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

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Failover—On GE-2 and GE-HDE line modules that are paired with GE-2 SFP I/O
modules with physical link redundancy, this action attempts to transition the
link from active to redundant.
By default, no action is performed on the link. The operational status displayed in
the output of the
show commands for interfaces is down if the OAM session is marked
as down/nonfunctional after the configured action is taken on the link.
Related Topics
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OAM Feature Overview on page 234
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Guidelines for Configuring 802.3ah OAM Link-Fault Management on page 242
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OAM Messages on page 230
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Monitoring OAM Link-Fault Management Configuration for an Interface on
page 255
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Monitoring OAM Link-Fault Management Statistics for an Interface on page 253
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ethernet oam lfm high-threshold
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ethernet oam lfm link-monitor frame-seconds
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ethernet oam lfm link-monitor frame-seconds-summary
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ethernet oam lfm link-monitor symbol-period
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show ethernet oam lfm status
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show ethernet oam lfm statistics
OAM Remote Fault Detection Feature
Failures in Ethernet connectivity that are caused by slowly degrading quality are
difficult to notice. JUNOSe Software enables you to configure the OAM application
to monitor the receive path of the link for quality and generate Event Notification
PDUs to the remote peer. The following failure conditions can be communicated by
the remote entity to its peer using the Flags field of an Information OAM PDU (Figure
30 on page 230):
Link Fault
This event type signifies that a loss of signal is detected by the receiver; for example,
the peer's laser is not operating correctly. A link fault is sent once per second in the
Information OAM PDU. Link fault is applicable only when the physical sublayer is
capable of independent transmit and receive operations. If you configure this option,
the local OAM entity detects loss-of-signal conditions that occurred in the receive
path of the link. The local entity influences the state of the link based on an
Information OAM PDU with the Link Fault bit set in the Flags field that it receives
from the remote peer.
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OAM Remote Fault Detection Feature
JUNOSe 11.1.x Link Layer Configuration Guide