Support of the H3C WX series access controllers for spanning tree commands may vary by device model. For more information, see About the WX Series Access Controllers Command References.

active region-configuration

Syntax

active region-configuration

View

MST region view

Default level

2: System level

Parameters

None

Description

Use active region-configuration to activate your MST region configuration.

When you configure MST region–related parameters, especially the VLAN-to-instance mapping table, MSTP will launch a new spanning tree calculation process, which may result in network topology instability.

To reduce the possibility of topology instability caused by configuration, MSTP will not immediately launch a new spanning tree calculation process when processing MST region–related configurations. The launch will only occur after you activate the MST region–related parameters by using this command, or enable the spanning tree feature by using the stp enable command in the case that no spanning tree protocol is enabled.

H3C recommends you to use the check region-configuration command to determine whether the MST region configurations to be activated are correct and that you run this command only if they are correct.

Related commands: instance, region-name, revision-level, vlan-mapping modulo, and check region-configuration.

Examples

# Map VLAN 2 to MSTI 1 and manually activate the MST region configuration.

<Sysname> system-view

[Sysname] stp region-configuration

[Sysname-mst-region] instance 1 vlan 2

[Sysname-mst-region] active region-configuration

check region-configuration

Syntax

check region-configuration

View

MST region view

Default level

2: System level

Parameters

None

Description

Use check region-configuration to display MST region pre-configuration information, including the region name, revision level, and VLAN-to-instance mapping settings.

Two or more spanning tree devices belong to the same MST region only if they are configured with the same format selector (0 by default, not configurable), MST region name, MST region revision level, and the same VLAN-to-instance mapping entries in the MST region, and they are connected via a physical link.

H3C recommends that you use this command to determine whether the MST region configurations to be activated are correct and that you activate them only if they are correct.

Related commands: instance, region-name, revision-level, vlan-mapping modulo, and active region-configuration.

Examples

# Display MST region pre-configurations.

<Sysname> system-view

[Sysname] stp region-configuration

[Sysname-mst-region] check region-configuration

Admin Configuration

Format selector :0

Region name :000fe26a58ed

Revision level :0

Configuration digest :0x41b5018aca57daa8dcfdba2984d99d06

Instance Vlans Mapped

0 1 to 9, 11 to 4094

15 10

Table 1 Command output

Field	Description
Format selector	Format selector of the MST region, which is 0 (not configurable).
Region name	MST region name.
Revision level	Revision level of the MST region.
Instance Vlans Mapped	VLAN-to-instance mappings in the MST region.

display stp

Syntax

display stp [ instance instance-id ] [ interface interface-list ] [ brief ] [ | { begin | exclude | include } regular-expression ]

View

Any view

Default level

1: Monitor level

Parameters

instance instance-id: Displays the status and statistics of a specific MSTI. The value of instance-id ranges from 0 to 15, where 0 represents the common internal spanning tree (CIST).

interface interface-list: Displays the spanning tree status and statistics on the ports specified by a port list, in the format of interface-list = { interface-type interface-number [ to interface-type interface-number ] }&<1-10>, where &<1-10> indicates that you can specify up to 10 ports or port ranges.

brief: Displays brief spanning tree status and statistics.

|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.

begin: Displays the first line that matches the specified regular expression and all lines that follow.

include: Displays all lines that match the specified regular expression.

regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.

Description

Use display stp to display the spanning tree status and statistics.

Based on the spanning tree status and statistics, you can analyze and maintain the network topology or check whether spanning tree is working normally.

In STP/RSTP mode:

· If you do not specify any port, this command displays the spanning tree information for all ports. The displayed information is sorted by port name.

· If you specify a port list, this command displays the spanning tree information for the specified ports. The displayed information is sorted by port name.

In MSTP mode:

· If you do not specify any MSTI or port, this command displays the spanning tree information of all MSTIs on all ports. The displayed information is sorted by MSTI ID and by port name in each MSTI.

· If you specify an MSTI but not a port, this command displays the spanning tree information on all ports in that MSTI. The displayed information is sorted by port name.

· If you specify some ports but not an MSTI, this command displays the spanning tree information of all MSTIs on the specified ports. The displayed information is sorted by MSTI ID, and by port name in each MSTI.

· If you specify both an MSTI ID and a port list, this command displays the spanning tree information on the specified ports in the specified MSTI. The displayed information is sorted by port name.

The MSTP status information includes:

· CIST global parameters: Protocol operating mode, device priority in the CIST (Priority), MAC address, hello time, max age, forward delay, maximum hops, common root bridge of the CIST, external path cost from the device to the CIST common root, regional root, the internal path cost from the device to the regional root, CIST root port of the device, and status of the BPDU guard function (enabled or disabled).

· CIST port parameters: Port status, role, priority, path cost, designated bridge, designated port, edge port/non-edge port, connecting to a point-to-point link or not, maximum transmission rate (transmit limit), status of the root guard function (enabled or disabled), BPDU format, boundary port/non-boundary port, hello time, max age, forward delay, message age, remaining hops, and status of rapid state transition (enabled or disabled) for designated ports.

· MSTI global parameters: MSTI ID, bridge priority of the MSTI, regional root, internal path cost, MSTI root port, and master bridge.

· MSTI port parameters: Port status, role, priority, path cost, designated bridge, designated port, remaining hops, and status of rapid state transition (enabled or disabled) for designated ports.

The statistics in STP/RSTP/MSTP mode include:

· The number of TCN BPDUs, configuration BPDUs, RST BPDUs and MST BPDUs sent from each port

· The number of TCN BPDUs, configuration BPDUs, RST BPDUs, MST BPDUs and wrong BPDUs received on each port

· The number of BPDUs discarded on each port

Related commands: reset stp.

Examples

# In MSTP mode, display the brief spanning tree status and statistics of MSTI 0 on ports GigabitEthernet 1/0/1 through GigabitEthernet 1/0/4.

<Sysname> display stp instance 0 interface gigabitethernet 1/0/1 to gigabitethernet 1/0/4 brief

MSTID Port Role STP State Protection

0 GigabitEthernet 1/0/1 ALTE DISCARDING LOOP

0 GigabitEthernet 1/0/2 DESI FORWARDING NONE

0 GigabitEthernet 1/0/3 DESI FORWARDING NONE

0 GigabitEthernet 1/0/4 DESI FORWARDING NONE

Table 2 Command output

Field	Description
MSTID	MSTI ID in the MST region.
Port	Port name, corresponding to each MSTI.
Role	Port role: · ALTE—The port is an alternate port. · BACK—The port is a backup port. · ROOT—The port is a root port. · DESI—The port is a designated port. · MAST—The port is a master port. · DISA—The port is disabled.
STP State	Spanning tree status on the port: · FORWARDING—The port can receive and send BPDUs, and also forward user traffic. · DISCARDING—The port can receive and send BPDUs, but cannot forward user traffic. · LEARNING—The port is in a transitional state. It can receive and send BPDUs, but cannot forward user traffic.
Protection	Protection type on the port: · ROOT—Root guard · LOOP—Loop guard · BPDU—BPDU guard · NONE—No protection

