Juniper JUNOSE 11.1.X - LINK LAYER CONFIGURATION 4-7-2010 Configuration Manual page 276

JUNOSe 11.1.x Link Layer Configuration Guide
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Configuring 802.3ah OAM Link-Fault Management
host1(config-if)#ethernet oam lfm pdu-lost-threshold 4
In this example, the local interface is set to wait for 4 OAM PDUs to be missed
from the remote peer before it generates a link-fault event. You can configure
the local interface to wait for a larger number of OAM PDUs to be missed from
the remote peer in networks that are prone to high losses and fluctuating
performances, such as jitter, higher latency, and poor transmission of packets.
The number of OAM PDUs that can fail to be received from a remote peer before
the local OAM entity triggers a link-fault event can be in the range 3–10; the
default period is 5 PDUs.
Configure the interface to detect local link faults and send events to the remote
OAM entity when problems are noticed on the link. When link monitoring is
enabled, the interface sends event OAM protocol data units (PDUs) when errors
occur and interprets event OAM PDUs from the remote peer. Link monitoring
can be effective only if both the local client and remote peer agree to support it.
You can specify the event threshold values on an interface for the local errors
that occur or a period of time during which such local errors are detected. The
following are the error events that you can track using the OAM functionality:
Error frame events
Symbol error events
Error frame second events
a. Configure a low threshold value for sending frame error events, which when
exceeded causes an Errored Frame Event TLV to be sent to the remote OAM
entity. The Errored Frame Event TLV counts the number of errored frames
detected during the specified period.
host1(config-if)#ethernet oam lfm link-monitor frame-seconds threshold high
600
In this case, a low error frame threshold of 600 frames is set. When this
threshold is exceeded, an Errored Frame Event TLV is sent to the remote
peer.
b. Configure a high threshold value for frame errors, which when exceeded
triggers an action.
host1(config-if)#ethernet oam lfm link-monitor frame-seconds threshold high
60
In this case, a high error frame threshold of 60 frames is set. When this
threshold is exceeded, the action configured on the interface using the
ethernet oam lfm high-threshold action command is taken.
c. Configure a period of time during which error frames are counted for both
high and low threshold settings. The time duration is specified in hundred
millisecond units.
host1(config-if)#ethernet oam lfm link-monitor frame-seconds window 10
In this case, the window during which error frames are counted is set as 10
hundred millisecond units. The configured window is valid for both high and