Use this command to allow or disallow Topology Change Notification (TCN) propagation on the specified port(s).
| port-string | Specifies the port(s) on which to allow or disallow TCN propagation. For a detailed description of possible port-string values, refer to Port String Syntax Used in the CLI in the S-, K-, and 7100 Series Configuration Guide. |
| true | false | Specifies whether TCN propagation is allowed or not allowed on the specified port(s). Restricted TCN is set to false (not restricted) by default.
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None.
All command modes.
Setting this command to true prevents unnecessary address flushing in the core region of the network caused by activation of bridges external to the core. When set to true, temporary loss of connectivity can occur after changes in a Spanning Tree‘s active topology, due to persistent, incorrectly learned, station location information. A possible reason for not allowing TCN propagation is when bridges are not under the full control of the administrator or because MAC_Operational for the attached LANs transitions frequently.
TCN propagation is set to false by default: the port propagates received TCNs and topology changes to other ports.
This example shows how to allow TCN propagation on ports ge.2.1-3:
System(rw)->set spantree restrictedtcn ge.2.1-3 true
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