# In MSTP mode, display the spanning tree status and statistics of all MSTIs on all ports.

<Sysname> display stp

-------[CIST Global Info][Mode MSTP]-------

CIST Bridge :32768.000f-e200-2200

Bridge Times :Hello 2s MaxAge 20s FwDly 15s MaxHop 20

CIST Root/ERPC :0.00e0-fc0e-6554 / 200200

CIST RegRoot/IRPC :32768.000f-e200-2200 / 0

CIST RootPortId :128.48

BPDU-Protection :disabled

Bridge Config-

Digest-Snooping :disabled

TC or TCN received :2

Time since last TC :0 days 0h:5m:42s

----[Port1(GigabitEthernet 1/0/1)][FORWARDING]----

Port Protocol :enabled

Port Role :CIST Designated Port

Port Priority :128

Port Cost(Legacy) :Config=auto / Active=200

Desg. Bridge/Port :32768.000f-e200-2200 / 128.2

Port Edged :Config=disabled / Active=disabled

Point-to-point :Config=auto / Active=true

Transmit Limit :10 packets/hello-time

Protection Type :None

MST BPDU Format :Config=auto / Active=legacy

Port Config-

Digest-Snooping :disabled

Rapid transition :false

Num of Vlans Mapped :1

PortTimes :Hello 2s MaxAge 20s FwDly 15s MsgAge 2s RemHop 20

BPDU Sent :186

TCN: 0, Config: 0, RST: 0, MST: 186

BPDU Received :0

TCN: 0, Config: 0, RST: 0, MST: 0

-------[MSTI 1 Global Info]-------

MSTI Bridge ID :0.000f-e23e-9ca4

MSTI RegRoot/IRPC :0.000f-e23e-9ca4 / 0

MSTI RootPortId :0.0

MSTI Root Type :PRIMARY root

Master Bridge :32768.000f-e23e-9ca4

Cost to Master :0

TC received :0

# Display the spanning tree status and statistics when the spanning tree feature is disabled.

<Sysname> display stp

Protocol Status :disabled

Protocol Std. :IEEE 802.1s

Version :3

Bridge-Prio. :32768

MAC address :000f-e200-8048

Max age(s) :20

Forward delay(s) :15

Hello time(s) :2

Max hops :20

Table 3 Command output

Field	Description
CIST Bridge	The CIST bridge ID, which comprises the device's priority in the CIST and its MAC address. For example, in output "32768.000f-e200-2200", the value preceding the dot is the device's priority in the CIST, and the value following the dot is the device's MAC address.
Bridge Times	Major parameters for the bridge: · Hello—Hello timer · MaxAge—Max age timer · FWDly—Forward delay timer · Max Hop—Max hops within the MST region
CIST Root/ERPC	CIST root ID and external path cost (the path cost from the device to the CIST root).
CIST RegRoot/IRPC	CIST regional root ID and internal path cost (the path cost from the device to the CIST regional root).
CIST RootPortId	CIST root port ID. "0.0" indicates that the device is the root and there is no root port.
BPDU-Protection	Global status of BPDU protection.
Bridge Config- Digest-Snooping	Global status of Digest Snooping.
TC or TCN received	Number of TC/TCN BPDUs received in the MSTI.
Time since last TC	Time since the latest topology change in the MSTI.
[FORWARDING]	The port is in forwarding state.
[DISCARDING]	The port is in discarding state.
[LEARNING]	The port is in learning state.
Port Protocol	The status of the spanning tree feature on the port.
Port Role	Port role, which can be Alternate, Backup, Root, Designated, Master, or Disabled.
Port Cost(Legacy)	Path cost of the port. The field in parentheses indicates the standard (legacy, dot1d-1998, or dot1t) used for port path cost calculation. · Config—Configured value. · Active—Actual value.
Desg. Bridge/Port	Designated bridge ID and port ID of the port. The port ID displayed is insignificant for a port which does not support port priority.
Port Edged	The port is an edge port or non-edge port. Config indicates the configured value, and Active indicates the actual value.
Point-to-point	The port is connected to a point-to-point link or not. Config indicates the configured value, and Active indicates the actual value.
Transmit Limit	The maximum number of packets sent within each hello time.
Protection Type	Protection type on the port: · Root—Root guard · Loop—Loop guard · BPDU—BPDU guard · None—No protection
MST BPDU Format	Format of the MST BPDUs that the port can send, which can be legacy or 802.1s. · Config—Configured value. · Active—Actual value.
Port Config- Digest-Snooping	The status of Digest Snooping on the port.
Rapid transition	The port rapidly transitions to the forwarding state or not in the MSTI.
Num of Vlans Mapped	The number of VLANs mapped to the current MSTI.
PortTimes	Major parameters for the port: · Hello—Hello timer · MaxAge—Max Age timer · FWDly—Forward delay timer · MsgAge—Message Age timer · Remain Hop—Remaining hops
BPDU Sent	Statistics on sent BPDUs.
BPDU Received	Statistics on received BPDUs.
MSTI RegRoot/IRPC	MSTI regional root/internal path cost.
MSTI RootPortId	MSTI root port ID.
MSTI Root Type	MSTI root type, which can be primary root or secondary root.
Master Bridge	MSTI root bridge ID.
Cost to Master	Path cost from the MSTI to the master bridge.
TC received	Number of received TC BPDUs.
Protocol Status	Spanning tree protocol status.
Protocol Std.	Spanning tree protocol standard.
Version	Spanning tree protocol version.
Max age(s)	Aging timer (in seconds) for BPDUs.
Forward delay(s)	Port state transition delay (in seconds).
Hello time(s)	Interval (in seconds) for the root bridge to send BPDUs.
Max hops	Maximum hops in the MSTI.

display stp abnormal-port

Syntax

display stp abnormal-port [ | { begin | exclude | include } regular-expression ]

View

Any view

Default level

1: Monitor level

Parameters

|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.

begin: Displays the first line that matches the specified regular expression and all lines that follow.

include: Displays all lines that match the specified regular expression.

regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.

Description

Use display stp abnormal-port to display information about ports blocked by spanning tree protection functions.

Examples

# In MSTP mode, display information about ports blocked by spanning tree protection functions.

<Sysname> display stp abnormal-port

MSTID Blocked Port Reason

1 GigabitEthernet1/0/1 ROOT-Protected

2 GigabitEthernet1/0/2 LOOP-Protected

2 GigabitEthernet1/0/3 Formatcompatibility–Protected

Table 4 Command output

Field	Description
Blocked Port	Name of a blocked port, which corresponds to the related MSTI.
Reason	Reason that the port was blocked: · ROOT-Protected—Root guard function. · LOOP-Protected—Loop guard function. · Formatcompatibility-Protected—MSTP BPDU format incompatibility protection function. · InconsistentPortType-Protected—Port type inconsistent protection function.

Field

Description

Blocked Port

Name of a blocked port, which corresponds to the related MSTI.

