Accton Technology ES3528M-SFP manual Spanning-tree loopback-detection release-mode, Syntax

4 Command Line Interface

9.3.4 (Note 1).

•Port Loopback Detection will not be active if Spanning Tree is disabled on the switch.

Example

Console(config)#interface ethernet 1/5

Console(config-if)#spanning-tree loopback-detection

spanning-tree loopback-detection release-mode

This command configures the release mode for a port that was placed in the discarding state because a loopback BPDU was received. Use the no form to restore the default.

Syntax

spanning-treeloopback-detection release-mode {auto manual} no spanning-treeloopback-detection release-mode

•auto - Allows a port to automatically be released from the discarding state when the loopback state ends.

•manual - The port can only be released from the discarding state manually.

Default Setting

Auto

Command Mode

Interface Configuration (Ethernet, Port Channel)

Command Usage

•If the port 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 port receives any other BPDU except for it’s own, or;

-The port’s link status changes to link down and then link up again, or;

-The port ceases to receive it’s own BPDUs in a forward delay interval.

•If Port Loopback Detection is not enabled and a port receives it’s own BPDU, then the port will drop the loopback BPDU according to IEEE Standard 802.1W-2001 9.3.4 (Note 1).

•Port Loopback Detection will not be active if Spanning Tree is disabled on the switch.

•When configured for manual release mode, then a link down / up event will not release the port from the discarding state.

Example

Console(config)#interface ethernet 1/5 Console(config-if)#spanning-tree loopback-detection release-mode manual

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