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Chapter 7
| Spanning Tree Algorithm
Configuring Loopback Detection
Configuring Loopback Detection
Use the Spanning Tree > Loopback Detection page to configure loopback
detection on an interface. When loopback detection is enabled and a port or trunk
receives it's own BPDU, the detection agent drops the loopback BPDU, sends an
SNMP trap, and places the interface in discarding mode. This loopback state can be
released manually or automatically. If the interface is configured for automatic
loopback release, then the port will only be returned to the forwarding state if one
of the following conditions is satisfied:
◆
The interface receives any other BPDU except for it's own, or;
◆
The interfaces's link status changes to link down and then link up again, or;
◆
The interface ceases to receive it's own BPDUs in a forward delay interval.
Note:
If loopback detection is not enabled and an interface receives it's own BPDU,
then the interface will drop the loopback BPDU according to IEEE Standard 802.1w-
2001 9.3.4 (Note 1).
Note:
Loopback detection will not be active if Spanning Tree is disabled on the
switch.
Note:
When configured for manual release mode, then a link down/up event will
not release the port from the discarding state.
Parameters
These parameters are displayed:
◆
Interface – Displays a list of ports or trunks.
◆
Status – Enables loopback detection on this interface. (Default: Enabled)
◆
Trap – Enables SNMP trap notification for loopback events on this interface.
(Default: Disabled)
◆
Release Mode – Configures the interface for automatic or manual loopback
release. (Default: Auto)
◆
Release – Allows an interface to be manually released from discard mode. This
is only available if the interface is configured for manual release mode.
◆
Action – Sets the response for loopback detection to block user traffic or shut
down the interface. (Default: Block)
◆
Shutdown Interval – The duration to shut down the interface. (Range: 60-
86400 seconds; Default: 60 seconds)
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