Configuration Guide (Supporting R2.2.0.0) Owner's manual

Brocade 6910 Ethernet Access Switch Configuration Guide 345
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18
Spanning Tree Commands
duration - The duration to shut down the interface.
(Range: 60-86400 seconds)
Default Setting
block
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
• If an interface is shut down by this command, and the release mode is set to “auto” with the
spanning-tree loopback-detection release-mode command, the selected interface will be
automatically enabled when the shutdown interval has expired.
• If an interface is shut down by this command, and the release mode is set to “manual,” the
interface can be re-enabled using the spanning-tree loopback-detection release command.
Example
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree loopback-detection action shutdown 600
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.