Allied Telesis AT-S94 Guia do Utilizador descarregar pdf (Página 139)

Configuring Spanning Tree

Configuring Classic Spanning Tree

Page 139

• 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. The possible field values

are:

– Enable — Enables Port Fast.

– Disable — Disables Port Fast.

– Auto — Indicates that Port Fast mode is enabled a few seconds after the interface becomes active.

• Root Guard — Prevents devices outside the network core from being assigned the spanning tree root. The

possible field values are:

– Enable — Enables Root Guard.

– Disable — Disables Root Guard.

• BPDU Guard — Protects the network from invalid configurations by shutting down an interface when a

BPDU message is received. The possible field values are:

– Enable — Enables BPDU Guard.

– Disable — Disables BPDU Guard.

• 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 currently in the listening mode. The interface cannot forward traffic

nor can it learn MAC addresses.

– Learning — Indicates the port is currently in the learning mode. The interface cannot forward traffic;

however, it can learn new MAC addresses.

– Forwarding — Indicates the port is currently in the forwarding mode. The port can forward traffic and

learn new MAC addresses. The interface can forward traffic and learn new MAC addresses.

• Port Role — Displays the port role assigned by the STP algorithm to provide to STP paths. The possible field

values are:

– Root — Provides the lowest cost path to forward packets to the root switch.

– Designated — The port or trunk through 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, or when a LAN has two

or more connections connected to a shared segment.

– Disabled — The port is not participating in the Spanning Tree.

• 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 is rerouted.

• Priority — Indicates the priority value of the port connected to the selected port. A lower priority increases

the probability of connecting to a root port. The priority value is between 0-240. The priority value is

determined in increments of 16.

• Designated Bridge ID — Indicates the bridge priority and the MAC Address of the designated bridge.

• Designated Port ID — Indicates the designated port 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.

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