Contents

POS interface commands· 1

alarm-detect 1

bandwidth· 1

clock· 2

crc· 3

dampening· 3

default 4

description· 5

display interface phy-option· 5

display interface pos· 7

display this interface· 12

flag c2· 12

flag j0· 13

flag j1· 14

flag j1 ignore· 14

flow-interval 15

frame-format 16

interface pos· 16

link-delay· 17

link-protocol 18

loopback· 18

mtu· 19

reset counters interface pos· 20

scramble· 20

shutdown· 21

speed· 21

threshold· 22

timer-hold· 23

timer-hold retry· 24

 

 

POS interface commands

alarm-detect

se alarm-detect to configure the action to take when an RDI, SD, or SF alarm occurs on an interface.

Use undo alarm-detect to restore the default.

Syntax

alarm-detect { rdi | sd | sf } action link-down

undo alarm-detect { rdi | sd | sf }

Default

The device does not take any actions on the interface when an RDI, SD, or SF alarm occurs.

Views

Standard POS interface view

Predefined user roles

network-admin

mdc-admin

Parameters

rdi: Specifies remote defect indication (RDI) alarms.

sd: Specifies signal degrade (SD) alarms.

sf: Specifies signal fail (SF) alarms.

action: Specifies the action to take when the specified alarm is detected on the interface.

link-down: Places the interface in down state.

Usage guidelines

An RDI alarm occurs if the device receives multiplexer section remote defect indication (MS-RDI) signals from the remote end.

An SD or SF alarm occurs if the bit error rate of incoming packets crosses the SD or SF alarm threshold. To set the SD or SF alarm threshold, use the threshold command.

Examples

# Configure Pos 1/2/2/1 to go down when an SD alarm occurs.

<Sysname> system-view

[Sysname] interface pos 1/2/2/1

[Sysname-Pos1/2/2/1] alarm-detect sd action link-down

Related commands

threshold

bandwidth

Use bandwidth to configure the expected bandwidth of an interface.

Use undo bandwidth to restore the default.

Syntax

bandwidth bandwidth-value

undo bandwidth

Default

The expected bandwidth (in kbps) is the interface baud rate divided by 1000.

Views

Standard POS interface view

Predefined user roles

network-admin

mdc-admin

Parameters

bandwidth-value: Specifies the expected bandwidth in the range of 1 to 400000000 kbps.

Usage guidelines

The expected bandwidth is an informational parameter used only by higher-layer protocols for calculation. You cannot adjust the actual bandwidth of an interface by using this command.

Examples

# Set the expected bandwidth to 50 kbps for Pos 1/2/2/1.

<Sysname> system-view

[Sysname] interface pos 1/2/2/1

[Sysname-Pos1/2/2/1] bandwidth 50

clock

Use clock to set the clock mode of a standard POS interface.

Use undo clock to restore the default.

Syntax

clock { master | slave }

undo clock

Default

The clock mode of a POS interface is slave.

Views

Standard POS interface view

Predefined user roles

network-admin

mdc-admin

Parameters

master: Sets the clock mode to master.

slave: Sets the clock mode to slave.

Usage guidelines

Standard POS interfaces support the following clock modes:

·     Master—Uses internal clock signal.

·     Slave—Uses line clock signal.

If the standard POS interface is connected to another router, set its clock mode to be different from the mode used by the remote end. If the standard POS interface is connected to a SONET/SDH device, which provides higher clock precision, always set its clock mode to slave.

Examples

# Set the clock mode to master for Pos 1/2/2/1.

<Sysname> system-view

[Sysname] interface pos 1/2/2/1

[Sysname-Pos1/2/2/1] clock master

crc

Use crc to set the CRC length on an interface.

Use undo crc to restore the default.

Syntax

crc { 16 | 32 }

undo crc

Default

The CRC length on an interface is 32 bits.

Views

Standard POS interface view

Predefined user roles

network-admin

mdc-admin

Parameters

16: Sets the CRC length to 16 bits.

32: Sets the CRC length to 32 bits.

Usage guidelines

The CRC length must be the same at both ends.

Examples

# Set the CRC length to 16 bits on Pos 1/2/2/1.

<Sysname> system-view

[Sysname] interface pos 1/2/2/1

[Sysname-Pos1/2/2/1] crc 16

dampening

Use dampening to enable the device to dampen an interface when it is flapping.

Use undo dampening to disable interface dampening.

