10-High Availability Command Reference

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05-ERPS commands
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05-ERPS commands 92.54 KB

ERPS commands

control-vlan

Use control-vlan to configure the control VLAN for an ERPS instance.

Use undo control-vlan to restore the default.

Syntax

control-vlan vlan-id

undo control-vlan

Default

An ERPS instance does not have control VLANs.

Views

ERPS instance view

Predefined user roles

network-admin

Parameters

vlan-id: Specifies the control VLAN by its ID in the range of 2 to 4094.

Usage guidelines

The control VLAN must be a VLAN that has not been created on the device.

Examples

# Configure VLAN 100 as the control VLAN for instance 1 of ERPS ring 1.

<Sysname> system-view

[Sysname] erps ring 1

[Sysname-erps-ring1] instance 1

[Sysname-erps-ring1-inst1] control-vlan 100

Related commands

instance

display erps

Use display erps to display brief ERPS ring information.

Syntax

display erps

Views

Any view

Predefined user roles

network-admin

network-operator

Examples

# Display brief ERPS ring information.

<Sysname> display erps

ERPS protocol status: Enabled

ERPS tcn-propagation: Enabled

Flags: R -- RPL, F -- Faulty, B -- Blocked,

       FS -- Forced switch, MS -- Manual switch

Ring   Instance   NodeRole   NodeState    Port0     Port1    Status

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

1      1          Owner      Idle         R,B                Enabled

1      2          Normal     Idle                            Disabled

2      1          Owner      Idle         R,B                Enabled

2      2          Normal     Idle                            Disabled

Table 1 Command output

Field

Description

ERPS protocol status

ERPS state:

·         Enabled—Globally enabled.

·         Disabled—Globally disabled.

ERPS tcn-propagation

State of the flush packet transparent transmission feature:

·         Enabled—Globally enabled.

·         Disabled—Globally disabled.

Ring

ERPS ring ID.

Instance

ERPS instance ID.

NodeRole

Node type:

·         Owner.

·         Neighbor.

·         Interconnection.

·         Normal.

NodeState

Node state:

·         Idle—The ERPS ring enters the idle state after initialization.

·         Protection—The ERPS ring enters the protection state when a link fails.

·         MS—Manual switching mode.

·         FS—Forced switching mode.

·         Pending—Transient mode between any two states.

·         -—ERPS is disabled for the ERPS instance or disabled globally.

Port0

State of port 0:

·         R—The port is an RPL port.

·         B—The port is blocked.

·         F—The port is unavailable and the link for the port is faulty.

·         FS—The port is in FS mode.

·         MS—The port is in MS mode.

·         -—The port is not an ERPS ring member port.

If this field is blank, the port is not in any of the previous states.

Port1

State of port 1:

·         R—The port is an RPL port.

·         B—The port is blocked.

·         F—The port is unavailable and the link for the port is faulty.

·         FS—The port is in FS mode.

·         MS—The port is in MS mode.

·         -—The port is not an ERPS ring member port.

If this field is blank, the port is not in any of the previous states.

Status

State of the ERPS instance:

·         Enabled.

·         Disabled.

 

display erps detail

Use display erps detail to display detailed ERPS ring information.

Syntax

display erps detail ring ring-id [ instance instance-id ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

ring ring-id: Specifies an ERPS ring by its ID in the range of 1 to 255.

instance instance-id: Specifies an ERPS instance by its ID in the range of 1 to 64. If you do not specify this option, this command displays detailed information about all instances for the ERPS ring.

Examples

# Display detailed information about instance 1 of ERPS ring 1.

<Sysname> display erps detail ring 1 instance 1

Ring ID                : 1

Port0                  : GigabitEthernet1/0/1

Port1                  : GigabitEthernet1/0/2

Subring                : Yes

Default MAC            : Yes

 

Instance ID            : 1

Node role              : Owner

Node state             : Idle

Connect (ring/instance): (1/2), (2/3)

Control VLAN           : 100

Protected VLAN         : Reference-instance 0 to 2

Guard timer            : 500 ms

Hold-off timer         : 1 sec

WTR timer              : 5 min

Revertive operation    : Non-revertive

Enable status          : Yes, Active Status : Yes

R-APS level            : 1

Port                   PortRole               PortStatus

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

Port0                  RPL                    Block

Port1                  Non-RPL                Up

# Display detailed information about all instances of ERPS ring 1.

<Sysname> display erps detail ring 1

Ring ID               : 1

Port0                 : GigabitEthernet1/0/1

Port1                 : GigabitEthernet1/0/2

Subring               : Yes

Default MAC           : Yes

 

