Oam Events - Alcatel-Lucent 7750 Configuration Manual

OAM Events

The Information OAMPDU is transmitted by each peer at the configured intervals. This
OAMPDU performs keepalive and critical notification functions. Various local conditions are
conveyed through the setting of the Flags field. The following Critical Link Event defined in IEEE
802.3 Section 57.2.10.1 are supported;
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The local node can set an unset the various Flag fields based on the operational state of the port,
shutdown or activation of the efm-oam protocol or locally raised events. These Flag fields
maintain the setting for the continuance of a particular event. Changing port conditions, protocol
state or operator intervention may impact the setting of these fields in the Information OAMPDU.
A peer processing the Information OAMPDU can take a configured action when one or more of
these Flag fields are set. By default, receiving a set value for any of the Flag fields will cause the
local port to enter the previous mentioned Link Up port state and an event will be logged. If this
default behavior is not desired, the operator may choose to log the event without affecting the
local port. This is configurable per Flag field using the options under config>port>ethernet>efm-
oam>peer-rdi-rx.
Link Monitoring
The efm-oam protocol provides the ability to monitor the link for error conditions that may
indicate the link is starting to degrade or has reached an error rate that exceeds acceptable
threshold.
Link monitoring can be enabled for three types of frame errors; errored-frame, errored-frame-
period and errored-frame-seconds. The errored-frame monitor is the number of frame errors
compared to the threshold over a window of time. The errored-frame-period monitor is the
number of frame errors compared to the threshold over a window of number of received packets.
This window is checked once per second to see if the window parameter has been reached. The
errored-frame-seconds monitor is the number of errored seconds compared to the threshold over
a window of time. An errored second is any second with a single frame error.
An errored frame is counted when any frame is in error as determined by the Ethernet physical
layer, including jabbers, fragments, FCS or CRC and runts. This excludes jumbo frames with a
byte count higher than 9212, or any frame that is dropped by the phy layer prior to reaching the
monitoring function.
7750 SR Interface Configuration Guide
Link Fault: The PHY has determined a fault has occurred in the receive direction of the
local DTE
Dying Gasp: An unrecoverable local failure condition has occurred
Critical Event: An unspecified critical event has occurred
Interface Configuration
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