Syntax

dampening [ half-life reuse suppress max-suppress-time ]

undo dampening

Default

Interface dampening is disabled on POS interfaces.

Views

Standard POS interface view

Predefined user roles

network-admin

mdc-admin

Parameters

half-life: Specifies the amount of time (in seconds) for a penalty to decrease by half of its value. The value range is 1 to 120 seconds, and the default is 54 seconds.

reuse: Specifies the reuse threshold. The value range is 200 to 20000, and the default is 750. The reuse threshold must be lower than the suppression threshold.

suppress: Specifies the suppression threshold. The value range is 200 to 20000, and the default is 2000.

max-suppress-time: Specifies the maximum amount of time an interface can be dampened. The value range is 1 to 255 seconds, and the default is 162 seconds (three times the default half-life timer).

Usage guidelines

This command and the link-delay command cannot be both configured on an interface.

This command does not take effect on the administratively down events. When you execute the shutdown command, the penalty restores to 0, and the interface reports the down event to the higher layer protocols.

For more information about the interface dampening feature, see Interface Configuration Guide.

Examples

# Configure interface dampening on Pos 1/2/2/1.

<Sysname> system-view

[Sysname] interface pos 1/2/2/1

[Sysname-Pos1/2/2/1] dampening 2 800 3000 5

Related commands

display interface pos

link-delay

default

Use default to restore the default settings for an interface.

Syntax

default

Views

Standard POS interface view

Predefined user roles

network-admin

mdc-admin

Usage guidelines

	CAUTION: The default command might interrupt ongoing network services. Make sure you are fully aware of the impact of this command when you use it on a live network.

 

This command might fail to restore the default settings for some commands for reasons such as command dependencies or system restrictions. You can use the display this command in interface view to check for these commands, and use their undo forms or follow the command reference to restore their default settings. If your restoration attempt still fails, follow the error message to resolve the problem.

Examples

# Restore the default settings of Pos 1/2/2/1.

<Sysname> system-view

[Sysname] interface pos 1/2/2/1

[Sysname-Pos1/2/2/1] default

description

Use description to configure the description of an interface.

Use undo description to restore the default.

Syntax

description text

undo description

Default

The interface description uses the interface-name Interface format, for example, Pos1/2/2/1 Interface.

Views

Standard POS interface view

Predefined user roles

network-admin

mdc-admin

Parameters

text: Specifies the description, a case-sensitive string of 1 to 255 characters.

Examples

# Configure the description of Pos 1/2/2/1 as pos-interface.

<Sysname> system-view

[Sysname] interface pos 1/2/2/1

[Sysname-Pos1/2/2/1] description pos-interface

display interface phy-option

Use display interface phy-option to display the physical attributes of an interface.

Syntax

display interface [ interface-type [ interface-number ] ] phy-option

Views

Any view

Predefined user roles

network-admin

network-operator

mdc-admin

mdc-operator

Parameters

interface-type: Specifies an interface type.

interface-number: Specifies an interface number.

Usage guidelines

If you do not specify an interface type, this command displays information about all interfaces.

If you specify an interface type but do not specify an interface number, this command displays information about all interfaces of the specified type.

Examples

# Display the physical attributes of POS interface Pos1/2/2/1.

<Sysname> display interface pos 1/2/2/1 phy-option

Pos1/2/2/1

Current state: UP

Transceiver information:

  Transceiver Type: 1000_BASE_SX_SFP

  Wavelength(nm): 850

  Transfer Distance(m): 100

  Digital Diagnostic Monitoring : YES

  Vendor Name : H3C

  RX power: -3564dBm/100, Alarm thresholds:[-30, -10]uw/10

  TX power: -519dBm/100, Alarm thresholds:[0, 5]uw/10

Table 1 Command output

Field	Description
Current state	Physical link state of the interface: ·     Administratively DOWN—The interface has been shut down by using the shutdown command. ·     DOWN—The interface is administratively up, but its physical state is down (possibly because no physical link exists or the link has failed). ·     UP—The interface is both administratively and physically up.
Transceiver information	Transceiver module information.
Transceiver Type	Physical model of the transceiver module.
Wavelength(nm)	Central wavelength (in nm) of the transmit laser. If the transceiver module supports multiple wavelengths, every two wavelength values are separated by a comma. For a copper cable, this field displays N/A.
Transfer Distance(xx)	Transmission distance, where xx indicates the distance unit: ·     km—Kilometers, for single-mode transceiver modules. ·     m—Meters, for other transceiver modules. If the transceiver module supports multiple types of transmission media, this field displays the transmission distance for each type, in the form of transmission distance (medium type). Transmission medium types include: ·     9 um—9/125 µm single-mode fiber. ·     50 um—50/125 µm multimode fiber. ·     62.5 um—62.5/125 µm multimode fiber. ·     TP—Twisted pair. ·     CX4—CX4 cable.
Digital Diagnostic Monitoring	Support for digital diagnostic monitoring: ·     YES. ·     NO.
Vendor Name	Manufacturer or custom vendor of the transceiver module.
RX power(dBm/100)	Rx power in dBm/100.
TX power(dBm/100)	Tx power in dBm/100.
Alarm thresholds	Alarm thresholds for the Rx or Tx power.

