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| Title | Size | Download |
|---|---|---|
| 06-Spanning Tree Commands | 273.64 KB |
The term "switch" or "device" in this chapter refers to the switching engine on a WX3000E wireless switch.
The WX3000E series comprises WX3024E and WX3010E wireless switches.
The port numbers in this chapter are for illustration only.
active region-configuration
Syntax
active region-configuration
View
MST region view
Default level
2: System level
Parameters
None
Description
Use the active region-configuration command to activate your MST region configuration.
When you configure MST region–related parameters, MSTP launches a new spanning tree calculation process that may cause network topology instability. This is most likely to occur when you configure the VLAN-to-instance mapping table. The launch will occur only after the MST region–related parameters are activated with the active region-configuration command, or you enable the spanning tree feature with the stp enable command.
H3C recommends you to use the check region-configuration command to determine whether the MST region configurations to be activated are correct. Run this command only when 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
bpdu-drop any
Syntax
bpdu-drop any
undo bpdu-drop any
View
Ethernet interface view
Default level
2: System level
Parameters
None
Description
Use the bpdu-drop any command to enable BPDU drop on a port.
Use the undo bpdu-drop any command to disable BPDU drop on a port.
By default, BPDU drop is disabled on a port.
Examples
# Enable BPDU drop on port GigabitEthernet 1/0/1.
<Sysname> system-view
[Sysname] interface gigabitethernet 1/0/1
[Sysname-GigabitEthernet1/0/1] bpdu-drop any
check region-configuration
Syntax
check region-configuration
View
MST region view
Default level
2: System level
Parameters
None
Description
Use the check region-configuration command 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 if 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. Activate them only when 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 Output description
|
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 | slot slot-number ] [ 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 instance-id argument specifies a MSTI ID, and ranges from 0 to 15. MSTI 0 is the 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.
slot slot-number: Displays the spanning tree status and statistics of the specified device. slot-number is 1 and specifies the slot number of the device.
brief: Displays brief spanning tree status and statistics.
|: Filters command output by specifying a regular expression. For more information about regular expressions, see the Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
exclude: Displays all lines that do not match the specified regular expression.
include: Displays all lines that match the specified regular expression.
regular-expression: Specifies a regular expression, which is a case sensitive string of 1 to 256 characters.
Description
Use the display stp command 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.
· 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 the following parameters:
· CIST global parameters:
¡ Protocol work 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
¡ Internal path cost from the device to the regional root
¡ CIST root port of the device
¡ 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
¡ 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
¡ Master bridge
· MSTI port parameters:
¡ Port status
¡ Role
¡ Priority
¡ Path cost
¡ Designated bridge
¡ Designated port
¡ Remaining hops
¡ Status of rapid state transition (enabled or disabled) for designated ports
The statistics include the following items:
· 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
# Display the brief spanning tree status and statistics of MSTI 0 on ports GigabitEthernet 1/0/1 through GigabitEthernet1/0/4.
<Sysname> display stp instance 0 interface gigabitethernet 1/0/1 to gigabitethernet 1/0/4 brief
MSTID Port Role STP State Protection
0 GigabitEthernet1/0/1 ALTE DISCARDING LOOP
0 GigabitEthernet1/0/2 DESI FORWARDING NONE
0 GigabitEthernet1/0/3 DESI FORWARDING NONE
0 GigabitEthernet1/0/4 DESI FORWARDING NONE
Table 2 display stp brief command output description
|
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—Learn MAC addresses, and also forward user traffic. · DISCARDING—Not learn MAC addresses, but cannot forward user traffic. · LEARNING—Learn MAC addresses, and do not forward user traffic. |
|
Protection |
Protection type on the port: · ROOT—Root guard. · LOOP—Loop guard. · BPDU—BPDU guard. · NONE—No protection. |
# 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(GigabitEthernet1/0/1)][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
CIST 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 display stp command output description
|
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 information “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 or VLAN. |
|
Time since last TC |
Time since the latest topology change in the MSTI or VLAN. |
|
[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—Configured value. · Active—Actual value. |
|
Point-to-point |
The port is connected to a point-to-point link or not. · Config—Configured value. · Active—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 or VLAN. |
|
Num of Vlans Mapped |
The number of VLANs mapped to the 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. |
|
CIST Bridge-Prio. |
In MSTP mode, this field indicates the device’s priority in the CIST. |
|
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 the Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
exclude: Displays all lines that do not match the specified regular expression.
include: Displays all lines that match the specified regular expression.
regular-expression: Specifies a regular expression, which is a case sensitive string of 1 to 256 characters.
