Digital Data Communications Level One GTL-2091 Manual de usuario

STP Optional Characteristic

Configuration Commands

(GTL-2091)

V1.0

Digital Data Communications GmbH, Germany.

http://www.level1.com

Table of Contents

- I -

Table of Contents

Chapter 1 STP Optional Characteristic Configuration Commands...................................................................................1

1.1 STP Optional Characteristic Configuration Commands ....................................................................................1

1.1.1 spanning-tree portfast .........................................................................................................................1

1.1.2 spanning-tree bpduguard ....................................................................................................................2

1.1.3 spanning-tree bpdufilter.......................................................................................................................3

1.1.4 spanning-tree uplinkfast ......................................................................................................................4

1.1.5 spanning-tree backbonefast ................................................................................................................4

1.1.6 spanning-tree guard............................................................................................................................5

1.1.7 spanning-tree loopguard .....................................................................................................................6

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STP Optional Characteristic Configuration Commands

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Chapter 1 STP Optional Characteristic Configuration

Commands

1.1 STP Optional Characteristic Configuration Commands

1.1.1 spanning-tree portfast

Description

To enable bridge protocol data unit (BPDU) filtering by default on all PortFast ports,

use the spanning-tree portfast command in global configuration mode. To return to

the default settings, use the negative form of this command.

spanning-tree portfast {bpdufilter default | bpduguard default | default}

no spanning-tree portfast {bpdufilter default | bpduguard default | default}

To enable PortFast mode where the interface is immediately put into the forwarding

state upon linkup without waiting for the timer to expire, use the spanning-tree portfast

command in interface configuration mode. To return to the default settings, use the

negative form of this command.

spanning-tree portfast [disable | trunk]

no spanning-tree portfast

Parameter

Description

bpdufilter default

Enables bpdu flter.

bpduguard default

Enables bpdu guard.

default

Specifies the default method.

Default

Disabled

Instruction

In SSTP/PVST mode, the Port Fast characteristic makes a port immediately enter

Forwarding state without experiencing any status change process. This configuration is

invalid in RSTP/MSTP mode.

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STP Optional Characteristic Configuration Commands

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After configuring Port Fast, BPDU Guard or BPDU Filter needs to be configured for

protection.

Command mode

Global or interface configuration mode

Example

This example shows how to enable PortFast mode globally:

Console_config# spanning-tree portfast default

Console_config#

This example shows how to enable PortFast mode on the interface f0/0:

Console_config_f0/0# spanning-tree portfast

Console_config_f0/0#

1.1.2 spanning-tree bpduguard

Description

To enable bridge protocol data unit (BPDU) guard on the interface, use the

spanning-tree bpduguard command in interface configuration mode. To return to the

default settings, use the negative form of this command.

spanning-tree bpduguard {disable | enable}

no spanning-tree bpduguard

Parameter

None

Default

Disabled

Instruction

In SSTP/PVST mode, if a port that configured BPDU Guard and Port Fast receives

BPDU, this port will be forced to shutdown. User can restore it by the manual

configuration. In RSTP/MSTP mode, if a port that configured BPDU Guard receives

BPDU, this port will be configured to Blocking state for a period of time.

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STP Optional Characteristic Configuration Commands

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Command mode

Interface configuration

Example

This example shows how to enable BPDU guard on this interface:

Console_config_f0/0# spanning-tree bpduguard enable

Console_config_f0/0#

1.1.3 spanning-tree bpdufilter

Description

To enable bridge protocol data unit (BPDU) filtering on the interface, use the

spanning-tree bpdufilter command in interface configuration mode. To return to the

default settings, use the negative form of this command.

spanning-tree bpdufilter {disable |enable}

no spanning-tree bpdufilter

Parameter

None

Default

Disabled

Instruction

In SSTP/PVST mode, if a port that configured BPDU Filter and Port Fast receives

BPDU, the BPDU Filter and Port Fast characteristics on that port will be disabled

automatically to restore the port to an ordinary port. Then this port must endure the

wait from Listening to Learning before entering Forwarding state.

This feature is invalid in RSTP/MSTP mode.

Command mode

Interface configuration

Example

This example shows how to enable BPDU filtering on this interface:

Console_config_f0/0# spanning-tree bpdufilter enable

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STP Optional Characteristic Configuration Commands

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Console_config_f0/0#

1.1.4 spanning-tree uplinkfast

Description

To enable the debugging of the spanning-tree UplinkFast events, use the debug

spanning-tree uplinkfast command. To disable the debugging output, use the

negative form of this command.

spanning-tree uplinkfast [max-update-rate pkts-per-second]

no spanning-tree uplinkfast [max-update-rate]

Parameter

None

Default

disabled

Instruction

Uplink Fast characteristic is only valid in SSTP/PVST mode.

Command mode

Global configuration

Example

The following example enables uplinkfast characteristic:

Console_config# spanning-tree uplinkfast

Console_config#

1.1.5 spanning-tree backbonefast

Description

To enable debugging of the spanning-tree BackboneFast events, use the debug

spanning-tree backbonefast command. To disable the debugging output, use the

negative form of this command.

spanning-tree backbonefast

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STP Optional Characteristic Configuration Commands

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no spanning-tree backbonefast

Parameter

None

Default

Disabled

Instruction

Backbone Fast characteristic is only valid in SSTP/PVSTmode.

Command mode

Global configuration

Example

The following command enables backbonefast characteristic:

Console_config# spanning-tree backbonefast

Console_config#

1.1.6 spanning-tree guard

Description

To enable or disable the guard mode, use the spanning-tree guard command in

interface configuration mode. To return to the default settings, use the negative form of

this command.

spanning-tree guard {loop | none | root}

no spanning-tree guard

Parameter

Description

loop

Enables the loop-guard mode on the interface. Value is from 1

to 0xfe.

none

Sets the guard mode to none. Value is 48-bit.

root

Enables root-guard mode on the interface.

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STP Optional Characteristic Configuration Commands

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Default

Disabled

Instruction

Root Guard characteristic can prevent a port from becoming Root port due to receving

high priority BPDU.

Loop Guard characteristic can protect a Root Port or a Alternate Port when it becomes

the Designated Port. This function can prevent a port from occuring the loop when it

cannot continuously receive BPDU.

Command mode

Interface configuration

Example

This example shows how to enable root guard:

Console_config_f0/0# spanning-tree guard root

Console_config_f0/0#

1.1.7 spanning-tree loopguard

Description

To enable loop guard as a default on all ports of a given bridge, use the spanning-tree

loopguard default command in global configuration mode. To disable loop guard, use

the negative form of this command.

spanning-tree loopguard default

Parameter

None

Default

None

Instruction

None

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STP Optional Characteristic Configuration Commands

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Command mode

Global configuration

Example

The following command enables loopguard function:

Console_config# spanning-tree loopguard default

Console_config#

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