Instance ID           : 1

Node role             : Owner

Node state            : Idle

Connect(ring/instance): (1/2), (2/3)

Control VLAN          : 100

Protected VLAN        : Reference-instance 0 to 2

Guard timer           : 500 ms

Hold-off timer        : 1 sec

WTR timer             : 5 min

Revertive operation   : Non-revertive

Enable status         : Yes, Active Status : Yes

R-APS level           : 1

Port                  PortRole               PortStatus

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

Port0                 RPL                    Block

Port1                 Non-RPL                Up

 

Instance ID           : 2

Node role             : Neighbor

Node state            : Idle

Connect(ring/instance): (1/2), (2/3)

Control VLAN          : 200

Protected VLAN        : Reference-instance 3

Guard timer           : 500 ms

Hold-off timer        : 1 sec

Wtr timer             : 5 min

Revertive operation   : Non-revertive

Enable status         : Yes, Active Status : Yes

R-APS level           : 1

Port                  PortRole               PortStatus

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

Port0                 RPL                    Block

Port1                 Non-RPL                Up

Table 2 Command output

Field

Description

Port0

ERPS ring member port 0.

Port1

ERPS ring member port 1.

Subring

ERPS subring status:

·         Yes—The ring is a subring.

·         No—The ring is not a subring.

Default MAC

Default MAC address status:

·         Yes—The last byte is 1 in the destination MAC address of R-APS packets.

·         No—The last byte is the ring ID in the destination MAC address of R-APS packets.

Node role

Node type:

·         Owner.

·         Neighbor.

·         Interconnection.

·         Normal.

Node state

Node state:

·         Idle—The ERPS ring enters the idle status after initialization.

·         Protection—The ERPS ring enters the protection state when a link fails.

·         MS—Manual switching mode.

·         FS—Forced switching mode.

·         Pending—Transient mode between any two states.

·         -—ERPS is disabled for the ERPS instance or disabled globally.

Connect(ring/instance)

Ring or instance associated with the ERPS instance.

Control VLAN

Control VLAN of the ERPS instance.

Protected VLAN

List of VLANs protected by the ERPS instance, which are represented by MSTIs.

To view the mapping between MSTIs and VLANs, use the display stp region-configuration command.

Guard timer

Guard timer in milliseconds.

Hold-off timer

Hold-off timer in milliseconds.

WTR timer

WTR timer in minutes.

Revertive operation

Revertive mode:

·         Non-revertive.

·         Revertive.

Enable status

ERPS status for the instance:

·         Yes—Enabled.

·         No—Disabled.

Active Status

Global ERPS status and ERPS status for the instance:

·         Yes—Enabled.

·         No—Disabled.

R-APS level

Level of the R-APS packets.

Port

ERPS ring member port.

PortRole

Port role:

·         RPL—The port is an RPL port.

·         Non-RPL—The port is not an RPL port.

Port Status

Port status:

·         Block—The port is blocked.

·         Up—The link is up.

·         Down—The link is down.

 

display erps statistics

Use display erps statistics to display ERPS packet statistics.

Syntax

display erps statistics ring-id [ instance instance-id ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

ring ring-id: Specifies an ERPS ring by its ID in the range of 1 to 255.

instance instance-id: Specifies an ERPS instance by its ID in the range of 1 to 64. If you do not specify this option, this command displays packet statistics for all instances of the ERPS ring.

Examples

# Display packet statistics for all instances of ERPS ring 1.

<Sysname> display erps statistics ring 1

  Statistics for ERPS ring 1 instance 1:

  R-APS      Port0(Tx/Rx)             Port1(Tx/Rx)

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

  NR         1/1                      1/1

  NR,RB      0/1                      0/1

  SF         1/0                      1/0

  MS         0/0                      0/0

  FS         0/0                      0/0

  Total      2/2                      2/2

 

  Statistics for ERPS ring 1 instance 2:

  R-APS      Port0(Tx/Rx)             Port1(Tx/Rx)

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

  NR         1/1                      1/1

  NR,RB      0/1                      0/1

  SF         1/0                      1/0

  MS         0/0                      0/0

  FS         0/0                      0/0

  Total      2/2                      2/2

Table 3 Command output

Field

Description

R-APS

Packet type.