Description
Use the display stp abnormal-port command 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 Output description
|
Field |
Description |
|
Blocked Port |
Name of a blocked port, which corresponds to the related MSTI or VLAN. |
|
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. |
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 instance-id argument specifies a MSTI ID, and ranges from 0 to 15. MSTI 0 is the CIST.
|: Filters command output by specifying a regular expression. For more information about regular expressions, see the Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
exclude: Displays all lines that do not match the specified regular expression.
include: Displays all lines that match the specified regular expression.
regular-expression: Specifies a regular expression, which is a case sensitive string of 1 to 256 characters.
Description
Use the display stp bpdu-statistics command to display the BPDU statistics on ports.
· 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.
Examples
# 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 Output description
|
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 the Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
exclude: Displays all lines that do not match the specified regular expression.
include: Displays all lines that match the specified regular expression.
regular-expression: Specifies a regular expression, which is a case sensitive string of 1 to 256 characters.
Description
Use the display stp down-port command 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 Output description
|
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 | vlan vlan-id ] history [ slot slot-number ] [ | { 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 instance-id argument specifies a MSTI ID, and ranges from 0 to 15. MSTI 0 is the CIST.
slot slot-number: Displays the historical port role calculation information of the specified device. slot-number is 1 and specifies the slot number of the device.
|: Filters command output by specifying a regular expression. For more information about regular expressions, see the Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
exclude: Displays all lines that do not match the specified regular expression.
include: Displays all lines that match the specified regular expression.
regular-expression: Specifies a regular expression, which is a case sensitive string of 1 to 256 characters.
Description
Use the display stp history command to display the historical port role calculation information of the specified MSTI or all MSTIs.
· 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 of the card on slot 1 in MSTI 2.
<Sysname> display stp instance 2 history slot 1
--------------- STP slot 1 history trace ---------------
------------------- 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 Output description
|
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 ignored-vlan
Syntax
display stp ignored-vlan [ | { 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 the Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
exclude: Displays all lines that do not match the specified regular expression.
include: Displays all lines that match the specified regular expression.
regular-expression: Specifies a regular expression, which is a case sensitive string of 1 to 256 characters.
Description
Use the display stp ignored-vlan command to display VLAN Ignore-enabled VLANs.
Examples
# Display VLAN Ignore-enabled VLANs.
<Sysname> display stp ignored-vlan
STP-Ignored VLAN: 1 to 2
Table 8 Output description
|
Field |
Description |
|
STP-Ignored VLAN |
List of VLAN Ignore-enabled VLANs. A value of NONE for this field indicates that no VLAN is enabled with the VLAN Ignore feature. |
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 the Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
exclude: Displays all lines that do not match the specified regular expression.
include: Displays all lines that match the specified regular expression.
regular-expression: Specifies a regular expression, which is a case sensitive string of 1 to 256 characters.
Description
Use the display stp region-configuration command 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
# 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 9 Output description
|
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 the Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
exclude: Displays all lines that do not match the specified regular expression.
include: Displays all lines that match the specified regular expression.
regular-expression: Specifies a regular expression, which is a case sensitive string of 1 to 256 characters.
Description
Use the display stp root command to display the root bridge information of all MSTIs.
Examples
# 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 10 Output description
|
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 [ slot slot-number ] [ | { 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 instance-id argument specifies a MSTI ID, and ranges from 0 to 15. MSTI 0 is the CIST.
slot slot-number: Displays the statistics of TC/TCN BPDUs received and sent by the specified device. slot-number is 1, and specifies the slot number of the device.
|: Filters command output by specifying a regular expression. For more information about regular expressions, see the Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
exclude: Displays all lines that do not match the specified regular expression.
include: Displays all lines that match the specified regular expression.
regular-expression: Specifies a regular expression, which is a case sensitive string of 1 to 256 characters.
Description
Use the display stp tc command to display the statistics of TC/TCN BPDUs received and sent by all ports in an MSTI or all MSTIs.
