Juniper JUNOSE SOFTWARE 11.2.X - LINK LAYER CONFIGURATION GUIDE 7-7-2010 Configuration Manual page 271

Copyright © 2010, Juniper Networks, Inc.
customer edge (CE) devices are normally configured for passive mode operation,
whereas the provider edge (PE) equipment is configured for active mode operation.
Specify the frequency, in milliseconds, at which OAM PDUs are sent to the peer to
3.
keep the OAM association alive.
host1(config-if)#ethernet oam lfm pdu-transmit-interval 200
In this example, the local interface is configured to send Information OAM PDUs
every 200 milliseconds to the remote peer. This OAM PDU includes local, remote,
and organization-specific information, and contains a local-information TLV.
The rate of transmission of OAM PDUs can be a number in the range 100–1000
milliseconds; the default value is 1000 milliseconds.
Specify the number of OAM PDUs that a local OAM client can fail to receive from a
4.
remote peer before a link-fault event is triggered. The product of the PDU timer and
the PDU loss threshold equals the lost-link timer value, which is used to reset the
Discovery state diagram that maintains the states of the OAM entities and determines
the condition of the link based on various stored values.
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
5.
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
Chapter 7: Configuring IEEE 802.3ah OAM Link-Fault Management
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