keepalive, the system does not send keepalive packets and so the local end of a WAN link 
remains up even if the remote end is down.
lfs enable (EtherScale)
Enable link fault signaling (LFS) on EtherScale 10 Gigabit Ethernet interfaces only.
E-Series
Syntax
lfs enable
To disable LFS, use the no lfs enable command.
Defaults Enabled
Command Mode INTERFACE (10 Gigabit Ethernet interfaces only)
Command History
pre-Version 
6.1.1.0
Introduced for E-Series.
Usage 
Information
If there is a failure on the link, FTOS brings down the interface. The interface will stay down 
until the link failure signal stops.
NOTE: On TeraScale line cards, LFS is always enabled by default.
link debounce-timer
Assign the debounce time for link change notification on this interface.
E-Series
Syntax
link debounce [milliseconds]
Parameters
milliseconds
Enter the time to delay link status change notification on this 
interface. The range is 100 to 5000 ms. The default for copper is 3100 
ms. The default is for fiber is 100 ms.
Command Modes INTERFACE
Command History
Version 8.2.1.0 Introduced on the E-Series ExaScale.
Version 7.6.1.0 Introduced on the E-Series.
Usage 
Information
Changes do not affect any ongoing debounces. The timer changes take affect from the next 
debounce onward.
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