User guide

350 Brocade 6910 Ethernet Access Switch Configuration Guide
53-1002581-01
Spanning Tree Commands
18
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-tree loopback-detection release-mode {auto | manual}
no spanning-tree loopback-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. It can only be released using the spanning-tree
loopback-detection release command.
Example
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree loopback-detection release-mode manual
Console(config-if)#
spanning-tree loopback-detection trap
This command enables SNMP trap notification for Spanning Tree loopback BPDU detections. Use
the no form to restore the default.
Syntax
[no] spanning-tree loopback-detection trap
Default Setting
Disabled