Enabling Single-Port Loopback Detection On An Ethernet Interface - H3C S5500-EI Series Configuration Manual

NOTE:
For network stability, use the default or set a higher traffic polling interval.
•
Storm control uses a complete polling cycle to collect traffic data, and analyzes the data in the next cycle.
•
It takes an interface at least one polling interval and at most two polling interval to take a storm control
action.
Enabling single-port loopback detection on an Ethernet
interface
If an interface receives a packet that it sent out, a loop occurs. Loops may cause broadcast storms,
degrading network performance. You can use loopback detection to detect loops on an interface and
configure the protective action to take on the interface when a loop is detected, for example, to shut
down the interface. In addition to the configured protective action, the switch also performs other actions
to alleviate the impact of the loop condition, as described in
Table 1 Actions to take upon detection of a loop condition
Port type
Access interface
Hybrid or trunk
interface
Follow these steps to configure single-port loopback detection:
To do...
Enter system view
Enable global loopback detection
Set the loopback detection interval
Actions
No protective action is configured
•
Put the interface in controlled mode.
The interface discards all incoming
packets, but still forwards outgoing
traffic.
•
Create traps.
•
Delete all MAC address entries of the
interface.
•
Create traps.
•
If loopback detection control is
enabled, set the interface in
controlled mode. The interface
discards all incoming packets, but
still forwards outgoing packets.
•
Delete all MAC address entries of the
interface.
Use the command...
system-view
loopback-detection enable
loopback-detection interval-time
time
13
1.
Table
A protective action is configured
•
Perform the configured protective
action.
•
Create traps and log messages.
•
Delete all MAC address entries of the
interface.
•
Create traps and log messages.
•
If loopback detection control is
enabled, take the configured protective
action on the interface.
•
Delete all MAC address entries of the
interface.
Remarks
—
Required
Disabled by default.
Optional
30 seconds by default.