HP 5820X Series

15
Table 3 Actions to take upon detection of a loop condition
Actions
Port type
No protective action is configured A protective action is configured
Access interface
• 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.
• Perform the configured protective
action.
• Create traps and log messages.
• Delete all MAC address entries of the
interface.
Hybrid or trunk
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.
• 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.
To configure single-port loopback detection:
To do… Use the command… Remarks
1. Enter system view
system-view —
2. Enable global loopback
detection
loopback-detection enable
Required.
Disabled by default.
3. Set the loopback detection
interval
loopback-detection interval-time
time
Optional.
30 seconds by default.
Enter Ethernet
interface view
interface interface-type interface-
number
4. Enter
Ethernet
interface
view or
port group
view
Enter port
group view
port-group manual port-group-
name
Use either command.
To configure loopback detection
on one interface, enter Ethernet
interface view.
To configure loopback detection
on a group of Ethernet interfaces,
enter port group view.
5. Enable loopback detection on
the interface
loopback-detection enable
Required.
Disabled by default.
6. Enable loopback detection
control
loopback-detection control enable
Optional.
Disabled by default.
This command is available only
on hybrid and trunk interfaces.
7. Enable loopback detection in
all VLANs on the trunk or
hybrid interface
loopback-detection per-vlan
enable
Optional.
By default, a trunk or hybrid
interface performs loopback
detection only in its default VLAN.