Brocade 6910 Ethernet Access Switch Configuration Guide (Supporting R2.2.0.0) - Manual (Page 400)

344 Brocade 6910 Ethernet Access Switch Configuration Guide
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Spanning Tree Commands
Command Usage
• Specify a point-to-point link if the interface can only be connected to exactly one other bridge,
or a shared link if it can be connected to two or more bridges.
• When automatic detection is selected, the switch derives the link type from the duplex mode. A
full-duplex interface is considered a point-to-point link, while a half-duplex interface is
assumed to be on a shared link.
• RSTP only works on point-to-point links between two bridges. If you designate a port as a
shared link, RSTP is forbidden. Since MSTP is an extension of RSTP, this same restriction
applies.
Example
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree link-type point-to-point
spanning-tree loopback-detection
This command enables the detection and response to Spanning Tree loopback BPDU packets on
the port. Use the no form to disable this feature.
Syntax
[no] spanning-tree loopback-detection
Default Setting
Enabled
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
• 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.
Example
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree loopback-detection
spanning-tree loopback-detection action
This command configures the response for loopback detection to block user traffic or shut down
the interface. Use the no form to restore the default.
Syntax
spanning-tree loopback-detection action
{block | shutdown duration}
no spanning-tree loopback-detection action
block - Blocks user traffic.
shutdown - Shuts down the interface.