Redundancy
12.4
The Rapid Spanning Tree Protocol
172
UM Config GRS
Release
8.0
09/2019
12.4.7
Guards
The device lets you activate various protection functions (guards) in the device ports.
The following protection functions help protect your network from incorrect configurations, loops
and attacks with STP-BPDUs:
BPDU Guard – for manually specified edge ports (end device ports)
You activate this protection function globally in the device.
Terminal device ports do not normally receive any STP-BPDUs. If an attacker still attempts to
feed in STP-BPDUs on this port, then the device deactivates the device port.
Root Guard – for designated ports
You activate this protection function separately for every device port.
When a designated port receives an STP-BPDU with better path information to the root bridge,
the device discards the STP-BPDU and sets the transmission state of the port to
discarding
instead of
root
.
When there are no STP-BPDUs with better path information to the root bridge, after 2 x
Hello
time [s]
the device resets the state of the port to a value according to the port role.
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