Reference Guide

Interfaces | 581
keepalive
c e s
On SONET interfaces, send keepalive packets periodically to keep an interface alive when it is not
transmitting data.
Syntax
keepalive [seconds]
To stop sending SONET keepalive packets, enter no keepalive.
Parameters
Defaults
Enabled
Command Modes
INTERFACE
Command
History
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)
e
Enable Link Fault Signaling (LFS) on EtherScale 10 Gigabit Ethernet interfaces only.
Syntax
lfs enable
To disable LFS, enter no lfs enable.
Defaults
Enabled.
Command Modes
INTERFACE (10 Gigabit Ethernet interfaces only)
Command
History
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.
seconds
(OPTIONAL) For SONET interfaces with PPP encapsulation enabled, enter the number of
seconds between keepalive packets.
Range: 0 to 23767
Default: 10 seconds
Version 8.1.1.2 Introduced on E-Series ExaScale
Version 7.6.1.0 Introduced on S-Series
Version 7.5.1.0 Introduced on C-Series
pre-Version 6.2.1.0 Introduced for E-Series
pre-Version 6.1.1.0 Introduced for E-Series
Note: On TeraScale line cards, LFS is always enabled by default.