Switch User Manual

Chapter 5
Advanced Configuration
43
8-Port 10/100 Ethernet Switch with Webview
Spanning Tree > STP Port Settings
Spanning Tree > STP Port Settings
Network administrators can assign STP settings to specific
interfaces using the STP Interface Settings screen.
The STP Interface Settings screen contains the following
fields:
Interface Indicates the port or LAG on which STP is
enabled.
STP Indicates if STP is enabled on the port.
Port Fast Indicates if Fast Link is enabled on the port.
If Fast Link mode is enabled for a port, the Port State
is automatically placed in the Forwarding state when
the port link is up. Fast Link optimizes the STP protocol
convergence. STP convergence can take 30-60 seconds in
large networks.
Port State Displays the current STP state of a port. If
enabled, the port state determines what forwarding
action is taken on traffic. Possible port states are:
Disabled • Indicates that STP is currently disabled on
the port. The port forwards traffic while learning MAC
addresses.
Blocking • Indicates that the port is currently blocked
and cannot forward traffic or learn MAC addresses.
Blocking is displayed when Classic STP is enabled.
Listening • Indicates that the port is in Listening mode.
The port cannot forward traffic nor can it learn MAC
addresses.
Learning • Indicates that the port is in Learning
mode. The port cannot forward traffic,
however it can learn new MAC addresses.
Forwarding • Indicates that the port is in Forwarding
mode. The port can forward traffic and learn new MAC
addresses.
Speed Indicates the speed at which the port is
operating.
Path Cost Indicates the port contribution to the root
path cost. The path cost is adjusted to a higher or lower
value, and is used to forward traffic when a path being
rerouted.
Default Path Cost When selected the default path cost
is implemented.
Priority Priority value of the port. The priority value
influences the port choice when a bridge has two ports
connected in a loop. The priority value is between 0 -240.
The priority value is provided in increments of 16.
Designated Bridge ID Indicates the bridge priority and
the MAC Address of the designated bridge.
Designated Port ID Indicates the selected port’s priority
and interface.
Designated Cost Indicates the cost of the port
participating in the STP topology. Ports with a lower cost
are less likely to be blocked if STP detects loops.
Forward Transitions Indicates the number of times the
port has changed from the Blocking state to Forwarding
state.
Spanning Tree > RSTP Port Settings
Spanning Tree > RSTP Port Settings
While the classic spanning tree prevents Layer 2 forwarding
loops in a general network topology, convergence can take
between 30-60 seconds. This time may delay detecting
possible loops, and propagating status topology changes.
Rapid Spanning Tree Protocol (RSTP) detects and uses