An interface that connects to a host/server doesn’t change the STP topology so there’s no reason to generate TCNs when these interfaces go down. It’s possible that you never encountered the downside of not enabling portfast but an example like the problem with the backup server is …

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Dec 27, 2016 · It’s a good practice to disable TCN generation for interfaces that are connected to hosts. An interface that connects to a host/server doesn’t change the STP topology so there’s no reason to generate TCNs when these interfaces go down.

Spanning Tree Protocol (STP) topology changes affect all the switches in Layer 2 topology. When a switch detects a link change, it will send a Topology Change Notification (TCN) Bridge Protocol Data Unit (BPDU) out of its root port (RP) intended for the root switch.

Enables the TCN (Topology Change Notification) guard in the interface. When enabled for a port, the port stops propagating received topology change notifications and topology changes to other ports. The no form of the command sets the TCN guard status to …

The TCN sent must be trigged by an event on a trunk link or an entire switch because all VLANs received the topology change notification. It must be something local on switch-b. What can be the reason for originating these TCNs?

The train communication network (TCN) is a hierarchical combination of two fieldbus networks for data transmission within trains. It consists of the Multifunction Vehicle Bus (MVB) inside each vehicle and of the Wire Train Bus (WTB) to connect the different vehicles. The TCN components have been standardized in IEC 61375.

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