Hirschmann GREYHOUND GRS1020, Справочное руководство

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214
RM GUI GRS
Release 8.0 09/2019
Possible values:

marked
The monitoring of STP-BPDUs is active.
– If the port receives an STP-BPDU with better path information to the root bridge, then the
device discards the STP-BPDU and sets the status of the port to the value discarding
instead of root .
– If there are no STP-BPDUs with better path information to the root bridge, then the device
resets the status of the port after 2 × Hello time [s] .

unmarked (default setting)
The monitoring of STP-BPDUs is inactive.
TCN guard
Activates/deactivates the monitoring of "Topology Change Notifications" on the port. With this
setting the device helps you protect your network from attacks with STP-BPDUs that try to change
the topology.
Possible values:

marked
The monitoring of "Topology Change Notifications" is enabled.
– The port ignores the Topology Change flag in received STP-BPDUs.
– If the received BPDU contains other information that causes a topology change, then the
device processes the BPDU even if the TCN guard is enabled.
Example: The device receives better path information for the root bridge.

unmarked (default setting)
The monitoring of "Topology Change Notifications" is disabled.
If the device receives STP-BPDUs with a Topology Change flag, then the device deletes the
address table of the port and forwards the Topology Change Notifications.
Loop guard
Activates/deactivates the monitoring of loops on the port. The prerequisite is that the
Root guard
function is inactive.
With this setting the device helps prevent loops if the port does not receive any more STP-BPDUs.
Use this setting only for ports with the STP role
alternate
,
backup
or
root
.
Possible values:

marked
The monitoring of loops is active. This helps prevent loops for example, if you disable the
Spanning Tree function on the remote device or if the connection is interrupted only in the
receiving direction.
– If the port does not receive any STP-BPDUs for a while, then the device sets the status of
the port to the value discarding and the value in the Loop state column to true .
– If the port receives STP-BPDUs again, then the device sets the status of the port to a value
according to Port role and the value in the Loop state column to false .

unmarked (default setting)
The monitoring of loops is inactive.
If the port does not receive any STP-BPDUs for a while, then the device sets the status of the
port to the value
forwarding
.
Loop state
Displays whether the loop state of the port is inconsistent.