Spanning Tree Algorithm Configuration

 

 

 

3

CLI – This example shows the STA attributes for port 5.

 

 

 

 

 

 

Console#show spanning-tree ethernet 1/5

4-235

 

Eth 1/ 5 information

 

 

 

 

--------------------------------------------------------------

 

 

 

Admin status:

enabled

 

 

 

Role:

disable

 

 

 

State:

discarding

 

 

 

Path cost:

10000

 

 

 

Priority:

128

 

 

 

Designated cost:

0

 

 

 

Designated port

: 128.5

 

 

 

Designated root:

32768.0012CF0B0D00

 

 

 

Designated bridge:

32768.0012CF0B0D00

 

 

 

Fast forwarding:

disabled

 

 

 

Forward transitions:

0

 

 

 

Admin edge port:

disabled

 

 

 

Oper edge port:

disabled

 

 

 

Admin Link type:

auto

 

 

 

Oper Link type:

point-to-point

 

 

 

Spanning Tree Status:

enabled

 

 

 

Console#

 

 

 

 

Configuring Interface Settings

You can configure RSTP and MSTP attributes for specific interfaces, including port priority, path cost, link type, and edge port. You may use a different priority or path cost for ports of the same media type to indicate the preferred path, link type to indicate a point-to-point connection or shared-media connection, and edge port to indicate if the attached device can support fast forwarding. (References to “ports” in this section means “interfaces,” which includes both ports and trunks.)

Command Attributes

The following attributes are read-only and cannot be changed:

STA State – Displays current state of this port within the Spanning Tree. (See Displaying Interface Settings on page 3-144for additional information.)

-Discarding - Port receives STA configuration messages, but does not forward packets.

-Learning - Port has transmitted configuration messages for an interval set by the Forward Delay parameter without receiving contradictory information. Port address table is cleared, and the port begins learning addresses.

-Forwarding - Port forwards packets, and continues learning addresses.

Trunk – Indicates if a port is a member of a trunk. (STA Port Configuration only)

The following interface attributes can be configured:

Spanning Tree – Enables/disables STA on this interface. (Default: Enabled).

Priority – Defines the priority used for this port in the Spanning Tree Protocol. If the path cost for all ports on a switch are the same, the port with the highest priority (i.e., lowest value) will be configured as an active link in the Spanning Tree. This makes a port with higher priority less likely to be blocked if the Spanning Tree

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Accton Technology ES3528M-SFP manual Configuring Interface Settings, CLI This example shows the STA attributes for port