Port Management
Loopback Detection Settings
166 Cisco 350, 350X and 550X Series Managed Switches, Firmware Release 2.4, ver 0.4
10
- UDLD—Select to enable automatic error recovery mechanism for the UDLD
shutdown state.
- Loopback Detection—Select to enable error recovery mechanism for ports shut
down by loopback detection.
- Storm Control—Select to enable error recovery mechanism for ports shut down by
storm control.
- Link Flap Prevention—Select to minimize the disruption to your network.
Enabled, this command automatically disables ports that experience link-flap
events.
STEP 3 Click Apply to update the global setting.
To manually reactivate a port:
STEP 1 Click Port Management > Error Recovery Settings.
The list of inactivated interfaces along with their Suspension Reason is displayed.
STEP 2 Select the interface to be reactivated.
STEP 3 Click Reactivate.
Loopback Detection Settings
Loopback Detection (LBD) provides protection against loops by transmitting loop protocol
packets out of ports on which loop protection has been enabled. When the switch sends out a
loop protocol packet, and then receives the same packet, it shuts down the port that received
the packet.
Loopback Detection operates independently of STP. After a loop is discovered, the port that
received the loops is placed in the Shut Down state. A trap is sent and the event is logged.
Network managers can define a Detection Interval that sets the time interval between LBD
packets.
The following loop cases can be detected by the Loopback Detection protocol:
• Shorted wire—Port that loop backs all receiving traffic.
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