H3C S6850 Series Configuration Guide

20
Configuring physical state change suppression on an
aggregate interface
About physical state change suppression
The physical link state of an aggregate interface is either up or down. Each time the physical link of
an interface comes up or goes down, the system immediately reports the change to the CPU. The
CPU then performs the following operations:
• Notifies the upper-layer protocol modules (such as routing and forwarding modules) of the
change for guiding packet forwarding.
• Automatically generates traps and logs to inform users to take the correct actions.
To prevent frequent physical link flapping from affecting system performance, configure physical
state change suppression. You can configure this feature to suppress link-down events, link-up
events, or both. If an event of the specified type still exists when the suppression interval expires, the
system reports the event to the CPU.
Restrictions and guidelines
On an interface, you can configure different suppression intervals for link-up and link-down events. If
you execute the
link-delay command multiple times for an event type, the most recent
configuration takes effect on that event type.
Use this feature on an aggregate interface to reduce the impact of interface flapping on upper-layer
services, for example, on a DRNI IPP. For more information about IPPs, see Layer 2—LAN
Switching Configuration Guide.
Procedure
1. Enter system view.
system-view
2. Enter aggregate interface view.
{ Enter Layer 2 aggregate interface view.
interface bridge-aggregation interface-number
{ Enter Layer 3 aggregate interface view.
interface route-aggregation interface-number
3. Configure physical state change suppression.
link-delay { down | up } [ msec ] delay-time
By default, each time the physical link of an aggregate interface goes up or comes down, the
system immediately reports the change to the CPU.
Shutting down an aggregate interface
Restrictions and guidelines
Shutting down or bringing up an aggregate interface affects the aggregation states and link states of
member ports in the corresponding aggregation group as follows:
• When an aggregate interface is shut down, all its Selected ports become Unselected and all
member ports go down.
• When an aggregate interface is brought up, the aggregation states of all its member ports are
recalculated.
When you shut down or bring up a Layer 3 aggregate interface, all its aggregate subinterfaces are
also shut down or brought up. Shutting down or bringing up a Layer 3 aggregate subinterface does
not affect the state of the main aggregate interface.

H3C S6850 Series Specifications

General

Brand	H3C
Model	S6850 Series
Category	Switch
Language	English