Configuration Commands
Page 254
7750 SR OS Interface Configuration Guide
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
0 — 100 in 100s of milliseconds
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
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
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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