Juniper JUNOSE 10.0.X PHYSICAL LAYER, Configuration Manual

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In networks where a link alternates between the up and down state for brief
periods, we recommend that you set a longer debounce interval to prevent
the router from prematurely and unnecessarily tearing down and rebuilding
the PPPoE connections during brief network outages.
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In networks where the interface changes to a down state and remains in the
down state for long periods of time, we recommend that you set a shorter
debounce interval to minimize the latency (delay) required for the interface
to notify the upper-layer protocols of the state change. When you set a longer
debounce interval, the latency increases.
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We recommend that you disable the debounce feature in networks that
require faster link status notifications to upper links.
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The debounce feature is not supported for Ethernet interfaces on which
either IEEE 802.3ad link aggregation is configured.
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The setting of the debounce command persists after you reboot the router.
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Example
host1(config-if)# debounce 3
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Use the no version to restore the default behavior, which disables debounce on
the interface.
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See debounce.
debounce-interval
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Use to modify the minimum time an Ethernet interface must maintain a given
state—for example, up or down—before the interface notifies the upper-layer
protocols of the state change. The interval can be in the range 1–5 seconds.
NOTE: Debounce configuration is supported for all Ethernet module combinations
on E-series routers.
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You can configure this command only if you have enabled the debounce timer
feature using the
debounce command. After you enable this feature, you can
use the debounce-interval command to modify the debounce interval.
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The setting of the debounce-interval command persists after you reboot the
router.
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Example
host1(config-if)# debounce—interval 4
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Use the no version to restore the default value, 1 second.
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See debounce-interval.
duplex
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Configuring the Physical Interface
JUNOSe 10.0.x Physical Layer Configuration Guide