Reason

Reason that the port was blocked:

· ROOT-Protected—Root guard function.

· LOOP-Protected—Loop guard function.

· Formatcompatibility-Protected—MSTP BPDU format incompatibility protection function.

· InconsistentPortType-Protected—Port type inconsistent protection function.

display stp bpdu-statistics

Syntax

display stp bpdu-statistics [ interface interface-type interface-number [ instance instance-id ] ] [ | { begin | exclude | include } regular-expression ]

View

Any view

Default level

1: Monitor level

Parameters

interface interface-type interface-number: Displays the BPDU statistics on a specified port, where interface-type interface-number indicates the port type and number.

instance instance-id: Displays the BPDU statistics of a specified MSTI on a specified port. The value of instance-id ranges from 0 to 15, where 0 represents the CIST.

|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.

begin: Displays the first line that matches the specified regular expression and all lines that follow.

include: Displays all lines that match the specified regular expression.

regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.

Description

Use display stp bpdu-statistics to display the BPDU statistics on ports.

In MSTP mode:

· If you do not specify any MSTI or port, this command displays the BPDU statistics of all MSTIs on all ports. The displayed information is sorted by port name and by MSTI ID on each port.

· If you specify a port but not an MSTI, this command displays the BPDU statistics of all MSTIs on the port. The displayed information is sorted by MSTI ID.

· If you specify both an MSTI ID and a port, this command displays the BPDU statistics of the specified MSTI on the port.

In STP or RSTP mode:

· If you do not specify any port, this command displays the BPDU statistics of on all ports. The displayed information is sorted by port name.

· If you specify a port, this command displays the BPDU statistics on the port.

Examples

# In MSTP mode, display the BPDU statistics of all MSTIs on GigabitEthernet 1/0/1.

<Sysname> display stp bpdu-statistics interface gigabitethernet 1/0/1

Port: GigabitEthernet1/0/1

Instance-independent:

Type Count Last Updated

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

Invalid BPDUs 0

Looped-back BPDUs 0

MAX-aged BPDUs 0

TCN sent 0

TCN received 0

TCA sent 0

TCA received 2 10:33:12 01/13/2010

Config sent 0

Config received 0

RST sent 0

RST received 0

MST sent 4 10:33:11 01/13/2010

MST received 151 10:37:43 01/13/2010

Instance 0:

Type Count Last Updated

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

Timeout BPDUs 0

MAX-hoped BPDUs 0

TC detected 1 10:32:40 01/13/2010

TC sent 3 10:33:11 01/13/2010

TC received 0

Instance 1:

Type Count Last Updated

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

Timeout BPDUs 0

MAX-hoped BPDUs 0

TC detected 0

TC sent 0

TC received 0

Instance 2:

Type Count Last Updated

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

Timeout BPDUs 0

MAX-hoped BPDUs 0

TC detected 0

TC sent 0

TC received 0

Table 5 Command output

Field	Description
Port	Port name.
Instance-independent	Statistics not related to any particular MSTI.
Type	Statistical item.
Looped-back BPDUs	BPDUs sent and then received by the same port.
Max-Aged BPDUs	BPDUs whose max age was exceeded.
TCN Sent	TCN BPDUs sent.
TCN Received	TCN BPDUs received.
TCA Sent	TCA BPDUs sent.
TCA Received	TCA BPDUs received.
Config Sent	Configuration BPDUs sent.
Config Received	Configuration BPDUs received.
RST Sent	RSTP BPDUs sent.
RST Received	RSTP BPDUs received.
MST Sent	MSTP BPDUs sent.
MST Received	MSTP BPDUs received.
Instance	Statistical information for a particular MSTI.
Timeout BPDUs	Expired BPDUs.
Max-Hoped BPDUs	BPDUs whose maximum hops were exceeded.
TC Detected	TC BPDUs detected.
TC Sent	TC BPDUs sent.
TC Received	TC BPDUs received.

display stp down-port

Syntax

display stp down-port [ | { begin | exclude | include } regular-expression ]

View

Any view

Default level

1: Monitor level

Parameters

|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.

begin: Displays the first line that matches the specified regular expression and all lines that follow.

include: Displays all lines that match the specified regular expression.

regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.

Description

Use display stp down-port to display information about ports shut down by spanning tree protection functions.

Examples

# Display information about ports shut down by spanning tree protection functions.

<Sysname> display stp down-port

Down Port Reason

GigabitEthernet1/0/1 BPDU-Protected

GigabitEthernet1/0/2 Formatfrequency-Protected

Table 6 Command output

Field	Description
Down Port	Name of a port shut down by the spanning tree protection functions.
Reason	Reason that the port was shut down: · BPDU-Protected—BPDU guard function. · Formatfrequency-Protected—MSTP BPDU format frequent change protection function.

Field

Description

Down Port

Name of a port shut down by the spanning tree protection functions.

Reason

Reason that the port was shut down:

· BPDU-Protected—BPDU guard function.

· Formatfrequency-Protected—MSTP BPDU format frequent change protection function.

display stp history

Syntax

display stp [ instance instance-id ] history [ | { begin | exclude | include } regular-expression ]

View

Any view

Default level

0: Visit level

Parameters

instance instance-id: Displays the historical port role calculation information of a specific MSTI. The value of instance-id ranges from 0 to 15, where 0 represents the CIST.

|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.

begin: Displays the first line that matches the specified regular expression and all lines that follow.

include: Displays all lines that match the specified regular expression.

regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.

Description

Use display stp history to display the historical port role calculation information of the specified MSTI or all MSTIs.

In STP or RSTP mode, the displayed information is sorted by port role calculation time.

In MSTP mode:

· If you do not specify any MSTI, this command displays the historical port role calculation information of all MSTIs. The displayed information is sorted by MSTI ID, and by port role calculation time in each MSTI.

· If you specify an MSTI, this command displays the historical port role calculation information of the specified MSTI by the sequence of port role calculation time.

Examples

# In MSTP mode, display the historical port role calculation information in MSTI 2.

<Sysname> display stp instance 2 history

------------------- Instance 2 ---------------------

Port GigabitEthernet1/0/1

Role change : ROOT->DESI (Aged)

Time : 2009/02/08 00:22:56

Port priority : 0.00e0-fc01-6510 0 0.00e0-fc01-6510 128.1

Port GigabitEthernet1/0/2

Role change : ALTER->ROOT

Time : 2009/02/08 00:22:56

Port priority : 0.00e0-fc01-6510 0 0.00e0-fc01-6510 128.2

Table 7 Command output

Field	Description
Port	Port name.
Role change	A role change of the port ("Age" means that the change was caused by expiration of the received configuration BPDU).
Time	Time of port role calculation.
Port priority	Port priority.

display stp region-configuration

Syntax

display stp region-configuration [ | { begin | exclude | include } regular-expression ]

View

Any view

Default level

1: Monitor level

Parameters

|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.

begin: Displays the first line that matches the specified regular expression and all lines that follow.

include: Displays all lines that match the specified regular expression.

regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.

