R0106-HP MSR Router Series Layer 2 - LAN Switching Command Reference(V7)

Loop detection commands

display loopback-detection

Use display loopback-detection to display the loop detection configuration and status.

Syntax

display loopback-detection

Views

Any view

Predefined user roles

network-admin

network-operator

Example

# Display the loop detection configuration and status.

<Sysname> display loopback-detection

Loopback detection is enabled.

Loopback detection interval is 30 second(s).

Loopback is detected on following interfaces:

Interface Action mode

GigabitEthernet2/1/1 Block

GigabitEthernet2/1/2 Shutdown

GigabitEthernet2/1/3 None

GigabitEthernet2/1/4 No-learning

Table 20 Command output

Field Description

Action mode

Loop protection action:

• Block—When a loop is detected on a port, the device performs the following

tasks:

{ Generates a log.

{ Disables the port from learning MAC addresses.

{ Blocks inbound traffic on the port.

• None—When a loop is detected on a port, the device generates a log but

performs no action on the port.

• No-learning—When a loop is detected on a port, the device generates a log

and disables the port from learning MAC addresses.

• Shutdown—When a loop is detected on a port, the device generates a log and

shuts down the port to disable it from receiving and sending any frames. The

device automatically sets the port to the forwarding state after a time interval.

Configure the time interval by using the shutdown-interval command (see

Fundamentals Command Reference).