· 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
# Display the statistics of TC/TCN BPDUs received and sent by all ports on the card on slot 1 in MSTI 0.
<Sysname> display stp instance 0 tc slot 1
-------------- STP slot 1 TC or TCN count -------------
MSTID Port Receive Send
0 GigabitEthernet1/0/1 6 4
0 GigabitEthernet1/0/2 0 2
Table 11 Output description
|
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, which ranges from 0 to 15. MSTI 0 is CIST.
vlan vlan-list: Specifies a VLAN list in the format of vlan-list = { vlan-id [ to vlan-id ] }&<1-10>, where the vlan-id argument represents the VLAN ID, ranges from 1 to 4094, and &<1-10> indicates that you can specify up to 10 VLAN IDs or VLAN ID ranges.
Description
Use the instance command to map a list of VLANs to the specified MSTI.
Use the undo instance command 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 the region-name command to configure the MST region name.
Use the undo region-name command 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 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 the reset stp command 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 the revision-level command to configure the MSTP revision level.
Use the undo revision-level command 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 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 the stp bpdu-protection command to enable the BPDU guard function.
Use the undo stp bpdu-protection command 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 the stp bridge-diameter command to specify the network diameter, the maximum possible number of stations between any two terminal devices on the switched network.
Use the undo stp bridge-diameter command 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
# 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, aggregate interface 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 the stp compliance command to configure the mode the specified ports will use to recognize and send MSTP BPDUs.
Use the undo stp compliance command to restore the 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 that interface only.
Configured in port group view, the setting takes effect on all ports in the port group.
Configured in aggregate interface view, the setting takes effect only on the aggregate interface.
Configured on a member port in an aggregation group, the setting takes effect only after the port leaves the aggregation 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, aggregate interface view
Default level
2: System level
Parameters
None
Description
Use the stp config-digest-snooping command to enable Digest Snooping.
Use the undo stp config-digest-snooping command 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.
Configured in aggregate interface view, the setting takes effect only on the aggregate interface.
Configured on a member port in an aggregation group, the setting takes effect only after the port leaves the aggregation 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, aggregate interface view
Default level
2: System level
Parameters
instance instance-id: Sets the path cost of the ports in a particular MSTI. The instance-id argument specifies a MSTI ID, and ranges from 0 to 15. MSTI 0 is 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 the stp cost command to set the path cost of the port or ports.
Use the undo stp cost command to restore the 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.
Configured in aggregate interface view, the setting takes effect only on the aggregate interface. Configured on a member port in an aggregation group, the setting takes effect only after the port leaves the aggregation 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, aggregate interface view
Default level
2: System level
Parameters
enable: Configures the ports as edge ports.
disable: Configures the ports as non-edge ports.
Description
Use the stp edged-port enable command to configure the ports as edge ports.
Use the stp edged-port disable command to configure the ports as non-edge ports.
Use the undo stp edged-port command 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.
Configured in aggregate interface view, the setting takes effect only on the aggregate interface.
Configured on a member port in an aggregation group, the setting takes effect only after the port leaves the aggregation 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.
You cannot configure edge port settings and loop guard on a port at the same time.
Related commands: stp loop-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, aggregate interface view
Default level
2: System level
Parameters
None
Description
Use the stp enable command to enable the spanning tree feature.
Use the undo stp enable command to disable the spanning tree feature.
By default, the spanning tree feature is disabled globally, and enabled on each port. After you enable the spanning tree feature globally, the spanning tree feature takes effect on each port.
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.
Configured in aggregate interface view, the setting takes effect only on the aggregate interface.
Configured on a member port in an aggregation group, the setting takes effect only after the port leaves the aggregation group.
When you enable the spanning tree feature, the device works 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
# Enable the spanning tree feature globally.
<Sysname> system-view
[Sysname] stp enable
# 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 ignored vlan
Syntax
stp ignored vlan vlan-list
undo stp ignored vlan vlan-list
View
System view
Default level
2: System level
Parameters
vlan vlan-list: Specifies a VLAN list in the format of vlan-list = { vlan-id [ to vlan-id ] }&<1-10>, where the vlan-id argument represents the VLAN ID, ranges from 1 to 4094, and &<1-10> indicates that you can specify up to 10 VLAN IDs or VLAN ID ranges.
Description
Use the stp ignored vlan command to enable VLAN Ignore for the specified VLANs.
Use the undo stp ignored vlan command to disable VLAN Ignore for the specified VLANs.
By default, VLAN Ignore is disabled for a VLAN.
Related commands: display stp ignored-vlan.