Description

Use display stp region-configuration to display effective configuration information of the MST region, including the region name, revision level, and user-configured VLAN-to-instance mappings.

Related commands: instance, region-name, revision-level, and vlan-mapping modulo.

Examples

# In MSTP mode, display effective MST region configuration information.

<Sysname> display stp region-configuration

Oper Configuration

Format selector :0

Region name :hello

Revision level :0

Configuration digest :0x5f762d9a46311effb7a488a3267fca9f

Instance Vlans Mapped

0 21 to 4094

1 1 to 10

2 11 to 20

Table 8 Command output

Field	Description
Format selector	Format selector defined by the spanning tree protocol. The default value is 0 and the selector cannot be configured.
Region name	MST region name.
Revision level	Revision level of the MST region, which can be configured by using the revision-level command and defaults to 0.

display stp root

Syntax

display stp root [ | { begin | exclude | include } regular-expression ]

View

Any view

Default level

1: Monitor level

Parameters

|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.

begin: Displays the first line that matches the specified regular expression and all lines that follow.

include: Displays all lines that match the specified regular expression.

regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.

Description

Use display stp root to display the root bridge information of all MSTIs.

Examples

# In MSTP mode, display the root bridge information of all spanning trees.

<Sysname> display stp root

MSTID Root Bridge ID ExtPathCost IntPathCost Root Port

0 0.00e0-fc0e-6554 200200 0 GigabitEthernet1/0/1

Table 9 Command output

Field	Description
ExtPathCost	External path cost. The device automatically calculates the default path cost of a port, or alternatively, you can use the stp cost command to configure the path cost of a port.
IntPathCost	Internal path cost. The device automatically calculates the default path cost of a port, or alternatively, you can use the stp cost command to configure the path cost of a port.
Root Port	Root port name (displayed only if a port of the device is the root port of MSTIs).

display stp tc

Syntax

display stp [ instance instance-id ] tc [ | { begin | exclude | include } regular-expression ]

View

Any view

Default level

0: Visit level

Parameters

instance instance-id: Displays the statistics of TC/TCN BPDUs received and sent by all ports in a particular MSTI. The value of instance-id ranges from 0 to 15, where 0 represents the CIST.

|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.

begin: Displays the first line that matches the specified regular expression and all lines that follow.

include: Displays all lines that match the specified regular expression.

regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.

Description

Use display stp tc to display the statistics of TC/TCN BPDUs received and sent by all ports in an MSTI or all MSTIs.

In STP/RSTP mode, the displayed information is sorted by port name.

In MSTP mode:

· If you do not specify any MSTI, this command displays the statistics of TC/TCN BPDUs received and sent by all ports in all MSTIs. The displayed information is sorted by instance ID and by port name in each MSTI.

· If you specify an MSTI, this command displays the statistics of TC/TCN BPDUs received and sent by all ports in the specified MSTI, in port name order.

Examples

# In MSTP mode, display the statistics of TC/TCN BPDUs received and sent by all ports in MSTI 0.

<Sysname> display stp instance 0 tc

MSTID Port Receive Send

0 GigabitEthernet1/0/1 6 4

0 GigabitEthernet1/0/2 0 2

Table 10 Command output

Field	Description
Port	Port name.
Receive	Number of TC/TCN BPDUs received on each port.
Send	Number of TC/TCN BPDUs sent by each port.

instance

Syntax

instance instance-id vlan vlan-list

undo instance instance-id [ vlan vlan-list ]

View

MST region view

Default level

2: System level

Parameters

instance-id: Specifies an MSTI ID, ranging from 0 to 15, where 0 represents the CIST.

vlan vlan-list: Specifies a VLAN list in the format of vlan-list = { vlan-id [ to vlan-id ] }&<1-10>, in which vlan-id represents the VLAN ID, ranging from 1 to 4094. &<1-10> indicates you can specify up to 10 VLAN IDs or VLAN ID ranges.

Description

Use instance to map a list of VLANs to the specified MSTI.

Use undo instance to remap the specified VLAN or all VLANs to the CIST (MSTI 0).

By default, all VLANs are mapped to the CIST.

If you specify no VLAN in the undo instance command, all VLANs mapped to the specified MSTI will be remapped to the CIST.

You cannot map the same VLAN to different MSTIs. If you map a VLAN that has been mapped to an MSTI to a new MSTI, the old mapping will be automatically removed.

After configuring this command, run the active region-configuration command to activate the VLAN-to-instance mapping.

Related commands: display stp region-configuration, check region-configuration, and active region-configuration.

Examples

# Map VLAN 2 to MSTI 1.

<Sysname> system-view

[Sysname] stp region-configuration

[Sysname-mst-region] instance 1 vlan 2

region-name

Syntax

region-name name

undo region-name

View

MST region view

Default level

2: System level

Parameters

name: Specifies the MST region name, a string of 1 to 32 characters.

Description

Use region-name to configure the MST region name.

Use undo region-name to restore the default MST region name.

By default, the MST region name of a device is its MAC address.

The MST region name, the VLAN-to-instance mapping table, and the MSTP revision level of a device jointly determine the device's MST region.

After configuring this command, run the active region-configuration command to activate the configured MST region name.

Related commands: instance, revision-level, vlan-mapping modulo, display stp region-configuration, check region-configuration, and active region-configuration.

Examples

# Set the MST region name of the device to hello.

<Sysname> system-view

[Sysname] stp region-configuration

[Sysname-mst-region] region-name hello

reset stp

Syntax

reset stp [ interface interface-list ]

View

User view

Default level

1: Monitor level

Parameters

interface interface-list: Clears the MSTP statistics of the ports specified in the format of interface-list = { interface-type interface-number [ to interface-type interface-number ] }&<1-10>, where &<1-10> indicates that you can specify up to 10 ports or port ranges.

Description

Use reset stp to clear the MSTP statistics.

The MSTP statistics includes the numbers of TCN BPDUs, configuration BPDUs, RST BPDUs and MST BPDUs sent/received through the specified ports.

If you specify the interface-list argument, the command clears the spanning tree-related statistics on the specified ports. Without the argument, the command clears the spanning tree-related statistics on all ports.

Related commands: display stp.

Examples

# Clear the spanning tree-related statistics on ports GigabitEthernet 1/0/1 through GigabitEthernet 1/0/3.

<Sysname> reset stp interface gigabitethernet 1/0/1 to gigabitethernet 1/0/3

revision-level

Syntax

revision-level level

undo revision-level

View

MST region view

Default level

2: System level

Parameters

level: Specifies an MSTP revision level, ranging from 0 to 65535.

Description

Use revision-level to configure the MSTP revision level.

Use undo revision-level to restore the default MSTP revision level.

By default, the MSTP revision level is 0.

The MSTP revision level, the MST region name, and the VLAN-to-instance mapping table of a device jointly determine the device's MST region. When the MST region name and VLAN-to-instance mapping table are both the same for two MST regions, they can still be differentiated by their MSTP revision levels.

After configuring this command, run the active region-configuration command to activate the configured MST region level.

