R0106-HP MSR Router Series Layer 2 - LAN Switching Configuration Guide(V7)

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1. The router automatically shuts down the port.
2. The router automatically sets the port to the forwarding state after the detection timer configured by
using the shutdown-interval command expires. For more information about the shutdown-interval
command, see Fundamentals Command Reference.
3. The router shuts down the port again if a loop is still detected on the port when the detection timer
expires.
This process is repeated until the loop is removed.
NOTE:
Incorrect recovery can occur when loop detection frames are discarded to reduce the load. To avoid this,
use the shutdown action, or manually remove the loop.
Loop detection configuration task list
Tasks at a
g
lance
(Required.) Enabling loop detection
(Optional.) Configuring the loop protection action
(Optional.) Setting the loop detection interval
Enabling loop detection
You can enable loop detection globally or on a per-port basis. The global configuration applies to all
ports in the specified VLANs. The per-port configuration applies to the individual port only when the port
belongs to the specified VLANs. Per-port configurations take precedence over global configurations.
Enabling loop detection globally
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Globally enable loop
detection.
loopback-detection global enable
vlan { vlan-list | all }
Disabled by default.
Enabling loop detection on a port
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter Layer 2 Ethernet interface
view.
interface interface-type
interface-number
N/A
3. Enable loop detection on the
port.
loopback-detection enable vlan
{ vlan-list | all }
Disabled by default.