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Spanning Tree Commands: Dell PowerConnect 3324/3348 Switch CLI Guide

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Spanning Tree Commands

Dell™ PowerConnect™ 3324/3348 Switch CLI Guide

  spanning-tree

  spanning-tree mode

  spanning-tree forward-time

  spanning-tree hello-time

  spanning-tree max-age

  spanning-tree priority

  spanning-tree disable

  spanning-tree cost

  spanning-tree port-priority

  spanning-tree portfast

  clear spanning-tree detected-protocols

  spanning-tree link-type

  show spanning-tree



spanning-tree

Use the spanning-tree global configuration command to enable spanning tree functionality. To disable spanning tree functionality, use the no form of this command.

Syntax

spanning-tree

no spanning-tree

Default Configuration

Spanning tree is enabled.

Command Modes

Global Configuration Mode

User Guidelines

There are no user guidelines for this command.

Example

The following example enables spanning tree functionality.

Console(config)# spanning-tree


spanning-tree mode

Use the spanning-tree mode global configuration command to configure the spanning tree protocol currently running. To return to the default configuration, use the no form of this command.

Syntax

spanning-tree mode {stp | rstp}

no spanning-tree mode

    • stp—RSTP is not supported

    • rstp—RSTP is supported

Default Configuration

spanning tree protocol is supported (stp).

Command Modes

Global Configuration Mode

User Guidelines

There are no user guidelines for this command.

Example

The following example configures the spanning tree protocol to RSTP.

Console(config)# spanning-tree mode rstp


spanning-tree forward-time

Use the spanning-tree forward-time global configuration command to configure the spanning tree bridge forward time, which is the amount of time a port remains in the listening and learning states before entering the forwarding state.

To reset the default forward time, use the no form of this command.

Syntax

spanning-tree forward-time seconds

no spanning-tree forward-time

    • seconds—Time in seconds (Range: 4-30).

Default Configuration

The default forwarding-time for IEEE Spanning Tree Protocol (STP) is 15 seconds.

Command Modes

Global Configuration Mode

User Guidelines

There are no user guidelines for this command.

Example

The following example configures spanning tree bridge forward time.

Console(config)# spanning-tree forward-time 25


spanning-tree hello-time

Use the spanning-tree hello-time global configuration command to configure the spanning tree bridge hello time, which is how often the switch broadcasts hello messages to other switches only if it is the root bridge. To reset the default hello time, use the no form of this command.

Syntax

spanning-tree hello-time seconds

no spanning-tree hello-time

    • seconds—Time in seconds (Range: 1-10).

Default Configuration

The default hello time for IEEE Spanning Tree Protocol (STP) is 2 seconds.

Command Modes

Global Configuration Mode

User Guidelines

There are no user guidelines for this command.

Example

The following example configures spanning tree bridge hello time.

Console(config)# spanning-tree hello-time 5


spanning-tree max-age

Use the spanning-tree max-age global configuration command to configure the spanning tree bridge maximum age. To reset the default maximum age, use the no form of this command.

Syntax

spanning-tree max-age seconds

no spanning-tree max-age

    • seconds -Time in seconds (Range: 6-40).

Default Configuration

The default max-age for IEEE STP is 20 seconds.

Command Modes

Global Configuration Mode

User Guidelines

There are no user guidelines for this command.

Example

The following example configures the spanning tree bridge maximum-age.

Console(config)# spanning-tree max-age 10


spanning-tree priority

Use the spanning-tree priority global configuration command to configure the spanning tree priority. The priority value is used to determine which bridge is elected as the root bridge. To reset the default spanning tree priority, use the no form of this command.

Syntax

spanning-tree priority priority

no spanning-tree priority

    • priority—Priority of the bridge (Range: 0-61440 in steps of 4096).

Default Configuration

The default STP bridge priority according to IEEE 802.10 is 32768.

Command Modes

Global Configuration Mode

User Guidelines

The lower the priority, the more likely the bridge is to be elected as the root bridge.

Example

The following example configures spanning tree priority.

Console(config)# spanning-tree priority 12288


spanning-tree disable

Use the spanning-tree disable interface configuration command to disable spanning tree on a specific port. To enable spanning tree on a port, use the no form of this command.

Syntax

spanning-tree disable

no spanning-tree disable

Default Configuration

By default, all ports are enabled for spanning tree.

Command Modes

Interface Configuration (Ethernet, port-channel) Mode

User Guidelines

There are no user guidelines for this command.

Example

The following example disables the spanning tree on port 1/e5.

Console(config)# interface ethernet 1/e5

Console(config-if)# spanning-tree disable


spanning-tree cost

Use the spanning-tree cost interface configuration command to configure the spanning tree path cost for a port. To reset the default port path cost, use the no form of this command.

Syntax

spanning-tree cost cost

no spanning-tree cost

    • cost—The port path cost (Range: 1-65535).

Default Configuration

The default costs are as follows:

    • Port-channel—4

    • 1 Giga—4

    • 100M—19

    • 10M—100

Command Modes

Interface Configuration (Ethernet, port-channel) Mode

User Guidelines

There are no user guidelines for this command.