‌

Related commands

display interface pos

display interface pos

Use display interface pos to display information about POS interfaces.

Syntax

display interface pos interface-number [ brief [ description | down ] ]

Views

Any view

Predefined user roles

network-admin

network-operator

mdc-admin

mdc-operator

Parameters

pos interface-number: Specifies a POS interface by its number. If you do not specify the pos keyword, this command displays information about all interfaces. If you specify the pos keyword without specifying an interface, this command displays information about all POS interfaces.

brief: Displays brief interface information. If you do not specify this keyword, the command displays detailed interface information.

description: Displays complete interface descriptions. If you do not specify this keyword, the command displays only the first 27 characters of interface descriptions.

down: Displays physically down interfaces and their down causes. If you do not specify this keyword, the command displays information about interfaces in any state.

Examples

# Display detailed information about Pos 1/2/2/1.

<Sysname> display interface pos 1/2/2/1

Pos1/2/2/1

Current state: DOWN

Line protocol state: DOWN

Description: Pos1/2/2/1 Interface

Bandwidth: 155520 kbps

Maximum transmission unit: 4470

Hold timer: 10 seconds, retry times: 5

Internet address: 24.1.0.2/24 (Primary)

Link layer protocol: PPP

LCP: initial

Physical layer is non-channelized STM-1/OC-3

Frame-format is SONET, Current baudrate is 155520000 bps

Scramble enabled, crc 32, clock slave, loopback not set

SD Threshold: 6 , SF Threshold: 4

Optical:OC3/STM_1_SR_SFP

 

Last link flapping: Never

Last clearing of counters: Never

Current system time:2020-05-21 15:05:07

Last time when physical state changed to up:-

Last time when physical state changed to down:2020-05-21 09:36:11

Regenerator section:

Section:

  Alarm:  LOS  LOF  OOF

  Error:  CV_S(B1) 131070

  Tx: J0: 0x01

  Rx: J0: 0xff

Multiplex section:

Line:

  Alarm:  AIS_L  SF_L  SD_L

  Error:  CV_L(B2) 134217726, REI_L 134217726

High order Path:

  Alarm:  TIM_P  AIS_P  RDI_P  ERDI_P  PLU_P  PLM_P

  Error:  CV_P(B3) 0, REI_P 0, PJE_P 0, NJE_P 0

  Tx: J1: ""

  Rx: J1: unknown

  Tx: C2: 0x16

  Rx: C2: 0xff

 

Last 5 seconds input rate: 0.00 bytes/sec, 0 bits/sec, 0.00 packets/sec

Last 5 seconds output rate: 0.00 bytes/sec, 0 bits/sec, 0.00 packets/sec

    Input: 0 packets, 0 bytes, 0 no buffers

           0 errors, 0 runts, 0 giants, 0 CRC,

           0 overruns, 0 aborts

    Output:0 packets, 0 bytes

           0 errors, 0 underruns, 0 aborts

# Display brief information about Pos 1/2/2/1.

<Sysname> display interface pos 1/2/2/1 brief

Brief information on interfaces in route mode:

Link: ADM - administratively down; Stby - standby

Protocol: (s) - spoofing

Interface            Link Protocol Primary IP      Description

Pos1/2/2/1           DOWN DOWN     --

# Display brief information about all standard POS interfaces in a down state and the causes.

<Sysname> display interface pos brief down

Brief information on interfaces in route mode:

Link: ADM - administratively down; Stby - standby

Interface            Link Cause

Pos1/2/2/1           ADM  Administratively

Table 2 Command output

Field	Description
Current state	Physical link state of the interface: ·     Administratively DOWN—The interface has been shut down by using the shutdown command. ·     DOWN—The interface is administratively up, but its physical state is down (possibly because no physical link exists or the link has failed). ·     UP—The interface is both administratively and physically up.
Line protocol state	Data link layer state of the interface. The state is determined through automatic parameter negotiation at the data link layer. ·     UP—The data link layer protocol is up. ·     DOWN—The data link layer protocol is down.
Description	Description of the interface.
Bandwidth	Expected bandwidth of the interface.
Maximum transmission unit	MTU of the interface.
Dampening enabled:  Penalty: 0 (not suppressed) Ceiling: 4525  Reuse: 800  Suppress: 3000  Half-life: 2 seconds  Max-suppress-time: 5 seconds  Flap count: 0	Interface dampening information: ·     Dampening enabled—The dampening feature is enabled. ·     Penalty—Penalty value. The interface suppression state is displayed in parentheses. ¡     Not suppressed—The interface is not dampened. Interface state changes are reported to higher layer protocols. ¡     Suppressed—The interface is dampened. Interface state changes are not reported to higher layer protocols. ·     Ceiling—Maximum penalty value. ·     Reuse—Reuse threshold. ·     Suppress—Suppression threshold. ·     Half-life—Half-life timer. ·     Max-suppress-time—Maximum suppression time. ·     Flap count—Number of times that the interface has flapped.
Hold timer	Interval at which the data link layer protocol sends keepalives.
retry times	Keepalive retry limit. The interface determines that the remote end is down if it does not receive a keepalive response after the keepalive retry limit has been made.
Internet address: ip-address/mask-length (Type)	IP address of the interface and type of the address in parentheses. Possible IP address types include: ·     Primary—Manually configured primary IP address. ·     Sub—Manually configured secondary IP address. If the interface has both primary and secondary IP addresses, the primary IP address is displayed. If the interface has only secondary IP addresses, the lowest secondary IP address is displayed. ·     DHCP-allocated—DHCP allocated IP address. For more information, see DHCP client configuration in Layer 3—IP Services Configuration Guide. ·     BOOTP-allocated—BOOTP allocated IP address. For more information, see BOOTP client configuration in Layer 3—IP Services Configuration Guide. ·     PPP-negotiated—IP address assigned by a PPP server during PPP negotiation. For more information, see PPP configuration in Layer 2—WAN Access Configuration Guide. ·     Unnumbered—IP address borrowed from another interface. ·     MTunnel—IP address of the multicast tunnel interface (MTI), which is the same as the IP address of the MVPN source interface. For more information, see multicast VPN configuration in IP Multicast Configuration Guide.
Internet Address	IP address of the interface. The primary attribute indicates that the address is the primary IP address.
Link layer protocol	Data link layer protocol of the interface.
LCP: opened, IPCP: opened	Both LCP negotiation and IPCP negotiation succeeded.
Physical layer	Physical interface.
Baudrate	Baudrate of the interface.
Scramble	Payload scrambling state.
crc	CRC length.
clock	Clock mode.
loopback	Loopback state.
SONET alarm	SONET alarms.
SONET error	SONET errors.
Last link flapping	The amount of time that has elapsed since the most recent physical state change of the interface. This field displays Never if the interface has been physically down since device startup.
Last clearing of counters	The most recent time that the reset counters interface pos command was executed. This field displays Never if the command has not been executed on the interface since device startup.
Current system time	If a time zone is not configured, the system time is displayed in the format of YYYY-MM-DD HH:MM:SS. If a time zone is configured, the system time is displayed in the format of YYYY-MM-DD HH:MM:SS UTC±HH:MM:SS.
Last 300 seconds input rate: 0 bytes/sec, 0 bits/sec, 0 packets/sec	Average input rates (in Bps, bps, and pps) for the last 300 seconds.
Last 300 seconds output rate: 0 bytes/sec, 0 bits/sec, 0 packets/sec	Average output rates (in Bps, bps, and pps) for the last 300 seconds.
Input:   0 packets, 0 bytes   0 errors, 0 runts, 0 giants, 0 CRC   0 overruns, 0 aborts, 0 no buffers	Inbound traffic statistics for the POS interface: ·     errors—Number of inbound packets with errors detected at the physical layer. ·     runts—Number of inbound packets shorter than the minimum frame length. ·     giants—Number of inbound packets larger than the maximum frame length. ·     CRC—Total number of inbound normal-size packets with CRC errors. ·     overruns—Number of packet drops because the input rate of the interface exceeded the forwarding capability. ·     aborts—Number of invalid inbound frames. ·     no buffers—Number of packet drops because the receive buffer is full.
Output:   0 packets, 0 bytes   0 errors, 0 underruns, 0 aborts	Outbound traffic statistics for the POS interface: ·     errors—Number of outbound packets with errors detected at the physical layer. ·     underruns—Number of packets dropped because the output rate of the interface exceeded the memory reading rate. ·     aborts—Total number of invalid outbound packets.
Brief information on interface(s) under route mode:	Brief information about Layer 3 interfaces.
Interface	Abbreviated interface name.
Link	Physical link state of the interface: ·     UP—The interface is physically up. ·     DOWN—The interface is physically down. ·     ADM—The interface has been shut down by using the shutdown command. To restore the physical state of the interface, use the undo shutdown command. ·     Stby—The interface is a backup interface in standby state.
Protocol	Data link layer protocol state of the interface: ·     UP—The data link layer protocol of the interface is up. ·     DOWN—The data link layer protocol of the interface is down. ·     UP(s)—The data link layer protocol of the interface is up, but the link is an on-demand link or does not exist. The (s)attribute represents the spoofing flag.
Primary IP	Primary IP address of the interface. This field displays two hyphens (--) if the interface does not have an IP address.
Description	Description of the interface.
Cause	Cause for the physical link state of an interface to be DOWN: ·     Administratively—The interface has been manually shut down by using the shutdown command. To restore the physical state of the interface, use the undo shutdown command. ·     Not connected—No physical connection exists (possibly because the network cable is disconnected or faulty).