Related commands: instance, region-name, vlan-mapping modulo, display stp region-configuration, check region-configuration, and active region-configuration.

Examples

# Set the MSTP revision level of the MST region to 5.

<Sysname> system-view

[Sysname] stp region-configuration

[Sysname-mst-region] revision-level 5

stp bpdu-protection

Syntax

stp bpdu-protection

undo stp bpdu-protection

View

System view

Default level

2: System level

Parameters

None

Description

Use stp bpdu-protection to enable the BPDU guard function.

Use undo stp bpdu-protection to disable the BPDU guard function.

By default, the BPDU guard function is disabled.

Examples

# Enable the BPDU guard function.

<Sysname> system-view

[Sysname] stp bpdu-protection

stp bridge-diameter

Syntax

stp bridge-diameter diameter

undo stp bridge-diameter

View

System view

Default level

2: System level

Parameters

diameter: Specifies the switched network diameter, ranging from 2 to 7.

Description

Use stp bridge-diameter to specify the network diameter, the maximum possible number of stations between any two terminal devices on the switched network.

Use undo stp bridge-diameter to restore the default.

By default, the network diameter of the switched network is 7.

An appropriate setting of hello time, forward delay, and max age can speed up network convergence. The values of these timers are related to the network size and you can set the timers by setting the network diameter. With the network diameter set to 7 (the default), the three timers will be set to their defaults.

Each MST region is considered as a device, and the configured network diameter of the switched network is only effective for the CIST (or the common root bridge), not for MSTIs.

Related commands: stp timer forward-delay, stp timer hello, and stp timer max-age.

Examples

# In MSTP mode, set the network diameter of the switched network to 5.

<Sysname> system-view

[Sysname] stp bridge-diameter 5

stp compliance

Syntax

stp compliance { auto | dot1s | legacy }

undo stp compliance

View

Ethernet interface view, port group view

Default level

2: System level

Parameters

auto: Configures the ports to recognize the MSTP BPDU format automatically and determine the format of MSTP BPDUs to send.

dot1s: Configures the ports to receive and send only standard-format (802.1s-compliant) MSTP BPDUs.

legacy: Configures the ports to receive and send only compatible-format MSTP BPDUs.

Description

Use stp compliance to configure the mode the specified ports will use to recognize and send MSTP BPDUs.

Use undo stp compliance to restore the system default.

By default, a port automatically recognizes the formats of received MSTP packets and determines the formats of MSTP packets to be sent based on the recognized formats.

Configured in Ethernet interface view, the setting takes effect on the interface only.

Configured in port group view, the setting takes effect on all ports in the port group.

Examples

# Configure GigabitEthernet 1/0/1 to receive and send only standard-format (802.1s) MSTP packets.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] stp compliance dot1s

stp config-digest-snooping

Syntax

stp config-digest-snooping

undo stp config-digest-snooping

View

System view, Ethernet interface view, port group view

Default level

2: System level

Parameters

None

Description

Use stp config-digest-snooping to enable Digest Snooping.

Use undo stp config-digest-snooping to disable Digest Snooping.

The feature is disabled by default.

Configured in system view, the setting takes effect globally.

Configured in Ethernet interface view, the setting takes effect on the interface only.

Configured in port group view, the setting takes effect on all ports in the port group.

Enable this feature both globally and on ports connected to other vendors' devices to make it effective. To minimize impact, enable the feature on all associated ports before you enable it globally.

Related commands: display stp.

Examples

# Enable Digest Snooping on GigabitEthernet 1/0/1 and then globally.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] stp config-digest-snooping

[Sysname-GigabitEthernet1/0/1] quit

[Sysname] stp config-digest-snooping

stp cost

Syntax

stp [ instance instance-id ] cost cost

undo stp [ instance instance-id ] cost

View

Ethernet interface view, port group view

Default level

2: System level

Parameters

instance instance-id: Sets the path cost of the ports in a particular MSTI. The value of instance-id ranges from 0 to 15, where 0 represents the CIST.

cost: Specifies the path cost of the port, with an effective range that depends on the path cost calculation standard adopted.

· With the IEEE 802.1d-1998 standard selected for path cost calculation, the cost argument ranges from 1 to 65535.

· With the IEEE 802.1t standard selected for path cost calculation, the cost argument ranges from 1 to 200000000.

· With the private standard selected for path cost calculation, the cost argument ranges from 1 to 200000.

Description

Use stp cost to set the path cost of the port or ports.

Use undo stp cost to restore the system default.

By default, the device automatically calculates the path costs of ports in each spanning tree based on the corresponding standard.

Configured in Ethernet interface view, the setting takes effect on the interface only.

Configured in port group view, the setting takes effect on all ports in the port group.

Path cost is an important factor in spanning tree calculation. Setting different path costs for a port in MSTIs allows VLAN traffic flows to be forwarded along different physical links, achieving VLAN-based load balancing.

The path cost setting of a port can affect the role selection of the port. When the path cost of a port is changed, the system will re-calculate the role of the port and initiate a state transition.

Related commands: display stp and stp pathcost-standard.

Examples

# In MSTP mode, set the path cost of port GigabitEthernet 1/0/3 in MSTI 2 to 200.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/3

[Sysname-GigabitEthernet1/0/3] stp instance 2 cost 200

stp edged-port

Syntax

stp edged-port { enable | disable }

undo stp edged-port

View

Ethernet interface view, port group view

Default level

2: System level

Parameters

enable: Configures the current port as an edge port.

disable: Configures the current port as a non-edge port.

Description

Use stp edged-port enable to configure the ports as an edge port or ports.

Use stp edged-port disable to configure the ports as a non-edge port or non-edge ports.

Use undo stp edged-port to restore the default.

By default, all ports are non-edge ports.

Configured in Ethernet interface view, the setting takes effect on the interface only.

Configured in port group view, the setting takes effect on all ports in the port group.

If a port directly connects to a user terminal rather than another device or a shared LAN segment, this port is regarded as an edge port. When the network topology changes, an edge port will not cause a temporary loop. You can enable the port to transition to the forwarding state rapidly by configuring it as an edge port. H3C recommends you to configure ports directly connecting to user terminals as edge ports.

Configuration BPDUs from other devices usually cannot reach an edge port, because the edge port does not connect to any other device. If a port receives a configuration BPDU when the BPDU guard function is disabled, the port functions as a non-edge port, even if you configure it as an edge port.

Among loop guard, root guard and edge port settings, only one function (whichever is configured the earliest) takes effect on a port at the same time.

Related commands: stp loop-protection and stp root-protection.

Examples

# Configure GigabitEthernet 1/0/1 as an edge port.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] stp edged-port enable

stp enable

Syntax

stp enable

undo stp enable

View

System view, Ethernet interface view, port group view

Default level

2: System level

Parameters

None

Description

Use stp enable to enable the spanning tree feature globally.

Use undo stp enable to disable the spanning tree feature.

Configured in system view, the setting takes effect globally.

Configured in Ethernet interface view, the setting takes effect on the interface only.

