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Chapter 5
Advanced Configuration
46
WebView Switches
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
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
network topologies that allow a faster STP convergence
without creating forwarding loops.
Spanning Tree > RSTP Port Settings
Interface Displays the port or LAG on which Rapid STP
is enabled.
Role Indicates the port role assigned by the STP algorithm
in order to provide to STP paths. The possible field values
are:
Root • Provides the lowest cost path to forward packets
to root switch.
Designated • Indicates that the port or LAG via which
the designated switch is attached to the LAN.
Alternate • Provides an alternate path to the root
switch from the root interface.
Backup • Provides a backup path to the designated
port path toward the Spanning Tree leaves. Backup
ports occur only when two ports are connected in a
loop by a point-to-point link. Backup ports also occur
when a LAN has two or more connections connected
to a shared segment.
Disabled • Indicates the port is not participating in the
Spanning Tree.
Mode Indicates the current Spanning Tree mode. The
Spanning Tree mode is selected in the Global STP screen.
The possible field values are:
Classic STP • Indicates that Classic STP is enabled on
the device.
Rapid STP • Indicates that Rapid STP is enabled on the
device.