Cisco 500 Series - Configuring Loopback Detection

Port Management
Loopback Detection
185 Cisco 500 Series Stackable Managed Switch Administration Guide
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• Generates an appropriate SYLOG message.
Configuring Loopback Detection
Default Settings and Configuration
Loopback detection is not enabled by default.
Interactions with Other Features
If STP is enabled on a port on which Loopback Detection is enabled, the port must
be in STP forwarding state.
Configuring LBD Workflow
To enable and configure LBD:
STEP 1 Enable Loopback Detection system-wide in the Loopback Detection Settings
page.
STEP 2 Enable Loopback Detection on access ports in the Loopback Detection Settings
page.
STEP 3 Enable Auto-Recovery for Loopback Detection in the Error Recovery Settings
page.
To configure Loopback Detection:
STEP 1 Click Port Management > Loopback Detection Settings.
STEP 2 Select Enable in the Loopback Detection global field to enable the feature.
STEP 3 Enter the Detection Interval. This is the interval between transmission of LBD
packets.
STEP 4 Click Apply to save the configuration to the Running Configuration file.
The following fields are displayed for each interface, regarding the Loopback
Detection State:
• Administrative—Loopback detection is enabled.
• Operational—Loopback detection is enabled but not active on the
interface.