Configured in port group view, the setting takes effect on all ports in the port group.

When you enable the spanning tree feature, the device operates in STP-compatible, RSTP, or MSTP mode, depending on the spanning tree mode setting.

When the spanning tree feature is enabled, the device dynamically maintains the spanning tree status of VLANs based on received configuration BPDUs. When the spanning tree feature is disabled, the device stops maintaining the spanning tree status.

Related commands: stp mode.

Examples

# In MSTP mode, enable the spanning tree feature globally.

<Sysname> system-view

[Sysname] stp enable

# In MSTP mode, disable the spanning tree feature on port GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] undo stp enable

stp loop-protection

Syntax

stp loop-protection

undo stp loop-protection

View

Ethernet interface view, port group view

Default level

2: System level

Parameters

None

Description

Use stp loop-protection to enable the loop guard function on the ports.

Use undo stp loop-protection to restore the system default.

By default, the loop guard function is disabled.

Configured in Ethernet interface view, the setting takes effect on the interface only.

Configured in port group view, the setting takes effect on all ports in the port group.

Among loop guard, root guard and edge port settings, only one function (whichever is configured the earliest) takes effect on a port at the same time.

Related commands: stp edged-port and stp root-protection.

Examples

# Enable the loop guard function on GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] stp loop-protection

stp max-hops

Syntax

stp max-hops hops

undo stp max-hops

View

System view

Default level

2: System level

Parameters

hops: Sets the maximum hops, ranging from 1 to 40.

Description

Use stp max-hops to set the maximum hops of the MST region on the device.

Use undo stp max-hops to restore the maximum hops to the default setting.

By default, the maximum number of hops of an MST region is 20.

Setting the maximum hops of MST regions is to limit the sizes of MST regions.

Related commands: display stp.

Examples

# Set the maximum hops of the MST region on the device to 35.

<Sysname> system-view

[Sysname] stp max-hops 35

stp mcheck

Syntax

stp mcheck

View

System view, Ethernet interface view

Default level

2: System level

Parameters

None

Description

Use stp mcheck to perform the mCheck operation globally or on a port.

If a port on a device running MSTP or RSTP mode connects to an STP device, this port will automatically transition to the STP-compatible mode. However, it cannot automatically transition back to the original mode when:

· The STP device is shut down or removed.

· The STP device transitions to the MSTP or RSTP mode.

Then, you can perform an mCheck operation to forcibly transition the port to operation in the original mode.

The device operates in STP-compatible, RSTP, or MSTP mode depending on the spanning tree mode setting.

The stp mcheck command is effective only when the device operates in MSTP or RSTP mode.

Configured in system view, the setting takes effect globally.

Configured in Ethernet interface view, the setting takes effect on the interface only.

Related commands: stp mode.

Examples

# Perform mCheck on GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] stp mcheck

stp mode

Syntax

stp mode { stp | rstp | mstp }

undo stp mode

View

System view

Default level

2: System level

Parameters

stp: Configures the spanning tree device to operate in STP-compatible mode.

rstp: Configures the spanning tree device to operate in RSTP mode.

mstp: Configures the spanning tree device to operate in MSTP mode.

Description

Use stp mode to configure the spanning tree operating mode of the device.

Use undo stp mode to restore the default.

By default, a spanning tree device operates in MSTP mode.

Related commands: stp mcheck and stp enable.

Examples

# Configure the spanning tree device to operate in STP-compatible mode.

<Sysname> system-view

[Sysname] stp mode stp

stp no-agreement-check

Syntax

stp no-agreement-check

undo stp no-agreement-check

View

Ethernet interface view, port group view

Default level

2: System level

Parameters

None

Description

Use stp no-agreement-check to enable No Agreement Check on the ports.

Use undo stp no-agreement-check to disable No Agreement Check on the ports.

By default, No Agreement Check is disabled.

Configured in Ethernet interface view, the setting takes effect on the interface only.

Configured in port group view, the setting takes effect on all member ports in the port group.

This feature takes effect only after you enable it on the root port.

Examples

# Enable No Agreement Check on GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] stp no-agreement-check

stp pathcost-standard

Syntax

stp pathcost-standard { dot1d-1998 | dot1t | legacy }

undo stp pathcost-standard

View

System view

Default level

2: System level

Parameters

dot1d-1998: Configures the device to calculate the default path cost for ports based on IEEE 802.1d-1998.

dot1t: Configures the device to calculate the default path cost for ports based on IEEE 802.1t.

legacy: Configures the device to calculate the default path cost for ports based on a private standard.

Description

Use stp pathcost-standard to specify a standard for the device to use when calculating the default path costs for ports of the device.

Use undo stp pathcost-standard to restore the system default.

By default, the device calculates the default path cost for ports based on IEEE 802.1t.

If you change the standard that the device uses in calculating the default path costs, you restore the path costs to the default.

Related commands: stp cost and display stp.

Examples

# Configure the device to calculate the default path cost for ports based on IEEE 802.1d-1998.

<Sysname> system-view

[Sysname] stp pathcost-standard dot1d-1998

stp point-to-point

Syntax

stp point-to-point { auto | force-false | force-true }

undo stp point-to-point

View

Ethernet interface view, port group view

Default level

2: System level

Parameters

auto: Specifies automatic detection of the link type.

force-false: Specifies the non-point-to-point link type.

force-true: Specifies the point-to-point link type.

Description

Use stp point-to-point to configure the link type of the current ports.

Use undo stp point-to-point to restore the system default.

The default setting is auto and the spanning tree device automatically detects whether a port connects to a point-to-point link.

Configured in Ethernet interface view, the setting takes effect on the interface only.

Configured in port group view, the setting takes effect on all member ports in the port group.

When connecting to a non-point-to-point link, a port is incapable of rapid state transition.

If the physical link to which the port connects is not a point-to-point link but you set it to be one, your configuration may bring a temporary loop.

Related commands: display stp.

Examples

# Configure the link connecting GigabitEthernet 1/0/3 as a point-to-point link.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/3

[Sysname-GigabitEthernet1/0/3] stp point-to-point force-true

stp port priority

Syntax

stp [ instance instance-id ] port priority priority

undo stp [ instance instance-id ] port priority

View

Ethernet interface view, port group view

Default level

2: System level

Parameters

instance instance-id: Sets the priority of the current ports in a particular MSTI. The value of instance-id ranges from 0 to 15, where 0 represents the CIST.

priority: Specifies a port priority, ranging from 0 to 240 in steps of 16 (0, 16, 32…, for example).

Description

Use stp port priority to set the priority of the ports.

Use undo stp port priority to restore the system default.

Port priority affects the role of a port in a spanning tree.

By default, the port priority is 128.

Configured in Ethernet interface view, the setting takes effect on the interface only.

Configured in port group view, the setting takes effect on all ports in the port group.

To set the priority of an MSTP port in a specific MSTI, use this command with the MSTI specified. To set the priority of an MSTP port in the CIST or an STP/RSTP port, use this command without specifying any MSTI.