 

Related commands

reset counters interface pos

display this interface

Use display this interface to display the operating status and information of an interface.

Syntax

display this interface

Views

Ethernet interface view

Predefined user roles

network-admin

mdc-admin

Usage guidelines

In interface view, to quickly view the operating status or packet statistics of the interface, execute this command.

For an interface, the output from the display this interface command in interface view is the same as the output from the display interface interface-type interface-number command in any view.

Related commands

display interface pos

flag c2

Use flag c2 to set the C2 path signal label byte.

Use undo flag c2 to restore the default.

Syntax

flag c2 flag-value

undo flag c2

Default

The C2 value is 16 in hexadecimal notation.

Views

Standard POS interface view

Predefined user roles

network-admin

mdc-admin

Parameters

flag-value: Specifies a C2 byte value, a hexadecimal number in the range of 0 to ff.

Usage guidelines

The C2 byte is a higher-order path overhead byte. It indicates the multiplex structure of virtual container (VC) frames and the property of payload.

When the C2 byte of one end is set to 1, the C2 byte of the other end can be set to any character in hexadecimal notation. If the C2 byte of either ends of a link is not set to 1, the C2 byte must be the same at both ends.

Examples

# Set the C2 byte to 01 in hexadecimal notation on Pos 1/2/2/1.

<Sysname> system-view

[Sysname] interface pos 1/2/2/1

[Sysname-Pos1/2/2/1] flag c2 01

Related commands

display interface pos

flag j0

Use flag j0 to set the J0 regenerator section trace byte for SONET or SDH frames.

Use undo flag j0 to restore the default.

Syntax

flag j0 { sdh | sonet } flag-value

undo flag j0 {sdh | sonet }

Default

The device uses the SDH framing format, and the J0 byte value is null in SDH frames.

Views

Standard POS interface view

Predefined user roles

network-admin

mdc-admin

Parameters

flag-value: Specifies the J0 byte. It must be a string of 1 to 15 characters for SDH, and a hexadecimal number in the range of 0 to ff for SONET.

sdh: Specifies the SDH framing format.

sonet: Specifies the SONET framing format.

Usage guidelines

J0 byte is a section overhead byte. SDH and SONET use this byte to test continuity of the connection between two interfaces at the section level.

The J0 byte can be different on devices of the same service provider. On the interfaces between two service providers, the J0 byte must be the same.

Examples

# Set the J0 byte to ff in hexadecimal notation for SDH on Pos 1/2/2/1.

<Sysname> system-view

[Sysname] interface pos 1/2/2/1

[Sysname-Pos1/2/2/1] flag j0 sdh ff

Related commands

display interface pos

frame-format

flag j1

Use flag j1 to set the J1 path trace byte for SONET or SDH frames.

Use undo flag j1 to restore the default.

Syntax

flag j1 { sdh | sonet } flag-value

undo flag j1 { sdh | sonet }

Default

The device uses the SDH framing format, and the J1 byte value is null in SDH frames.

