networks
- Amendments 5: Connectivity Fault Management' July 2006