Cisco 350XG series Administration Manual page 175

Port Management
Loopback Detection Settings
STEP 1
STEP 2
STEP 3
Cisco 350XG & 550XG Series 10G Stackable Managed Switches
• 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:
Enable Loopback Detection system-wide in the Loopback Detection Settings
page (below).
Enable Loopback Detection on access ports in the Loopback Detection Settings
page (below).
Enable Auto-Recovery for Loopback Detection in the
page.
10
Error Recovery Settings
166