Views

Standard POS interface view

Predefined user roles

network-admin

mdc-admin

Parameters

flag-value: Specifies a J1 byte value. It must be a string of 1 to 15 characters for SDH and a string of 1 to 62 characters for SONET.

sdh: Specifies the SDH framing format.

sonet: Specifies the SONET framing format.

Usage guidelines

J1 byte is a higher-order path overhead byte. SDH and SONET use this byte to test continuity of the connection between two interfaces at the path level.

The J1 byte must be the same at both ends of a link.

Examples

# Set the J1 byte to aabbcc for SDH on Pos 1/2/2/1.

<Sysname> system-view

[Sysname] interface pos 1/2/2/1

[Sysname-Pos1/2/2/1] flag j1 sdh aabbcc

Related commands

display interface pos

flag j1 ignore

frame-format

flag j1 ignore

Use flag j1 ignore to ignore CRC of the J1 byte.

Use undo flag j1 ignore to restore the default.

Syntax

flag j1 ignore

undo flag j1 ignore

Default

CRC is performed for the J1 byte.

Views

Standard POS interface view

Predefined user roles

network-admin

mdc-admin

Examples

# Ignore CRC of the J1 byte on Pos 1/2/2/1.

<Sysname> system-view

[Sysname] interface pos 1/2/2/1

[Sysname-Pos1/2/2/1] flag j1 ignore

Related commands

flag j1

flow-interval

Use flow-interval to set the statistics polling interval for an interface.

Use undo flow-interval to restore the default.

Syntax

flow-interval interval

undo flow-interval

Default

The statistics polling interval is 300 seconds.

Views

System view

Predefined user roles

network-admin

mdc-admin

Parameters

interval: Specifies the statistics polling interval. In system view, the statistics polling interval is in the range of 5 to 300 and in steps of 5.

Usage guidelines

In system view, the command takes effect on all interfaces.

Examples

# Set the statistics polling interval to 180 seconds.

<Sysname> system-view

[Sysname] flow-interval 180

frame-format

Use frame-format to set the framing format on a standard POS interface.

Use undo frame-format to restore the default.

Syntax

frame-format { sdh | sonet }

undo frame-format

Default

The framing format is SDH on a standard POS interface.

Views

Standard POS interface view

Predefined user roles

network-admin

mdc-admin

Parameters

sdh: Specifies the SDH framing format.

sonet: Specifies the SONET framing format.

Examples

# Set the framing format to SONET on Pos 1/2/2/1.

<Sysname> system-view

[Sysname] interface pos 1/2/2/1

[Sysname-Pos1/2/2/1] frame-format sonet

Related commands

flag j0

flag j1

interface pos

Use interface pos to enter POS interface view.

Syntax

interface pos interface-number

Views

System view

Predefined user roles

network-admin

mdc-admin

Parameters

interface-number: Specifies a standard POS interface by its number.

Examples

Examples

# Create POS interface Pos 1/2/2/1.

<Sysname> system-view

[Sysname] interface pos 1/2/2/1

[Sysname-Pos1/2/2/1]

Related commands

link-protocol

link-delay

Use link-delay to set the physical state change suppression interval on an interface.

Use undo link-delay to restore the default.

Syntax

link-delay msec milliseconds

undo link-delay

Default

The physical state change suppression interval is not configured.

Views

Standard POS interface view

Predefined user roles

network-admin

mdc-admin

Parameters

msec milliseconds: Sets the physical state change suppression interval on an interface, in milliseconds. The value range for this argument is 0 to 10000 ms.

Usage guidelines

When the physical state changes, a POS interface reports the event to the upper-layer modules, and generates log and SNMP notification messages. To reduce system overhead caused by frequent physical state changes, use this command to suppress physical state changes within an interval. The interface will ignore any changes that occur during each suppression interval. When the suppression interval expires, the interface will not report the change event or generate messages if the change is removed.

For example, the suppression interval starts when the interface changes from up to down. The interface reports the change event and generates messages if it is still down when the interval expires. The interface does not report the change event or generate messages if it is up when the interval expires.

This command and the dampening command cannot both be configured on an interface.

Examples

# Set the physical state change suppression interval to 100 milliseconds for Pos 1/2/2/1.

<Sysname> system-view

[Sysname] interface pos 1/2/2/1

[Sysname-Pos1/2/2/1] link-delay msec 100

Related commands

dampening

link-protocol

Use link-protocol to set the data link layer protocol of an interface.

