Supported Error Events For Tracking Link Faults; Actions Performed On Exceeding Threshold Values - Juniper JUNOSE SOFTWARE 11.2.X - LINK LAYER CONFIGURATION GUIDE 7-7-2010 Configuration Manual

Supported Error Events for Tracking Link Faults

Actions Performed on Exceeding Threshold Values

Related Topics
Copyright © 2010, Juniper Networks, Inc.
When the number of errors observed during the window equals or goes below the
configured low threshold value, the OAM application attempts to reverse the operational
state of the link to up.
The OAM application maintains an updated cumulative count of frame and symbol errors
and also an updated summation of events generated as a result of a threshold exception.
Both these sums are displayed in the appropriate link event TLVs and in the output of
the show ethernet oam commands.
Because certain MAC devices on the IOAs might not support a symbol error statistic,
enabling the monitoring of symbol errors is benign and no events are raised for that link.
The following error events are supported for configuration on Ethernet interfaces:
Error Symbol Period (error symbols per second)—The number of symbol errors that
occurred during a specified period exceeded a threshold. These errors are coding symbol
errors.
Error Frame (error frames per second)—The number of frame errors observed during
a specified period exceeded a threshold.
Error Frame Seconds Summary (error seconds per n seconds)—The number of error
seconds (1-second intervals with at least one frame error) within the last n seconds
has exceeded a threshold.
Because IEEE 802.3ah OAM does not provide a guaranteed delivery of any OAM PDU,
the event notification OAM PDU might be sent multiple times to reduce the probability
of a lost notification. A sequence number is used to distinguish among duplicate events.
You can configure the OAM application to influence the operational state of the link,
when a link quality threshold is exceeded or a critical event PDU is received from the peer,
or both. You can configure either of the following actions to be taken when a high threshold
value is exceeded or when a failure condition is communicated by the remote peer:
Disable—OAM unconditionally attempts to influence the operational state of the
interface to down. If the interface is a member link of a LAG bundle and at least one
other viable link (redundant member or another active/up link) is present, OAM
attempts to influence the operational state of the link to down. Otherwise, no action
is taken.
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.
OAM Feature Overview on page 230
Chapter 7: Configuring IEEE 802.3ah OAM Link-Fault Management
233