Redundancy
12.4
The Rapid Spanning Tree Protocol
173
UM Config GRS
Release
8.0
09/2019
TCN Guard – for ports that receive STP-BPDUs with a Topology Change flag
You activate this protection function separately for every device port.
If the protection function is activated, then the device ignores Topology Change flags in received
STP-BPDUs. This does not change the content of the address table (FDB) of the device port.
However, additional information in the BPDU that changes the topology is processed by the
device.
Loop Guard – for root, alternate and backup ports
You activate this protection function separately for every device port.
If the port does not receive any more STP-BPDUs, then this protection function helps prevent
the transmission status of a port from unintentionally being changed to
forwarding
. If this
situation occurs, then the device designates the loop status of the port as inconsistent, but does
not forward any data packets.
Activating the BPDU Guard
Open the
Switching > L2-Redundancy > Spanning Tree > Global
dialog.
Mark the
BPDU guard
checkbox.
To save the changes temporarily, click the button.
enable
Change to the Privileged EXEC mode.
configure
Change to the Configuration mode.
spanning-tree bpdu-guard
Activates the BPDU Guard.
show spanning-tree global
Displays the parameters for checking.
Hacker
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