configure stpd ports restricted-tcn

configure stpd stpd_name ports restricted-tcn [on | off] port_list


Restricts the propagation of Topology Change Notification (TCN) BPDUs on the specified port.

Syntax Description

stpd_name Specifies an STPD name on the switch.
on Does not propagate received TCN BPDUs and topology changes to other ports.
off Allows the propagation of received TCN BPDUs and topology changes to other ports.
port_list Specifies one or more ports or slots and ports.


The default value is off.

Usage Guidelines

Set restricted-tcn to on to prevent unnecessary address flushing caused by persistent TCNs. Restricting TCNs is a useful when it is not possible to remove the source of the TCNs.


The following example disables the propagation of TCNs in port 1:10 for STP domain r1:

configure stpd r1 ports restricted-tcn on 1:10


This command was first available in ExtremeXOS 15.7.1.

Platform Availability

This command is available on ExtremeSwitching X435, X440-G2, X450-G2, X460-G2, X465, X590, X620, X670-G2, X690, X695, X870, 5320, 5420, and 5520 series switches.