Configuring Link Change Suppression On An Ethernet Interface - HP 5820X series Configuration Manual

Configuring link change suppression on an Ethernet interface

An Ethernet interface has two physical link states: up and down. Each time the physical link of an
interface goes up or comes down, the physical layer reports the change to the upper layers, and the
upper layers handle the change, resulting in increased overhead.
To prevent physical link flapping from affecting system performance, configure link change suppression to
delay the reporting of physical link state changes. When the delay expires, the interface reports any
detected change.
Link change suppression does not suppress administrative up or down events. When you shut down or
bring up an interface with the shutdown or undo shutdown command, the interface reports the event to
the upper layers immediately.
On an HP 5800 or HP 5820X switch, you can configure link down suppression or link up suppression,
but not both.
Link down suppression enables an interface to suppress link down events and start a delay timer each
time the physical link goes down. During this delay, the interface does not report the link down event,
and the display interface brief or display interface command displays the interface state as UP. If the
physical link is still down when the timer expires, the interface reports the link down event to the upper
layers.
Link up suppression enables an interface to suppress link up events and start a delay timer each time the
physical link goes up. During this delay, the interface does not report the link up event, and the display
interface brief or display interface command displays the interface state as DOWN. If the physical link is
still up when the timer expires, the interface reports the link up event to the upper layers.
Configuring link down suppression
To enable an Ethernet interface to suppress link down events:
To do...
1. Enter system view
2. Enter Ethernet interface view
3. Set a link down suppression
interval
Configuring link up suppression
To configure link up suppression on an Ethernet interface:
To do...
1. Enter system view
2. Enter Ethernet interface view
3. Set a link up suppression
interval
The link-delay mode up command and the link-delay command supersedes each other, and whichever is
configured last takes effect.
Use the command...
system-view
interface interface-type
interface-number
link-delay delay-time
Use the command...
system-view
interface interface-type interface-
number
link-delay delay-time mode up
7
Remarks
—
—
Required.
Link down suppression is disabled
by default.
Remarks
—
—
Required.
Link up suppression is disabled by
default.