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HP A3100-8 v2 SI Configuration Manual: Enabling Loopback Detection On An Ethernet Interface

A3100 v2 switch series layer 2 - lan switching.
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To do...
Enter system view
Configure jumbo frame support

Enabling loopback detection on an Ethernet interface

Enabling single-port loopback detection on an Ethernet Interface
If an interface receives a packet that it sent, a loop occurs. Loops might 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. Depending on whether a protective action is configured, the device takes the actions
in
Table 1
to alleviate the impact of the loop condition.
Table 1 Actions to take upon detection of a loop condition
Port type
Access port
Hybrid or trunk
port
Follow these steps to configure single-port loopback detection:
To do...
Enter system view
Enable global loopback detection
Set the loopback detection interval
Enter Ethernet
interface view
Use the command...
system-view
jumboframe enable
Actions
No protective action is configured
Place the receiving interface in controlled
mode. The interface does not receive or send
packets.
Generate traps.
Delete all MAC address entries of the
interface.
Generate traps.
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.
Use the command...
system-view
loopback-detection enable
loopback-detection interval-time
time
Enter Ethernet
interface interface-type
interface view
interface-number
Remarks
Optional
By default, an Ethernet interface accepts
jumbo frames (up to 2048 bytes).
A protective action is configured
10
Perform the configured protective
action.
Generate 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.
Use either command.

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