The smaller the value, the higher the port priority. If all ports on your device use the same priority value, the port priority depends on the port index. The smaller the index, the higher the priority.

Related commands: display stp.

Examples

# In MSTP mode, set the priority of port GigabitEthernet 1/0/3 to 16 in MSTI 2.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/3

[Sysname-GigabitEthernet1/0/3] stp instance 2 port priority 16

stp port-log

Syntax

stp port-log { instance instance-id | all }

undo stp port-log { instance instance-id }

View

System view

Default level

2: System level

Parameters

instance instance-id: Specifies an MSTI. The value of instance-id ranges from 0 to 15, where 0 represents the CIST.

all: Specifies all MSTIs.

Description

Use stp port-log to enable outputting port state transition information for the specified MSTI or all MSTIs.

Use undo stp port-log to disable outputting port state transition information for the specified MSTI or all MSTIs.

By default, outputting port state transition information is enabled.

Examples

# In MSTP mode, enable outputting port state transition information for MSTI 2.

<Sysname> system-view

[Sysname] stp port-log instance 2

%Aug 16 00:49:41:856 2010 Sysname MSTP/3/PDISC: Instance 2's GigabitEthernet1/0/1 has been set to discarding state!

%Aug 16 00:49:41:856 2010 Sysname MSTP/3/PFWD: Instance 2's GigabitEthernet1/0/2 has been set to forwarding state!

The output shows that GigabitEthernet 1/0/1 in MSTI 2 transitioned to the discarding state and GigabitEthernet 1/0/2 in MSTI 2 transitioned to the forwarding state.

stp priority

Syntax

stp [ instance instance-id ] priority priority

undo stp [ instance instance-id ] priority

View

System view

Default level

2: System level

Parameters

instance instance-id: Sets the priority of the device in a MSTI. The value of instance-id ranges from 0 to 15, where 0 represents the CIST.

priority: Specifies a device priority, ranging from 0 to 61440 in steps of 4096. You can set up to 16 priority values, such as 0, 4096, 8192…, on the device. The smaller the value, the higher the device priority.

Description

Use stp priority to set the priority of the device.

Use undo stp priority to restore the default priority.

By default, the device priority is 32768.

To set the priority of an MSTP device in a specific MSTI, use this command with the MSTI specified. To set the priority of an MSTP device in the CIST or an STP/RSTP device, use this command without specifying any MSTI.

Examples

# In MSTP mode, set the device priority to 4096 in MSTI 1.

<Sysname> system-view

[Sysname] stp instance 1 priority 4096

stp region-configuration

Syntax

stp region-configuration

undo stp region-configuration

View

System view

Default level

2: System level

Parameters

None

Description

Use stp region-configuration to enter MST region view.

Use undo stp region-configuration to restore the default MST region configurations.

These are the default settings for the MST region:

· The MST region name of the device is the MAC address of the device.

· All VLANs are mapped to the CIST.

· The MSTP revision level is 0.

After you enter MST region view, you can configure the MST region-related parameters, including the region name, VLAN-to-instance mappings, and revision level.

Examples

# Enter MST region view.

<Sysname> system-view

[Sysname] stp region-configuration

[Sysname-mst-region]

stp root primary

Syntax

stp [ instance instance-id ] root primary

undo stp [ instance instance-id ] root

View

System view

Default level

2: System level

Parameters

instance instance-id: Configures the device as the root bridge in a particular MSTI. The value of instance-id ranges from 0 to 15, where 0 represents the CIST.

Description

Use stp root primary to configure the current device as the root bridge.

Use undo stp root to restore the system default.

By default, a device is not a root bridge.

To set an MSTP device as the root bridge in a specific MSTI, use this command with the MSTI specified. To set an MSTP device in the CIST or an STP/RSTP device as the root bridge, use this command without specifying any MSTI.

Once you specify the device as the root bridge, you cannot change the priority of the device.

Related commands: stp priority and stp root secondary.

Examples

# In MSTP mode, specify the current device as the root bridge of MSTI 1.

<Sysname> system-view

[Sysname] stp instance 1 root primary

stp root secondary

Syntax

stp [ instance instance-id ] root secondary

undo stp [ instance instance-id ] root

View

System view

Default level

2: System level

Parameters

instance instance-id: Configures the device as a secondary root bridge in a particular MSTI. The value of instance-id ranges from 0 to 15, where 0 represents the CIST.

Description

Use stp root secondary to configure the device as a secondary root bridge.

Use undo stp root to restore the system default.

By default, a device is not a secondary root bridge.

To set an MSTP device as a secondary root bridge in a specific MSTI, use this command with the MSTI specified. To set an MSTP device in the CIST or an STP/RSTP device as a secondary root bridge, use this command without specifying any MSTI.

Once you specify the device as a secondary root bridge, you cannot change the priority of the device.

Related commands: stp priority and stp root primary.

Examples

# In MSTP mode, specify the current device as a secondary root bridge in MSTI 1.

<Sysname> system-view

[Sysname] stp instance 1 root secondary

stp root-protection

Syntax

stp root-protection

undo stp root-protection

View

Ethernet interface view, port group view

Default level

2: System level

Parameters

None

Description

Use stp root-protection to enable the root guard function on the ports.

Use undo stp root-protection to restore the default.

By default, the root guard function is disabled.

Configured in Ethernet interface view, the setting takes effect on the interface only.

Configured in port group view, the setting takes effect on all ports in the port group.

Among loop guard, root guard and edge port settings, only one function (whichever is configured the earliest) takes effect on a port at the same time.

Related commands: stp edged-port and stp loop-protection.

Examples

# Enable the root guard function for GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] stp root-protection

stp tc-protection

Syntax

stp tc-protection enable

stp tc-protection disable

View

System view

Default level

2: System level

Parameters

None

Description

Use stp tc-protection enable to enable the TC-BPDU attack guard function for the device.

Use stp tc-protection disable to disable the TC-BPDU attack guard function for the device.

By default, the TC-BPDU attack guard function is enabled.

Examples

# Disable the TC-BPDU attack guard function for the device.

<Sysname> system-view

[Sysname] stp tc-protection disable

stp tc-protection threshold

Syntax

stp tc-protection threshold number

undo stp tc-protection threshold

View

System view

Default level

2: System level

Parameters

number: Sets the maximum number of immediate forwarding address entry flushes that the device can perform within a certain period of time (10 seconds). The value ranges from 1 to 255.

Description

Use stp tc-protection threshold to configure the maximum number of forwarding address entry flushes that the device can perform every a certain period of time (10 seconds).

Use undo stp tc-protection threshold to restore the default.

By default, the device can perform a maximum of six forwarding address entry flushes every 10 seconds.

Examples

# Configure the device to perform up to 10 forwarding address entry flushes every 10 seconds.

<Sysname> system-view

[Sysname] stp tc-protection threshold 10

stp timer forward-delay

Syntax

stp timer forward-delay time

undo stp timer forward-delay

View

System view

Default level

2: System level

Parameters

time: Sets the forward delay in centiseconds, ranging from 400 to 3000 in steps of 100.