Port0(Tx/Rx)

Packet statistics for port 0:

·         Tx—Transmitted packets.

·         Rx—Received packets.

Port1(Tx/Rx)

Packet statistics for port 1:

·         Tx—Transmitted packets.

·         Rx—Received packets.

 

erps clear

Use erps clear to remove the MS mode and FS mode settings for an ERPS ring.

Syntax

erps clear ring-id instance instance-id

Views

System view

Predefined user roles

network-admin

Parameters

ring ring-id: Specifies an ERPS ring by its ID in the range of 1 to 255.

instance instance-id: Specifies an ERPS instance by its ID in the range of 1 to 64.

Usage guidelines

After you configure this command, the owner node can ignore the WTR timer and immediately switch traffic to the recovered link upon link recovery.

This command also switches an ERPS ring in non-revertive mode to revertive mode.

Examples

# Remove the MS mode and FS mode settings for instance 1 on ERPS ring 1.

<Sysname> system-view

[Sysname] erps clear ring 1 instance 1

erps enable

Use erps enable to enable ERPS globally.

Use undo erps enable to restore the default.

Syntax

erps enable

undo erps enable

Default

ERPS is disabled globally.

Views

System view

Predefined user roles

network-admin

Examples

# Enable ERPS.

<Sysname> system-view

[Sysname] erps enable

erps ring

Use erps ring to create an ERPS ring.

Use undo erps ring to delete an ERPS ring.

Syntax

erps ring ring-id

undo erps ring ring-id

Default

No ERPS rings exist.

Views

System view

Predefined user roles

network-admin

Parameters

ring ring-id: Specifies an ERPS ring by its ID in the range of 1 to 255.

Usage guideline

To delete an ERPS ring successfully, delete all ERPS instances on the ring first.

Examples

# Create ERPS ring 1.

<Sysname> system-view

[Sysname] erps ring 1

[Sysname-erps-ring1]

Related commands

instance

erps switch

Use erps switch to configure the switching mode for an ERPS ring.

Syntax

erps switch { force | manual } ring ring-id instance instance-id { port0 | port1 }

Views

System view

Predefined user roles

network-admin

Parameters

force: Configures the forced switching mode.

manual: Configures the manual switching mode.

port0: Specifies the ERPS ring member port 0.

port1: Specifies the ERPS ring member port 1.

ring ring-id: Specifies an ERPS ring by its ID in the range of 1 to 255.

instance instance-id: Specifies an ERPS instance by its ID in the range of 1 to 64.

Examples

# Configure the forced switching mode for port 1 of instance 1 on ERPS ring 1.

<Sysname> system-view

[Sysname] erps switch force ring 1 instance 1 port0

erps tcn-propagation

Use erps tcn-propagation to enable flush packet transparent transmission for an interconnection node.

Use undo erps tcn-propagation to restore the default.

Syntax

erps tcn-propagation

undo erps tcn-propagation

Default

Flush packet transparent transmission is disabled for an interconnection node.

Views

System view

Predefined user roles

network-admin

Usage guideline

This command must be used together with the sub-ring connect command.

Examples

# Enable flush packet transparent transmission for the interconnection node.

<Sysname> system-view

[Sysname] erps tcn-propagation

Related commands

sub-ring connect

instance

Use instance to create an instance for an ERPS ring.

Use undo instance to delete an instance from an ERPS ring.

Syntax

instance instance-id

undo instance instance-id

Default

An ERPS ring does not have instances.

Views

ERPS ring view

Predefined user roles

network-admin

Parameters

instance instance-id: Specifies an ERPS instance by its ID in the range of 1 to 64.

Usage guidelines

You can create multiple instances for an ERPS ring. Each instance has its own protected VLAN, control VLAN, and RPL owner. Each instance maintains its own state machine and data. You can locate an ERPS instance by its ring ID and VLAN ID.