Examples
# Enable VLAN Ignore for VLAN 1 through VLAN 10.
<Sysname> system-view
[Sysname] stp ignored vlan 1 to 10
stp loop-protection
Syntax
stp loop-protection
undo stp loop-protection
View
Ethernet interface view, port group view, aggregate interface view
Default level
2: System level
Parameters
None
Description
Use the stp loop-protection command to enable the loop guard function on the ports.
Use the undo stp loop-protection command to restore the 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.
Configured in aggregate interface view, the setting takes effect only on the aggregate interface.
Configured on a member port in an aggregation group, the setting takes effect only after the port leaves the aggregation group.
You cannot configure edge port settings and loop guard, or configure root guard and loop guard 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 the stp max-hops command to set the maximum hops of the MST region.
Use the undo stp max-hops command to restore the default.
By default, the maximum number of hops of an MST region is 20.
The maximum hops limit the size of the MST region.
Related commands: display stp.
Examples
# Set the maximum hops of the MST region to 35.
<Sysname> system-view
[Sysname] stp max-hops 35
stp mcheck
Syntax
stp mcheck
View
System view, Ethernet interface view, aggregate interface view
Default level
2: System level
Parameters
None
Description
Use the stp mcheck command 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 mode.
Then, you can perform an mCheck operation to forcibly transition the port to operation in the original mode.
The device works in STP-compatible, RSTP, MSTP mode depending on the spanning tree mode setting.
The stp mcheck command is effective only when the device works 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.
Configured in aggregate interface view, the setting takes effect only on the aggregate interface.
Configured on a member port in an aggregation group, the setting takes effect only after the port leaves the aggregation group.
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 work in STP-compatible mode.
rstp: Configures the spanning tree device to work in RSTP mode.
mstp: Configures the spanning tree device to work in MSTP mode.
Description
Use the stp mode command to configure the spanning tree work mode.
Use the undo stp mode command to restore the default.
By default, a spanning tree device works in MSTP mode.
Related commands: stp mcheck and stp enable.
Examples
# Configure the spanning tree device to work 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, aggregate interface view
Default level
2: System level
Parameters
None
Description
Use the stp no-agreement-check command to enable No Agreement Check on the ports.
Use the undo stp no-agreement-check command 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.
Configured in aggregate interface view, the setting takes effect only on the aggregate interface.
Configured on a member port in an aggregation group, the setting takes effect only after the port leaves the aggregation 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 the stp pathcost-standard command to specify a standard for the device to use when calculating the default path costs for ports.
Use the undo stp pathcost-standard command to restore the default.
By default, the legacy standard is used to calculate the default path costs for ports.
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, aggregate interface 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 the stp point-to-point command to configure the link type of the ports.
Use the undo stp point-to-point command to restore the 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.
Configured in aggregate interface view, the setting takes effect only on the aggregate interface.
Configured on a member port in an aggregation group, the setting takes effect only after the port leaves the aggregation group.
When connecting to a non-point-to-point link, a port is incapable of rapid state transition.
You can configure the link type as point-to-point for an aggregate interface or a port that works in full duplex mode. H3C recommends that you use the default setting to let the device automatically detect the port link type.
The stp point-to-point force-false or stp point-to-point force-true command configured on a port in MSTP mode is effective for all MSTIs.
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, aggregate interface view
Default level
2: System level
Parameters
instance instance-id: Sets the priority of the ports in a particular MSTI. The instance-id argument specifies a MSTI ID, and ranges from 0 to 15. MSTI 0 is the CIST.
priority: Specifies a port priority, ranging from 0 to 240 in steps of 16 (as in 0, 16, 32).
Description
Use the stp port priority command to set the priority of the ports.
Use the undo stp port priority command to restore the default.
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.
Configured in aggregate interface view, the setting takes effect only on the aggregate interface.
Configured on a member port in an aggregation group, the setting takes effect only after the port leaves the aggregation group.
You can set different priorities for a port in different MSTIs, so that packets from different VLANs are forwarded along different physical links to implement VLAN-based load sharing.
When the priority of a port is changed, MSTP will re-calculate the port role and transition its state.
Related commands: display stp.
