This topic describes the guidelines to follow when you configure Ethernet Link OAM, including the preferred use of Ethernet OAM profiles, how interface-level settings override profile settings, and the accepted values for link-monitor window sizes.
Use an Ethernet OAM profile for multiple interfaces
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Create an Ethernet OAM profile in Ethernet configuration mode and attach it to each interface that requires the same settings, instead of configuring Ethernet OAM features directly on each interface.
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An Ethernet OAM profile and its features can be referenced by other interfaces, which lets those interfaces inherit the settings from the profile. This method simplifies the configuration of EOAM features across multiple interfaces.
Interface configuration overrides profile settings
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When an interface is attached to an Ethernet OAM profile and one or more Ethernet OAM features are also configured directly on that interface, the interface-level configuration takes effect and overrides the profile settings for those features.
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This principle applies when an interface uses an Ethernet OAM profile and also has one or more Ethernet OAM features configured directly on it.
Configure link-monitor window sizes as multiples of the polling interval
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The IEEE 802.3 standard defines the window size as a number of symbols rather than a time duration. These two formats can be converted either way by using a knowledge of the interface speed and encoding.
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The default value is 1000.
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If specified in milliseconds, the range is 1000 to 60000.
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If not specified as a multiple of 1 second, the actual window used is rounded up to the nearest second, with thresholds scaled accordingly.
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If specified in symbols, the range is interface speed dependent (must be between the maximum number of symbols that could be received in 1 second and the maximum number of symbols that could be received in 1 minute).
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Again the actual window used is rounded up to the nearest second, with thresholds scaled accordingly.
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The default value is 1000 milliseconds.
Guidelines for
symbol-period threshold { ppm[ low threshold ] [ high threshold ] | symbols [ low threshold [ thousand | million | billion ]] [ high threshold [ thousand | million | billion ]]} command
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At least one of the high and low thresholds must be specified.
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If the low threshold is not specified, the default value is used.
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If the high threshold is not specified, no action is performed in response to an event.
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The high threshold must not be smaller than the low threshold.
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If specified in ppm, the range (for both thresholds) is 1 to 1000000. If specified in symbols, the range (for both thresholds) is 1 to the maximum window size in symbols, see symbol-period window.
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The default low threshold is 1 symbol.
Guidelines for
frame-period window { milliseconds window | frames window [ thousand | million | billion ]} command
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The range is from 100 to 60000, if defined in milliseconds.
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If the window is defined as say, 200ms, and the interface could receive at most say 10000 minimum size frames in 200ms, then the actual window size used will be the time taken to receive 10000 frames, rounded up to the nearest second. The thresholds will be scaled accordingly.
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If specified in frames, the range is interface speed dependent, but must be between the number of minimum size frames that could be received in 100ms and the number of minimum size frames that could be received in 1 minute.
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If the window is defined as 20000 frames, the actual window size used will be the time taken to receive 20000 frames, rounded up to the nearest second. The thresholds will be scaled accordingly.
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The default value is 1000 milliseconds.
Guidelines for
frame-period threshold { ppm [ low threshold ] [ high threshold ] | frames [ low threshold [ thousand | million | billion ]] [ high threshold [ thousand | million | billion ]]} command
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When using this command at least one of the high and low thresholds must be specified.
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If the low threshold is not specified, the default value is used.
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If the high threshold is not specified, no action is performed in response to an event.
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The high threshold must not be smaller than the low threshold.
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The range for both thresholds is from 1 to 1000000 if specified in ppm. If specified in frames, the range is from 1 to the maximum frame-period window size in frames, see frame-period window.
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The default low threshold is 1 ppm.
Guidelines for
frame-seconds threshold [ low threshold ] [ high threshold ] command
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When using this command at least one of the high and low thresholds must be specified.
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If the low threshold is not specified, the default value is used.
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If the high threshold is not specified, no action is performed in response to an event.
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The high threshold must not be smaller than the low threshold.
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The range is 1 to 900
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The default value is 1.