Examples

# Create instance 1 for ERPS ring 1.

<Sysname> system-view

[Sysname] erps ring 1

[Sysname-erps-ring1] instance 1

[Sysname-erps-ring1-inst1]

Related commands

erps ring

instance enable

Use instance enable to enable ERPS for an ERPS instance.

Use undo instance enable to disable ERPS for an ERPS instance.

Syntax

instance enable

undo instance enable

Default

ERPS is disabled for ERPS instances.

Views

ERPS instance view

Predefined user roles

network-admin

Examples

# Create ERPS instance 1 and enable ERPS for the instance.

<Sysname> system-view

[Sysname] erps ring 1

[Sysname-erps-ring1] instance 1

[Sysname-erps-ring1-inst1] control-vlan 100

[Sysname-erps-ring1-inst1] protected-vlan reference-instance 0 1 2

[Sysname-erps-ring1-inst1] instance enable

Related commands

instance

node-role

Use node-role to configure the role for an ERPS node.

Use undo node-role to restore the default.

Syntax

node-role { { owner | neighbor } rpl | interconnection } { port0 | port1 }

undo node-role

Default

An ERPS node is a normal node.

Views

ERPS instance view

Predefined user roles

network-admin

Parameters

owner: Configures the owner node.

neighbor: Configures the neighbor node.

interconnection: Configures the interconnection node for connecting the major ring and subring.

Usage guidelines

For the owner node to work correctly, you must configure only one owner node for an ERPS ring.

You can configure an interconnection node only for a subring.

Examples

# Configure instance 1 of ERPS ring 1 as an RPL owner node and configure port 0 as an RPL port.

<Sysname> system-view

[Sysname] erps ring 1

[Sysname-erps-ring1] instance 1

[Sysname-erps-ring1-inst1] node-role owner rpl port0

port erps track

Use port erps track to associate an ERPS ring member port with a track entry.

Use undo port erps track to remove the association between an ERPS ring member port and a track entry.

Syntax

port erps ring ring-id instance instance-id track track-entry-index

undo port erps ring ring-id instance instance-id track

Default

An ERPS ring member port is not associated with track entries.

Views

Interface view

Predefined user roles

network-admin

Parameters

ring ring-id: Specifies an ERPS ring by its ID in the range of 1 to 255.

instance instance-id: Specifies an ERPS instance by its ID in the range of 1 to 64.

track-entry-index: Specifies a track entry by its ID in the range of 1 to 1024. For more information about specifying the track entry ID, see the track cfd command in "Track commands."

Usage guidelines

An ERPS ring member port collaborates with link detection protocols through track entries. ERPS supports only the CC feature of CFD to implement link detection.

Examples

# Associate a track entry with GigabitEthernet 1/0/1 on the RPL owner node in instance 1 of ERPS ring 1.

<Sysname> system-view

[Sysname] erps ring 1

[Sysname-erps-ring1] port0 interface gigabitethernet 1/0/1

[Sysname-erps-ring1] instance 1

[Sysname-erps-ring1-inst1] node-role owner rpl port0

[Sysname-erps-ring1-inst1] quit

[Sysname-erps-ring1] quit

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] port erps ring 1 instance 1 track 3

Related commands

track cfd

port0

Use port0 to specify the first member port for an ERPS ring.

Use undo port0 to restore the default.

Syntax

port0 interface interface-type interface-number

undo port0

Default

No member ports exist in an ERPS ring.

Views

ERPS ring view

Predefined user roles

network-admin

Parameters

interface interface-type interface-number: Specifies a Layer 2 Ethernet interface or a Layer 2 aggregate interface by its type and number.

Usage guidelines

Do not assign an interface to both an aggregation group and an ERPS ring. If you do so, the interface does not take effect on the ERPS ring and cannot be displayed by using the display erps detail command.

Examples

# Specify GigabitEthernet 1/0/1 as the first member port for ERPS ring 1.

<Sysname> system-view

[Sysname] erps ring 1

[Sysname-erps-ring1] port0 interface gigabitethernet 1/0/1

port1

Use port1 to specify the second member port for an ERPS ring.

Use undo port1 to restore the default.

Syntax

port1 interface interface-type interface-number

undo port1

Default

No member ports exist in an ERPS ring.

Views

ERPS ring view

Predefined user roles

network-admin

Parameters

interface interface-type interface-number: Specifies a Layer 2 Ethernet interface or a Layer 2 aggregate interface by its type and number.

