Ethernet OAM Flashcards
The Ethernet OAM supports two sets of functions:
Connectivity fault Management - CFM; Performance Monitor - PM
The portion of a network typically owned and operated by a single entity
Maintenance domain (MD); MDs are configured with names and eight levels, ranging from 0 to 7. A hierarchical relationship based on these levels exists between domains.
The boundary points of a maintenance domain. They can initiate and terminate OAM frames. End-to-end tests are initiated and terminated by then.
Maintenance entity group end point (MEP)
They do not initiate OAM frames, but can respond to some OAM frames (loopback and link trace) to isolate faults.
Maintenance entity group intermediate point (MIP)
A set of MEPs established to verify the integrity of a single service instance.
Maintenance association (MA)
OAM Standards
IEEE 802.1ag focuses on the end-to-end connectivity and continuity of nodes in an Ethernet network. This is why it is referred to as connectivity fault management, or CFM
What are the 3 main functions of CFM - 802.1ag
Continuity check messages (CCM); Loopback messages and responses (LBM and LBR); Link trace messages and Responses (LTM and LTR)
A ________ is an OAM Protocol Data Unit (OAMPDU) that provides service monitoring from one end point to another (MEP to MEP).
CCM messages continuity check message; type ping between the CE; can be configured to be sent at one of seven standard intervals: 3.3ms, 10ms, 100ms, 1s, 10s, 1 min, and 10min; When the reception of CCM messages at a node is lost, this represents the loss of connectivity to that node
CCMs can be either multicast or unicast
True
LBMs and LBRs messages are used to determine path integrity.
Loopback messages and loopback responses; A loopback is similar to a layer 3 ping request/reply. In a loopback test, a MEP sends messages to another MEP or MIP to verify connectivity across a given MA
LTMs and LTRs are similar to traceroute, a MEP or MIP can respond
True, it is possible to isolate the fault in the MA
_____ measures the following performance parameters: frame loss, delay, delay variation and service availability. Its main features are alarm indication signals (ETH-AIS), remote defect indication (ETH-RDI), locked signal (ETH-LCK), test signal (ETH-Test), performance monitoring (ETH-PM), frame loss measurement (ETH-LM), frame delay measurement (ETH-DM) and client signal fail (ETH-CSF).
Y.1731
This standard is also referred to as Ethernet for the First Mile (EFM) OAM.
IEEE 802.3ah
802.3ah allows checks across multiple domains while 801.1ag allows one-hop checks
False, it is the inverse
The ____ uses the following mechanisms:
Discovery; Loopback; Polling of management information base (MIB) variables; remote failing indication and link monitoring
