Allied Telesis AT-8100 Series - Manual (Page 828)

Chapter 56: Rapid Spanning Tree Protocol (RSTP) Procedures
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Edge ports that are disabled by the feature remain disabled until you
manually enable them again with the NO SHUTDOWN command. As an
alternative, you can activate the BPDU guard timer so that the switch
automatically reactivates disabled ports after the specified period of time.
This example activates the timer and sets it to 1000 seconds:
awplus> enable
awplus# configure terminal
awplus(config)# spanning-tree errdisable-timeout enable
awplus(config)# spanning-tree errdisable-timeout interval
1000
To disable BPDU guard on the switch, use the NO SPANNING-TREE
PORTFAST BPDU-GUARD command, shown in this example:
awplus> enable
awplus# configure terminal
awplus(config)# no spanning-tree portfast bpdu guard