05-Layer 2—WAN Access Command Reference

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03-HDLC commands
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03-HDLC commands 121.33 KB

HDLC commands

link-protocol hdlc

Use link-protocol hdlc to enable HDLC encapsulation on an interface.

Syntax

link-protocol hdlc

Default

PPP encapsulation is enabled on an interface.

Views

POS interface view

Serial interface view

Predefined user roles

network-admin

Usage guidelines

HDLC can transport the network layer protocols, such as IP and IPv6.

Examples

# Enable HDLC encapsulation on Serial 2/1/0.

<Sysname> system-view

[Sysname] interface serial 2/1/0

[Sysname-Serial2/1/0] link-protocol hdlc

timer-hold

Use timer-hold to set the keepalive interval on an interface.

Use undo timer-hold to restore the default.

Syntax

timer-hold seconds

undo timer-hold

Default

The keepalive interval is 10 seconds on an interface.

Views

POS interface view

Serial interface view

Predefined user roles

network-admin

Parameters

seconds: Specifies the keepalive interval in the range 0 to 32767 seconds.

Usage guidelines

HDLC uses the polling mechanism to determine whether the link status is normal.

An HDLC-enabled interface can regularly check link status by sending keepalives to the peer at the keepalive interval at the link layer. A keepalive carries the local sender sequence number and the last received sequence number of the peer.

After sending a keepalive, an interface increments the sender sequence number by 1 in the next keepalive when the following conditions exist:

·     The interface receives a response within the keepalive interval.

·     The response carries the sender sequence number in the sent keepalive.

After sending a keepalive, if the interface does not receive a response within the keepalive interval, it resends the keepalive with an unchanged sequence number. When the keepalive retry limit is reached, the interface considers the link faulty and reports a link layer down event.

Link status check is disabled if you set the keepalive interval to 0.

As a best practice, set the same keepalive interval for the two ends of a link.

If the network has a long delay or is experiencing congestion, you can increase the keepalive interval to prevent the link from being closed.

Examples

# Set the keepalive interval to 100 seconds on Serial 2/1/0.

<Sysname> system-view

[Sysname] interface serial 2/1/0

[Sysname-serial2/1/0] timer-hold 100

Related commands

timer-hold retry

timer-hold retry

Use timer-hold retry to set the keepalive retry limit on an interface.

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 on an interface.

Views

POS interface view

Serial interface view

Pre-defined user roles

network-admin

Parameters

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

Usage guidelines

HDLC uses the polling mechanism to determine whether the link status is normal.

An HDLC-enabled interface can regularly check link status by sending keepalives to the peer at the keepalive interval at the link layer. A keepalive carries the local sender sequence number and the last received sequence number of the peer.

After sending a keepalive, an interface increments the sender sequence number by 1 in the next keepalive when the following conditions exist:

·     The interface receives a response within the keepalive interval.

·     The response carries the sender sequence number in the sent keepalive.

After sending a keepalive, if the interface does not receive a response within the keepalive interval, it resends the keepalive with an unchanged sequence number. When the keepalive retry limit is reached, the interface considers the link faulty and reports a link layer down event.

If the network has a long delay or is experiencing congestion, you can increase the keepalive retry limit to prevent the link from being closed.

Examples

# Set the keepalive retry limit to 10 on Serial 2/1/0.

<Sysname> system-view

[Sysname] interface serial 2/1/0

[Sysname-Serial2/1/0] timer-hold retry 10

Related commands

timer-hold


HDLC link bundling commands

bandwidth

Use bandwidth to set 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

HDLC link bundle interface view

Predefined user roles

network-admin

Parameters

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

Usage guidelines

The expected bandwidth of an interface affects the link costs in OSPF, OSPFv3, and IS-IS. For more information, see Layer 3—IP Routing Configuration Guide.

Examples

# Set the expected bandwidth to 1000 kbps for HDLC link bundle interface 1.

<Sysname> system-view

[Sysname] interface hdlc-bundle 1

[Sysname-HDLC-bundle1] bandwidth 1000

bundle id

Use bundle id to assign an interface to an HDLC link bundle.

Use undo bundle id to restore the default.

Syntax

bundle id bundle-id

undo bundle id

Default

An interface is not assigned to any HDLC link bundle.

Views

POS interface view

Serial interface view

Predefined user roles

network-admin

Parameters

bundle-id: Specifies an HDLC link bundle by its number. The value range for this argument is 1 to 10.

Usage guidelines

An interface can be the member of only one HDLC link bundle. To move an interface from one HDLC link bundle to another HDLC link bundle, remove the interface from the current HDLC link bundle first.

You must enable HDLC encapsulation on an interface to be assigned to an HDLC link bundle. You cannot change the link layer protocol encapsulation of an HDLC link bundle member interface.

You can assign interfaces to an HDLC link bundle before you create the HDLC link bundle.

Examples

# Assign POS 2/2/0 to HDLC link bundle 1.

<Sysname> system-view

[Sysname] interface pos 2/2/0

[Sysname-Pos2/2/0] bundle id 1

bundle load-balance

Use bundle load-balance to set the load balancing mode for an HDLC link bundle interface.

Use undo bundle load-balance to restore the default.

Syntax

bundle load-balance { per-flow | per-packet }

undo bundle load-balance

Default

Per-packet load balancing is used.

