Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) - Manual (Page 545)

Spanning Tree Commands
Software Reference for x310 Series Switches
C613-50046-01 REV A AlliedWare Plus TM Operating System - Version 5.4.4C 19.55
spanning-tree mst instance restricted-tcn
Use this command in Interface Configuration mode for a switch port interface only to set
the restricted TCN (Topology Change Notification) value to TRUE for the specified MSTI
(Multiple Spanning Tree Instance).
Use the no variant of this command in Interface Configuration mode to reset the restricted
TCN for the specified MSTI to the default value of FALSE.
Syntax spanning-tree mst instance <instance-id> restricted-tcn
no spanning-tree mst instance <instance-id> restricted-tcn
Default The default value for restricted TCNs is FALSE, as reset with the no variant of this
command.
Mode Interface Configuration mode for a switch port interface only.
Usage A Topology Change Notification (TCN) is a simple Bridge Protocol Data Unit (BPDU) that a
bridge sends out to its root port to signal a topology change. You can configure restricted
TCN between TRUE and FALSE values with this command and the no variant of this
command.
If you configure restricted TCN to TRUE with this command then this stops the switch port
from propagating received topology change notifications and topology changes to other
switch ports.
If you configure restricted TCN to FALSE with the no variant of this command then this
enables the switch port to propagate received topology change notifications and
topology changes to other switch ports.
Examples
Related Commands instance vlan (MSTP)
spanning-tree priority (port priority)
spanning-tree mst instance
spanning-tree mst instance path-cost
spanning-tree mst instance restricted-role
Parameter Description
<instance-id> <1-15> Specify the MST instance ID. The MST instance must have
already been created using the
instance vlan (MSTP) command.
awplus# configure terminal
awplus(config)# interface port1.0.2
awplus(config-if)# spanning-tree mst instance 3 restricted-tcn
awplus# configure terminal
awplus(config)# interface port1.0.2
awplus(config-if)# no spanning-tree mst instance 3
restricted-tcn