Syntax

link-protocol { hdlc | ppp }

Default

PPP is used.

Views

Standard POS interface view

Predefined user roles

network-admin

mdc-admin

Parameters

hdlc: Specifies HDLC as the data link layer protocol of the interface.

ppp: Specifies PPP as the data link layer protocol of the interface.

Examples

# Specify HDLC as the data link protocol of Pos 1/2/2/1.

<Sysname> system-view

[Sysname] interface pos 1/2/2/1

[Sysname-Pos1/2/2/1] link-protocol hdlc

loopback

Use loopback to enable loopback for standard POS interface.

Use undo loopback to disable loopback for a standard POS interface.

Syntax

loopback { local | remote }

undo loopback

Default

Loopback is disabled on a standard POS interface.

Views

Standard POS interface view

Predefined user roles

network-admin

mdc-admin

Parameters

local: Enables internal loopback.

remote: Enables external loopback.

Usage guidelines

Loopback is intended for testing only. Disable the feature when the interface is operating correctly.

Before you use this command on a standard POS interface, make sure its clock mode is master.

When you enable internal loopback on a standard POS interface before you connect it to the peer end, the state of the data link layer protocol is reported as up.

Examples

# Enable internal loopback on Pos 1/2/2/1.

<Sysname> system-view

[Sysname] interface pos 1/2/2/1

[Sysname-Pos1/2/2/1] loopback local

Related commands

clock

mtu

Use mtu to set the MTU size for an interface.

Use undo mtu to restore the default.

Syntax

mtu size

undo mtu

Default

The MTU of an interface is 4470 bytes.

Views

Standard POS interface view

Predefined user roles

network-admin

mdc-admin

Parameters

size: Sets the maximum transmission unit (MTU) in bytes. The value range for this argument is 1280 to 9600 bytes.

Usage guidelines

The MTU setting affects the assembly and fragmentation of IP packets.

After configuring the MTU for an interface, you must use the shutdown command and then the undo shutdown command on the interface for the modification to take effect.

Examples

# Set the MTU to 1430 bytes for Pos 1/2/2/1.

<Sysname> system-view

[Sysname] interface pos 1/2/2/1

[Sysname-Pos1/2/2/1] mtu 1430

reset counters interface pos

Use reset counters interface pos to clear interface statistics.

Syntax

reset counters interface pos interface-number

Views

User view

Predefined user roles

network-admin

mdc-admin

Parameters

pos interface-number: Clears statistics for a POS interface specified by its number. If you do not specify the pos keyword, this command clears statistics for all interfaces. If you specify the pos keyword without specifying an interface, this command clears statistics for all POS interfaces.

Usage guidelines

Use this command to clear history statistics before you collect statistics for a time period.

Examples

# Clear statistics for Pos 1/2/2/1.

<Sysname> reset counters interface pos 1/2/2/1

Related commands

display interface pos

scramble

Use scramble to enable payload scrambling on an interface.

Use undo scramble to disable payload scrambling on an interface.

Syntax

scramble

undo scramble

Default

Payload scrambling is enabled on standard POS interfaces and POS channel interfaces.

Views

Standard POS interface view

Predefined user roles

network-admin

mdc-admin

Usage guidelines

Payload scrambling enables an interface to scramble outgoing data and descramble incoming data. By preventing the presence of long strings of all 1s or all 0s, payload scrambling enables the receiving end to extract the line clock signal correctly.

If payload scrambling is disabled, the interface does not scramble outgoing data or descramble incoming data.

The payload scrambling setting must be the same at both ends of a link to ensure correct communication.

For H3C devices, changing the payload scrambling setting does not affect cell headers. After you change the payload scrambling settings on both ends of a link, verify that the C2 byte value on them match each other. If the two values do not match, use the flag c2 command to modify the C2 byte value on the H3C device.

Examples

# Enable payload scrambling on Pos 1/2/2/1.

<Sysname> system-view

[Sysname] interface pos 1/2/2/1

[Sysname-Pos1/2/2/1] scramble

shutdown

Use shutdown to shut down an interface.

Use undo shutdown to bring up an interface.

Syntax

shutdown

undo shutdown

Default

An interface is up.

Views

Standard POS interface view

Predefined user roles

network-admin

mdc-admin

Examples

# Shut down Pos 1/2/2/1.

<Sysname> system-view

[Sysname] interface pos 1/2/2/1

[Sysname-Pos1/2/2/1] shutdown

speed

	NOTE: Support for this command depends on the device model.

