Reference Guide

Parameters
seconds (OPTIONAL) For SONET interfaces with PPP encapsulation enabled,
enter the number of seconds between keepalive packets. The range
is 0 to 23767. The default is 10 seconds.
Defaults Enabled.
Command Modes INTERFACE
Command History
Version 8.3.11.1 Introduced on the Z9000.
Version 8.3.7.0 Introduced on the S4810.
Version 8.1.1.2 Introduced on the E-Series ExaScale.
Version 7.6.1.0 Introduced on the S-Series.
Version 7.5.1.0 Introduced on the C-Series.
pre-Version
6.1.1.0
Introduced on the E-Series.
Usage
Information
When you configure keepalive, the system sends a self-addressed packet out of the
configured interface to verify that the far end of a WAN link is up. When you configure no
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.
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