User Manual

Configure Switching Information
154
M4100 Series Managed Switch
This setting configures the BPDU flood, which floods the BPDU traffic arriving on this port
when STP is disabled on this port.
15. In the Auto Edge field select Disable or Enable.
This configures the auto edge mode of a port, which allows the port to become an edge
port if it does not see BPDUs for some duration.
16. In the Root Guard field, select Disable or Enable.
This configures the root guard mode, which sets a port to discard any superior
information received by the port and thus protects the root of the device against changing.
The port gets put into the discarding state and does not forward any packets.
17. Use Loop Guard to configure the loop guard on the port to protect Layer 2 forwarding loops.
If loop guard is enabled, the port moves into the STP loop inconsistent blocking state instead
of the listening/learning/forwarding state.
18. Use TCN Guard to configure the
TCN guard for a port restricting the port from propagating
any topology change information received through that port.
The possible values are Enable or Disable.
19. Use Port Mode to enable or disable Spanning
Tree Protocol administrative mode associated
with the port or port channel.
The possible values are Enable or Disable.
The following table describes the nonconfigurable information displayed on the screen.
Table 45. CST Port Configuration
Field Description
Auto Calculated Port Path Cost Displays whether the path cost is automatically calculated (Enabled) or
not (Disabled). Path cost is calculated based on the link speed of the
port if the configured value for port path cost is zero.
Hello Timer Displays the value of the parameter for the CST.
Auto Calculated External Port Path
Cost
Displays whether the external path cost is automatically calculated
(Enabled) or not (Disabled). External Path cost is calculated based on
the link speed of the port if the configured value for external port path
cost is zero.
BPDU Guard Effect The BPDU guard effect disables the edge ports that receive BPDU
packets.
The possible values are Enable or Disable.
Port Forwarding State The forwarding state of this port.
View Spanning Tree CST Port Status
 To view the Spanning Tree CST port status:
1. Prepare your computer with a static IP address in the 169.254.100.0 subnet, for
example, 169.254.100.201.