Juniper JUNOSE 11.2.X MULTICAST ROUTING, 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
191 Copyright © 2010, Juniper Networks, Inc.
Chapter 5: Configuring Ethernet Interfaces