Description

Use stp timer forward-delay to set the forward delay timer of the device.

Use undo stp timer forward-delay to restore the system default.

By default, the forward delay timer is 1500 centiseconds.

The forward delay timer determines the time interval of state transition. To prevent temporary loops, a spanning tree port must go through the learning (intermediate) state before it transitions from the discarding to the forwarding state. To stay synchronized with the remote device, the port has a wait period between transition states that is determined by the forward delay timer.

H3C does not recommend you to set the forward delay with this command. Instead, you can specify the network diameter of the switched network by using the stp bridge-diameter command and let spanning tree protocols automatically calculate optimal settings of the forward delay timer. If the network diameter uses the default value, the forward delay timer also uses the default value.

Related commands: stp timer hello, stp timer max-age, and stp bridge-diameter.

Examples

# In MSTP mode, set the forward delay timer to 2000 centiseconds.

<Sysname> system-view

[Sysname] stp timer forward-delay 2000

stp timer hello

Syntax

stp timer hello time

undo stp timer hello

View

System view

Default level

2: System level

Parameters

time: Sets the hello time in centiseconds, ranging from 100 to 1000 in steps of 100.

Description

Use stp timer hello to set the hello time of the device.

Use undo stp timer hello to restore the system default.

By default, the hello time is 200 centiseconds.

Hello time is the time interval at which spanning tree devices send configuration BPDUs to maintain spanning tree. If a device fails to receive configuration BPDUs within the set period of time, a new spanning tree calculation process will be triggered due to timeout.

H3C does not recommend you to set the hello time with this command. Instead, you can specify the network diameter of the switched network by using the stp bridge-diameter command and let spanning tree protocols automatically calculate optimal settings of the hello timer. If the network diameter uses the default value, the hello timer also uses the default value.

Related commands: stp timer forward-delay, stp timer max-age, and stp bridge-diameter.

Examples

# In MSTP mode, set the hello time to 400 centiseconds.

<Sysname> system-view

[Sysname] stp timer hello 400

stp timer max-age

Syntax

stp timer max-age time

undo stp timer max-age

View

System view

Default level

2: System level

Parameters

time: Sets the max age in centiseconds, ranging from 600 to 4000 in steps of 100.

Description

Use stp timer max-age to set the max age timer of the device.

Use undo stp timer max-age to restore the system default.

By default, the max age is 2000 centiseconds.

In the CIST of an MSTP network, the device determines whether a configuration BPDU received on a port has expired based on the max age timer. If yes, a new spanning tree calculation process starts. The max age timer is ineffective for MSTIs.

H3C does not recommend you to set the max age timer with this command. Instead, you can specify the network diameter of the switched network by using the stp bridge-diameter command and let spanning tree protocols automatically calculate optimal settings of the max age timer. If the network diameter uses the default value, the max age timer also uses the default value.

Related commands: stp timer forward-delay, stp timer hello, and stp bridge-diameter.

Examples

# In MSTP mode, set the max age timer to 1000 centiseconds.

<Sysname> system-view

[Sysname] stp timer max-age 1000

stp timer-factor

Syntax

stp timer-factor factor

undo stp timer-factor

View

System view

Default level

2: System level

Parameters

factor: Sets the timeout factor, ranging from 1 to 20.

Description

Use stp timer-factor to set the timeout factor, which decides the timeout time.

Timeout time = timeout factor × 3 × hello time.

Use undo stp timer-factor to restore the default.

By default, the timeout factor is 3.

After the network topology is stabilized, each non-root-bridge device forwards configuration BPDUs to the surrounding devices at the interval of hello time to check whether any link is faulty. If a device does not receive a BPDU from the upstream device within nine times the hello time, it will assume that the upstream device has failed and start a new spanning tree calculation process.

In a stable network, this kind of spanning tree calculation may occur because the upstream device is busy. You can avoid such unwanted spanning tree calculations by lengthening the timeout time, saving the network resources. H3C recommends you to set the timeout factor to 5, or 6, or 7 for a stable network.

Related commands: stp timer hello.

Examples

# Set the timeout factor of the device to 7.

<Sysname> system-view

[Sysname] stp timer-factor 7

stp transmit-limit

Syntax

stp transmit-limit limit

undo stp transmit-limit

View

Ethernet interface view, port group view

Default level

2: System level

Parameters

limit: Sets the maximum number of BPDUs the ports can send within each hello time, ranging from 1 to 255.

Description

Use stp transmit-limit to set the maximum transmission rate of the ports, which specifies the maximum number of BPDUs the ports can send within each hello time.

Use undo stp transmit-limit to restore the system default.

By default, the maximum transmission rate of all ports of the device is 10. Each port can send up to 10 BPDUs within each hello time.

Configured in Ethernet interface view, the setting takes effect on the interface only.

Configured in port group view, the setting takes effect on all member ports in the port group.

A larger maximum transmission rate value requires more system resources. An appropriate maximum transmission rate setting can limit the speed at which a port sends BPDUs and prevent spanning tree protocols from using excessive bandwidth resources during network topology changes. H3C recommends you to use the default value.

Examples

# Set the maximum transmission rate of port GigabitEthernet 1/0/1 to 5.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] stp transmit-limit 5

vlan-mapping modulo

Syntax

vlan-mapping modulo modulo

View

MST region view

Default level

2: System level

Parameters

modulo: Sets the modulo value, ranging from 1 to 15.

Description

Use vlan-mapping modulo to map VLANs in the current MST region to MSTIs according to the specified modulo value, quickly creating a VLAN-to-instance mapping table.

By default, all VLANs are mapped to the CIST (MSTI 0).

You cannot map the same VLAN to different MSTIs. If you map a VLAN that has been mapped to an MSTI to a new MSTI, the old mapping will be automatically removed.

This command maps each VLAN to the MSTI whose ID is (VLAN ID – 1) %modulo + 1, where (VLAN ID – 1) %modulo is the modulo operation for (VLAN ID – 1). If the modulo value is 15, for example, then VLAN 1 will be mapped to MSTI 1, VLAN 2 to MSTI 2, VLAN 15 to MSTI 15, VLAN 16 to MSTI 1, and so on.

Related commands: region-name, revision-level, display stp region-configuration, check region-configuration, and active region-configuration.

Examples

# Map VLANs to MSTIs as per modulo 8.

<Sysname> system-view

[Sysname] stp region-configuration

[Sysname-mst-region] vlan-mapping modulo 8

03-Layer 2 Command Reference

check region-configuration

display stp root

region-name

reset stp

revision-level

stp bpdu-protection

stp bridge-diameter

stp mcheck

stp mode

stp port priority

stp region-configuration

stp tc-protection threshold

stp timer hello

stp timer max-age

vlan-mapping modulo

Intelligent Terminal Products

Product Support Services

Technical Service Solutions

Resource Center

Policy

Online Help

Become a Partner

Partner Policy & Program

Global Learning

Partner Sales Resources

Service Business

News & Events

Contact Us