Cisco SRW2024P User Guide - Page 53

Designated Port ID

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Chapter 5 Advanced Configuration 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. WebView Switches 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. 46

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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.