Port Management
Loopback Detection Settings
147 Cisco Sx350, SG350X, SG350XG, Sx550X & SG550XG Series Managed Switches, Firmware Release 2.2.5.x
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• Port operational status is up.
• Port is in STP forwarding/disable state (MSTP instance forwarding state, instance 0).
LBD frames are transmitted on the highest priority queue on LBD active ports (in case of
LAGs, the LBD is transmitted on every active port member in LAG).
When a loop is detected, the switch performs the following actions:
• Sets the receiving ports or LAGs to Error Disable state.
• Issues an appropriate SNMP trap.
• Generates an appropriate SYLOG message.
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
To enable and configure LBD:
STEP 1 Enable Loopback Detection system-wide in the Loopback Detection Settings page (below).
STEP 2 Enable Loopback Detection on access ports in the Loopback Detection Settings page (below).
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.
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