Loopback - Alcatel-Lucent 7750 SR OS Interface Configuration Manual

Configuration Commands
hold-time
Syntax hold-time hold-time {[up hold-time up] [down hold-time down]}
no hold-time
Context config>port>sonet-sdh
Description This command configures SONET link dampening timers in 100s of milliseconds. This guards
against reporting excessive interface transitions. This is implemented by not advertising subsequent
transitions of the interface to upper layer protocols until the configured timer has expired.
Default
no hold-time
Parameters up hold-time up — Configures the hold-timer for link up event dampening. A value of zero (0)
down hold-time down — The hold-timer for link down event dampening. A value of zero (0)

loopback

Syntax loopback {line | internal}
no loopback
Context config>port>sonet-sdh
Description This command activates a loopback on the SONET/SDH port.
The SONET port must be in a shut down state to activate any type of loopback. The loopback setting
is never saved to the generated/saved configuration file.
Note that loopback mode changes on a SONET/SDH port can affect traffic on the remaining ports.
Default
no loopback
Parameters line — Set the port into line loopback state.
internal — Set the port into internal loopback state.
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indicates that an up transition is reported immediately.
Values 0 — 100 in 100s of milliseconds
indicates that a down transition is reported immediately.
Values
0 — 100 in 100s of milliseconds
Note: For APS configurations, the hold-time down and up default values are 100 ms and 500
ms respectively. But, if there is a large communication delay (time to exchange K1/K2 bytes)
between the APS Controllers of the two endpoints of an APS link, it is highly suggested to
increase the default hold-time down timer on the APS group port accordingly with the
communication delay. See
7750 SR OS Interface Configuration Guide
aps on page 216.