Usage guidelines

Do not assign an interface to both an aggregation group and an ERPS ring. If you do so, the interface does not take effect on the ERPS ring and cannot be displayed by using the display erps detail command.

Examples

# Specify GigabitEthernet 1/0/2 as the second member port for ERPS ring 1.

<Sysname> system-view

[Sysname] erps ring 1

[Sysname-erps-ring1] port1 interface gigabitethernet 1/0/2

protected-vlan

Use protected-vlan to configure protected VLANs for an ERPS instance.

Use undo protected-vlan to delete protected VLANs for an ERPS instance.

Syntax

protected-vlan reference-instance instance-id-list

undo protected-vlan [ reference-instance instance-id-list ]

Default

No protected VLANs exist in an ERPS instance.

Views

ERPS instance view

Predefined user roles

network-admin

Parameters

instance-id-list: Specifies a space-separated list of up to 10 MSTI items. Each item specifies an MSTI or a range of MSTIs in the form of instance-id1 to instance-id2. The value for instance-id2 must be greater than or equal to the value for instance-id1. The value range for the instance-id argument is 0 to 4094. The value 0 indicates CIST. You can use the display stp region-configuration command to display the VLAN-to-instance mappings. In PVST mode, the system automatically maps VLANs to MSTIs.

Usage guidelines

If you do not specify the reference-instance instance-id-list option, the undo protected-vlan command deletes all mappings between MSTIs and VLANs in the ERPS instance. The protected VLANs change if the mappings between the MSTIs and VLANs change.

Examples

# Configure the protected VLANs for instance 1 of ERPS ring 1.

<Sysname> system-view

[Sysname] erps ring 1

[Sysname-erps-ring1] instance 1

[Sysname-erps-ring1-inst1] protected-vlan reference-instance 0 1 2

Related commands

display stp region-configuration

r-aps level

Use r-aps level to configure the level for R-APS packets.

Use undo r-aps level to restore the default.

Syntax

r-aps level level-value

undo r-aps level

Default

The R-APS packet level is 7.

Views

ERPS instance view

Predefined user roles

network-admin

Parameters

level-value: Specifies the R-APS packet level in the range of 0 to 7.

Usage guidelines

The R-APS packet level must be the same for all nodes in an instance of an ERPS ring.

Examples

# Configure the R-APS packet level as 1 for instance 1 of ERPS ring 1.

<Sysname> system-view

[Sysname] erps ring 1

[Sysname-erps-ring1] instance 1

[Sysname-erps-ring1-inst1] r-aps level 1

r-aps ring-mac

Use r-aps ring-mac to configure the ring ID as the last byte of the destination MAC address for R-APS packets.

Use undo r-aps ring-mac to restore the default.

Syntax

r-aps ring-mac

undo r-aps ring-mac

Default

The last byte of the destination MAC address is 1 for the R-APS packets.

Views

ERPS ring view

Predefined user roles

network-admin

Examples

# Configure the ID of ERPS ring 2 as the last byte of the destination MAC address for R-APS packets.

<Sysname> system-view

[Sysname] erps ring 2

[Sysname-erps-ring2] r-aps ring-mac

reset erps statistics

Use reset erps statistics to clear ERPS packet statistics.

Syntax

reset erps statistics ring ring-id [ instance instance-id ]

Views

User view

Predefined user roles

network-admin

Parameters

ring ring-id: Specifies an ERPS ring by its ID in the range of 1 to 255.

instance instance-id: Specifies an ERPS instance by its ID in the range of 1 to 64. If you do not specify this option, this command clears packet statistics for all instances of the ERPS ring.

Examples

# Clear packet statistics for instance 1 of ERPS ring 1.

<Sysname> reset erps statistics ring 1 instance 1

Related commands

display erps statistics

revertive-operation

Use revertive-operation non-revertive to set the non-revertive mode for an ERPS ring.

Use undo revertive-operation to restore the default.

Syntax

revertive-operation non-revertive

undo revertive-operation

Default

An ERPS ring operates in revertive mode.

Views

ERPS instance view

Predefined user roles

network-admin

Usage guidelines

In non-revertive mode, an owner node does not perform any operations when receiving NR packets. You can use the erps clear command to restore the revertive mode.

