HP 3100 Series User Manual

10
Table 1 Actions to take upon detection of a loop condition
Port type
Actions
No protective action is configured A protective action is configured
Access port
• Place the receiving interface in controlled
mode. The interface does not receive or
send packets.
• Generate traps and log messages.
• Delete all MAC address entries of the
interface.
• Perform the configured protective
action.
• Generate traps and log
messages.
• Delete all MAC address entries of
the interface.
Hybrid or
trunk port
• Generate traps and log messages.
• If loopback detection control is enabled,
place the receiving interface in controlled
mode. The interface does not receive or
send packets.
• Delete all MAC address entries of the
interface.
• Generate 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.
Configuration restrictions and guidelines
• To use loopback detection on an Ethernet interface, you must enable the function both globally
and on the interface.
• When you enable multi-port loopback detection on a switch, both single-port and multi-port
loops can be detected.
• To disable loopback detection on all interfaces, run the undo loopback-detection enable
command in system view.
• To enable a hybrid or trunk port to take the administratively specified protective action, you must
use the loopback-detection control enable command on the port.
• When you change the link type of an Ethernet interface by using the port link-type command,
the switch removes the protective action configured on the interface. For more information
about the port link-type command, see Layer 2—LAN Switching Command Reference.
Configuration procedure
To configure loopback detection:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enable global
loopback detection.
loopback-detection enable
Disabled by default.
3. Enable multi-port
loopback detection.
loopback-detection
multi-port-mode enable
Optional.
By default, multi-port loopback detection is
disabled, and the device can only detect
single-port loopback.
4. Set the loopback
detection interval.
loopback-detection
interval-time
time
Optional.
30 seconds by default.

HP 3100 Series Specifications

General

Brand	HP
Model	3100 Series
Category	Switch
Language	English