Examples
# 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 | all }
View
System view
Default level
2: System level
Parameters
instance instance-id: Enables output of port state transition information for the specified MSTI. The instance-id argument specifies a MSTI ID, and ranges from 0 to 15. MSTI 0 is the CIST.
all: Specifies all MSTIs.
vlan vlan-list: Specifies a VLAN list in the format of vlan-list = { vlan-id [ to vlan-id ] }&<1-10>, where the vlan-id argument represents the VLAN ID, and &<1-10> indicates that you can specify up to 10 VLAN IDs or VLAN ID ranges.
Description
Use the stp port-log command to enable output of port state transition information for the specified MSTI or all MSTIs.
Use the undo stp port-log command to disable output of port state transition information for the specified MSTI or all MSTIs.
By default, output of port state transition information is enabled.
Examples
# Enable output of port state transition information for MSTI 2.
<Sysname> system-view
[Sysname] stp port-log instance 2
%Aug 16 00:49:41:856 2006 Sysname MSTP/3/PDISC: Instance 2's GigabitEthernet1/0/1 has been set to discarding state!
%Aug 16 00:49:41:856 2006 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 instance-id argument specifies a MSTI ID, and ranges from 0 to 15. MSTI 0 is the CIST.
priority: Specifies a device priority, ranging from 0 to 61440 in steps of 4096 (as in 0, 4096, 8192). You can set up to 16 priority values on the device. The smaller the value, the higher the device priority.
Description
Use the stp priority command to set the priority of the device.
Use the undo stp priority command to restore the default priority.
By default, the device priority is 32768.
Examples
# 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 the stp region-configuration command to enter MST region view.
Use the undo stp region-configuration command 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 instance-id argument specifies a MSTI ID, and ranges from 0 to 15. MSTI 0 is the CIST.
Description
Use the stp root primary command to configure the device as the root bridge.
Use the undo stp root command to restore the default.
By default, a device is not a root bridge.
An MSTI has only one valid root bridge. If you specify two or more devices as the root bridges for the same MSTI, the device with the lowest MAC address acts as the root bridge.
You can specify a root bridge for each MSTI, regardless of device priorities. 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
# Specify the 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 instance-id argument specifies a MSTI ID, and ranges from 0 to 15. MSTI 0 is the CIST.
Description
Use the stp root secondary command to configure the device as a secondary root bridge.
Use the undo stp root command to restore the default.
By default, a device is not a secondary root bridge.
You can configure multiple secondary root bridges for an MSTI. When the root bridge of the MSTI fails or is powered down, a secondary root bridge can take over to become the root bridge. However, if you specify a new root bridge for the MSTI, a secondary root bridge will not take over. If you configure multiple secondary root bridges for an MSTI, the one with the lowest MAC address will take over.
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
# Specify the 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, aggregate interface view
Default level
2: System level
Parameters
None
Description
Use the stp root-protection command to enable the root guard function on the ports.
Use the undo stp root-protection command 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.
Configured in aggregate interface view, the setting takes effect only on the aggregate interface.
Configured on the member port in an aggregation group, the setting takes effect only after the port leaves the aggregation group.
You cannot configure root guard and loop guard on a port at the same time.
Related commands: 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 the stp tc-protection enable command to enable the TC-BPDU attack guard function for the device.
Use the stp tc-protection disable command 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 the stp tc-protection threshold command to configure the maximum number of forwarding address entry flushes that the device can perform every a certain period of time (10 seconds).
Use the undo stp tc-protection threshold command 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 (as in 400, 500, 600).
Description
Use the stp timer forward-delay command to set the forward delay timer of the device.
Use the undo stp timer forward-delay command to restore the 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 goes 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
# 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 (as in 100, 200, 300).
Description
Use the stp timer hello command to set the hello time of the device.
Use the undo stp timer hello command to restore the 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
# 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 (as in 600, 700, 800).
Description
Use the stp timer max-age command to set the max age timer of the device.
Use the undo stp timer max-age command to restore the 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
# 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 the stp timer-factor command to set the timeout factor, which decides the timeout time.
Timeout time = timeout factor × 3 × hello time.
Use the undo stp timer-factor command 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, 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, aggregate interface 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 the stp transmit-limit command 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 the undo stp transmit-limit command to restore the default.
By default, the maximum transmission rate of all ports 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.
Configured in aggregate interface view, the setting takes effect only on the aggregate interface.
Configured on a member port in an aggregation group, the setting takes effect only after the port leaves the aggregation 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, which ranges from 1 to 15.
Description
Use the vlan-mapping modulo command to map VLANs in the 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