Example

The following example configures spanning tree cost on port 1/e5 to 35000.

Console(config)# interface ethernet 1/e5

Console(config-if)# spanning-tree cost 35000


spanning-tree port-priority

Use the spanning-tree port-priority interface configuration command to configure port priority. To reset the default port priority, use the no form of this command.

Syntax

spanning-tree port-priority priority

no spanning-tree port-priority

    • priority—The port priority (Range: 0-240 in steps of 16).

Default Configuration

The default port-priority for IEEE 802.10 (STP) is 128.

Command Modes

Interface Configuration (Ethernet, port-channel) Mode

User Guidelines

There are no user guidelines for this command.

Example

The following example configures spanning priority on port 1/e5 to 96.

Console(config)# interface ethernet 1/e5

Console(config-if)# spanning-tree port-priority 96


spanning-tree portfast

Use the spanning-tree portfast interface configuration command to enable PortFast Mode. In PortFast Mode, the interface is immediately put into the forwarding state upon linkup, without waiting for the timer to expire. To disable PortFast Mode, use the no form of this command. This command when in rstp mode sets port to an edgeport.

Syntax

spanning-tree portfast

no spanning-tree portfast

Default Configuration

PortFast Mode is disabled.

Command Modes

Interface Configuration (Ethernet, port-channel) Mode

User Guidelines

This feature should be used only with interfaces connected to end stations. Otherwise, an accidental topology loop could cause a data packet loop and disrupt switch and network operations.

Example

The following example enables PortFast Mode on port 1/e5.

Console(config)# interface ethernet 1/e5

Console(config-if)# spanning-tree portfast


clear spanning-tree detected-protocols

Use the clear spanning-tree detected-protocols privileged EXEC command to restart the protocol migration process (force the renegotiation with neighboring switches) on all interfaces or on the specified interface.

Syntax

clear spanning-tree detected-protocols [ethernet interface | port-channel port-channel-number]

    • interface—An ethernet port. The full syntax is: unit/port.

    • port-channel-number—A port-channel index.

Default Configuration

If no interface is specified, the action is applied to all interfaces.

Command Modes

Privileged EXEC Mode

User Guidelines

This feature should be used only when working in RSTP mode. It is used to force the port to test if it can migrate to RSTP.

Example

The following example restarts the protocol migration process (forces the renegotiation with neighboring switches) on port 1/e3.

Console# clear spanning-tree detected-protocols ethernet 1/e3


spanning-tree link-type

Use the spanning-tree link-type interface configuration command to override the default link-type setting. To reset the default, use the no form of this command.

Syntax

spanning-tree link-type {point-to-point | shared}

no spanning-tree spanning-tree link-type

    • point-to-point—Specify the port link type as point-to-point.

    • shared—Specify that the port link type is shared.

Default Configuration

The switch derives the link type of a port from the duplex mode. A full-duplex port is considered a point-to-point link, and a half-duplex port is considered a shared link.

Command Modes

Interface Configuration (Ethernet, port-channel) Mode

User Guidelines

There are no user guidelines for this command.

Example

The following example forces shared link-type on port 1/e5.

Console(config)# interface ethernet 1/e5

Console(config-if)# spanning-tree link-type shared


show spanning-tree

Use the show spanning-tree privileged EXEC command to display spanning tree configuration.

Syntax

show spanning-tree [ethernet interface | port-channel port-channel-number]

    • interface—An ethernet port. The full syntax is: unit/port.

    • port-channel-number—A port-channel index.

Default Configuration

This command has no default configuration.

Command Modes

Privileged EXEC Mode

User Guidelines

There are no user guidelines for this command.

Examples

The following example displays spanning tree information.

Console# show spanning-tree

Spanning tree enabled mode RSTP

Root ID Priority 32768

Address 0001.4297.e000

Cost 57

Port 1/e1

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32769

Address 0002.4b29.7a00

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Number of topology changes 2 last change occurred 2d18h ago

Times: hold 1, topology change 35, notification 2

hello 2, max age 20, forward delay 15

Interface Port ID Designated Port ID

Name Prio.Nbr Sts Cost Cost Bridge ID Prio.Nbr

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

1/e1 128.1 FWD 19 38 32768 0030.9441.62c1 128.25

1/e2 128.2 FWD 19 57 32769 0002.4b29.7a00 128.2

ch1 128.65 FWD 19 57 32769 0002.4b29.7a00 128.65

The following example displays spanning tree information for port 1/e1.

Console# show spanning-tree ethernet 1/e1

Interface Port ID Designated Port ID

Name Prio.Nbr Cost Sts Cost Bridge ID Prio.Nbr

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

1/e1 128.1 19 FWD 38 32768 0030.9441.62c1 128.25

Spanning tree enabled

Type: point-to-point (configured: auto)

Port Fast: no (configured: no)

Number of transitions to forwarding state: 1

BPDU: sent 2, received 120638


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