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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) indicates
that an up transition is reported immediately.
Values
down hold-time down — The hold-timer for link down event dampening. A value of zero (0) indicates that
a down transition is reported immediately.
Values
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
page
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.
7710 SR OS Interface Configuration Guide
0 — 100 in 100s of milliseconds
0 — 100 in 100s of milliseconds
217.
Interface Configuration
aps
on
Page 261
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