 

Use speed to set the rate of a standard POS interface.

Use undo speed to restore the default.

Syntax

speed speed-value

undo speed

Default

The rate of a standard POS interface is 155 Mbps.

Views

Standard POS interface view

Predefined user roles

network-admin

mdc-admin

Parameters

speed-value: Specifies the rate in Mbps. Possible values include 155 Mbps, 622 Mbps, 2.5 Gbps, and 10 Gbps.

Examples

# Set the rate to 2.5 Gbps for Pos 1/2/2/1.

<Sysname>system-view

[Sysname] interface pos 1/2/2/1

[Sysname-Pos1/2/2/1] speed 2500

threshold

Use threshold to configure the power for setting the SD or SF alarm threshold on a standard POS interface.

Use undo threshold to restore the default power for setting the SD or SF alarm threshold on a standard POS interface.

Syntax

threshold { sd sdvalue | sf sfvalue } *

undo threshold [ sd | sf ]

Default

The SD alarm threshold is 6, and the SF alarm threshold is 4.

Views

Standard POS interface view

Predefined user roles

network-admin

mdc-admin

Parameters

sd: Specifies the SD alarm threshold.

sdvalue: Specifies the power for setting the SD alarm threshold. The threshold is 10e to the power of negative sdvalue (10e–sdvalue). The value range for this argument is 3 to 9.The greater the value, the lower the SD alarm threshold.

sf: Specifies the SF alarm threshold. The SF alarm threshold must be higher than the SD alarm threshold.

sfvalue: Specifies the power for setting the SF alarm threshold. The threshold is 10e to the power of negative sdvalue (10e–sfvalue). The value range for this argument is 3 to 9.The greater the value, the lower the SF alarm threshold.

Usage guidelines

SD and SF alarms indicate line performance. SF alarms are more severe than SD alarms.

·     An SD alarm occurs if the number of B2 errors reaches the SD alarm threshold.

·     An SF alarm occurs if the number of B2 errors reaches the SF alarm threshold.

Examples

#Set the SD threshold to 10e to the power of negative 4 (10e–4) on Pos 1/2/2/1.

<Sysname> system-view

[Sysname] interface pos 1/2/2/1

[Sysname-Pos1/2/2/1] threshold sd 4

timer-hold

Use timer-hold to set the keepalive interval.

Use undo timer-hold to restore the default.

Syntax

timer-hold seconds

undo timer-hold

Default

The keepalive interval is 10 seconds.

Views

Standard POS interface view

Predefined user roles

network-admin

mdc-admin

Parameters

seconds: Specifies the interval at which the interface sends keepalive packets. The value range for this argument is 0 to 32767 seconds.

Usage guidelines

On an interface encapsulated with PPP or HDLC, the data link layer sends keepalive packets at keepalive intervals to detect the availability of the remote end. The data link layer determines that the peer end is down if it does not receive a response after the keepalive retry limit has been made. The data link layer then reports the link down event to the upper-layer protocols.

To set the keepalive retry limit, use the timer-hold retry command.

On a slow link, increase the keepalive interval to prevent false shutdown of the interface. This situation might occur when keepalive packets are delayed because a large packet is being transmitted on the link.

Examples

# Set the keepalive interval to 15 seconds for Pos 1/2/2/1.

<Sysname> system-view

[Sysname] interface pos 1/2/2/1

[Sysname-Pos1/2/2/1] timer-hold 15

Related commands

timer-hold retry

timer-hold retry

Use timer-hold retry to set the keepalive retry limit.

Use undo timer-hold retry to restore the default.

Syntax

timer-hold retry retries

undo timer-hold retry

Default

The keepalive retry limit is 5.

Views

Standard POS interface view

Predefined user roles

network-admin

mdc-admin

Parameters

retries: Specifies the keepalive retry limit, in the range of 1 to 255.

Usage guidelines

The interface determines that the remote end is down if it does not receive a keepalive response after the keepalive retry limit has been made.

This command applies to interfaces encapsulated with PPP or HDLC. To set the keepalive interval, use the timer-hold command.

On a slow link, increase the keepalive retry limit to prevent false shutdown of the interface. This situation might occur when keepalive packets are delayed because a large packet is being transmitted on the link.

Examples

# Set the keepalive retry limit to 10 for Pos 1/2/2/1.

<Sysname> system-view

[Sysname] interface pos 1/2/2/1

[Sysname-Pos1/2/2/1] timer-hold retry 10

Related commands

timer-hold