Examples

# Set the non-revertive mode for instance 1 of ERPS ring 1.

<Sysname> system-view

[Sysname] erps ring 1

[Sysname-erps-ring1] instance 1

[Sysname-erps-ring1-inst1] revertive-operation non-revertive

ring-type sub-ring

Use ring-type sub-ring to configure the ERPS ring as a subring.

Use undo ring-type sub-ring to restore the default.

Syntax

ring-type sub-ring

undo ring-type

Default

An ERPS ring is a major ring.

Views

ERPS ring view

Predefined user roles

network-admin

Examples

# Configure ERPS ring 1 as a subring.

<Sysname> system-view

[Sysname] erps ring 1

[Sysname-erps-ring1] ring-type sub-ring

sub-ring connect

Use sub-ring connect to associate the subring with an ERPS ring.

Use undo sub-ring connect to remove the association.

Syntax

sub-ring connect ring ring-id instance instance-id

undo sub-ring connect ring ring-id instance instance-id

Default

A subring is not associated with ERPS rings.

Views

ERPS instance view

Predefined user roles

network-admin

Parameters

ring ring-id: Specifies an ERPS ring by its ID in the range of 1 to 255.

instance instance-id: Specifies an ERPS instance by its ID in the range of 1 to 64.

Examples

# Configure ERPS ring 1 as a subring for instance 1, and associate the subring with ERPS ring 2.

<Sysname> system-view

[Sysname] erps ring 2

[Sysname-erps-ring2] instance 1

[Sysname-erps-ring2] quit

[Sysname] erps ring 1

[Sysname-erps-ring1] ring-type sub-ring

[Sysname-erps-ring1] instance 1

[Sysname-erps-ring1-inst1] sub-ring connect ring 2 instance 1

Related commands

ring-type sub-ring

timer guard

Use timer guard to set the guard timer for an ERPS instance.

Use undo timer guard to restore the default.

Syntax

timer guard guard-value

undo timer guard

Default

The guard timer is 500 milliseconds for an ERPS instance.

Views

ERPS instance view

Predefined user roles

network-admin

Parameters

guard-value: Specifies the guard timer in the range of 0 to 2000 milliseconds and in step of 10.

Usage guidelines

The guard timer starts when the link recovers. The system processes only the flush packets before the guard timer expires. The guard timer prevents SF messages from impacting the network.

Examples

# Set the guard timer to 30 milliseconds for instance 1 of ERPS ring 1.

<Sysname> system-view

[Sysname] erps ring 1

[Sysname-erps-ring1] instance 1

[Sysname-erps-ring1-inst1] timer guard 30

timer hold-off

Use timer hold-off to set the hold-off timer for an ERPS instance.

Use undo timer hold-off to restore the default.

Syntax

timer hold-off hold-off-value

undo timer hold-off

Default

The hold-off timer is 0 milliseconds for an ERPS instance.

Views

ERPS instance view

Predefined user roles

network-admin

Parameters

hold-off-value: Specifies the hold-off timer in the range of 0 to 10000 milliseconds and in step of 100.

Usage guidelines

The hold-off timer starts when the port detects a link fault. If the link fault persists when the hold-off timer expires, the port reports the link fault. The hold-off timer delays the fault report time and might impact the link recovery performance.

Examples

# Set the hold-off timer to 300 milliseconds for instance 1 of ERPS ring 1.

<Sysname> system-view

[Sysname] erps ring 1

[Sysname-erps-ring1] instance 1

[Sysname-erps-ring1-inst1] timer hold-off 300

timer wtr

Use timer wtr to set the WTR timer for an ERPS instance.

Use undo timer wtr to restore the default.

Syntax

timer wtr wtr-value

undo timer wtr

Default

The WTR timer is 5 minutes for an ERPS instance.

Views

ERPS instance view

Predefined user roles

network-admin

Parameters

wtr-value: Specifies the WTR timer in the range of 1 to 12 minutes and in step of 1.

Usage guidelines

This timer prevents intermittent link failures from impacting the network.

Examples

# Set the WTR timer to 3 minutes for instance 1 of ERPS ring 1.

<Sysname> system-view

[Sysname] erps ring 1

[Sysname-erps-ring1] instance 1

[Sysname-erps-ring1-inst1] timer wtr 3