Views

HDLC link bundle interface view

Predefined user roles

network-admin

Parameters

per-flow: Specifies per-flow load balancing.

per-packet: Specifies per-packet load balancing.

Usage guidelines

The following load balancing modes are available:

·     Per-flow load balancing—Forwards packets of the same flow out of the same Selected interface. A flow is identified by match criteria.

¡     For IPv4 and IPv6 packets, the match criteria include source IP address and destination IP address.

¡     For MPLS packets, the match criteria are MPLS labels.

·     Per-packet load balancing—Distributes packets evenly across all Selected interfaces by using the round-robin method.

Examples

# Set per-flow load balancing mode for HDLC link bundle interface 1.

<Sysname> system-view

[Sysname] interface hdlc-bundle 1

[Sysname-HDLC-bundle1] bundle load-balance per-flow

bundle max-active links

Use bundle max-active links to set the maximum number of Selected interfaces allowed in an HDLC link bundle.

Use undo bundle max-active links to restore the default.

Syntax

bundle max-active links number

undo bundle max-active links

Default

The maximum number of Selected interfaces allowed in an HDLC link bundle is the maximum number supported by the device.

Views

HDLC link bundle interface view

Predefined user roles

network-admin

Parameters

number: Specifies the maximum number of Selected interfaces allowed in an HDLC link bundle. The value range for this argument is 1 to 16.

Usage guidelines

The value specified by using this command cannot be smaller than the value specified by using the bundle min-active links command.

Use the bundle max-active links command together with the bundle member-priority command to make sure both ends of a link always have the same Selected status. The communication fails when one end is Selected but the other end is Unselected.

Examples

# Set the maximum number of Selected interfaces allowed in HDLC link bundle 1 to 8.

<Sysname> system-view

[Sysname] interface hdlc-bundle 1

[Sysname-HDLC-bundle1] bundle max-active links 8

Related commands

bundle member-priority

bundle min-active links

bundle member-priority

Use bundle member-priority to set the bundling priority value for an HDLC-enabled interface.

Use undo bundle member-priority to restore the default.

Syntax

bundle member-priority priority

undo bundle member-priority

Default

The bundling priority value of an HDLC-enabled interface is 32768.

Views

POS interface view

Serial interface view

Predefined user roles

network-admin

Parameters

priority: Specifies the bundling priority value of an HDLC-enabled interface. The value range for this argument is 1 to 65535. A higher priority value means a lower bundling priority.

Examples

# Set the bundling priority value to 1 for HDLC-enabled interface POS 2/2/0.

<Sysname> system-view

[Sysname] interface pos 2/2/0

[Sysname-Pos2/2/0] bundle member-priority 1

bundle min-active bandwidth

Use bundle min-active bandwidth to set the minimum bandwidth required for bringing up an HDLC link bundle interface.

Use undo bundle min-active bandwidth to restore the default.

Syntax

bundle min-active bandwidth bandwidth

undo bundle min-active bandwidth

Default

The minimum bandwidth required for bringing up an HDLC link bundle is not set.

Views

HDLC link bundle interface view

Predefined user roles

network-admin

Parameters

bandwidth: Specifies the minimum bandwidth (in kbps) required for bringing up an HDLC link bundle interface. The value range for this argument is 64 to 1342177280.

Examples

# Set the minimum bandwidth required for bringing up HDLC link bundle 1 to 1000 kbps.

<Sysname> system-view

[Sysname] interface hdlc-bundle 1

[Sysname-HDLC-bundle1] bundle min-active bandwidth 1000

bundle min-active links

Use bundle min-active links to set the minimum number of Selected interfaces required for bringing up an HDLC link bundle interface.

Use undo bundle min-active links to restore the default.

Syntax

bundle min-active links number

undo bundle min-active links

Default

The minimum number of Selected interfaces required for bringing up an HDLC link bundle is not set.

Views

HDLC link bundle interface view

Predefined user roles

network-admin

Parameters

number: Specifies the minimum number of Selected interfaces required for bringing up an HDLC link bundle interface. The value range for this argument is 1 to 16.

Usage guidelines

The value specified by using this command cannot be greater than the value specified by using the bundle max-active links command.

Examples

# Set the minimum number of Selected interfaces required for bringing up HDLC link bundle 1 to 5.

<Sysname> system-view

[Sysname] interface hdlc-bundle 1

[Sysname-HDLC-bundle1] bundle min-active links 5

Related commands

bundle max-active links

default

Use default to restore the default settings for an HDLC link bundle interface.

Syntax

default

Views

HDLC link bundle interface view

Predefined user roles

network-admin

Usage guidelines

CAUTION

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. Use the display this command in interface view to identify these commands, and then use their undo forms or follow the command reference to individually restore their default settings. If your restoration attempt still fails, follow the error message instructions to resolve the problem.

Examples

# Restore the default settings for HDLC link bundle interface 1.

<Sysname> system-view

[Sysname] interface hdlc-bundle 1

[Sysname-HDLC-bundle1] 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 description of an interface is the interface name followed by the Interface string, for example, Hdlc-bundle1 Interface.

Views

HDLC link bundle interface view

Predefined user roles

network-admin

Parameters

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

Examples

# Set the description of HDLC link bundle interface 1 to HDLC-bundle interface.

<Sysname> system-view

[Sysname] interface hdlc-bundle 1

[Sysname-HDLC-bundle1] description HDLC-bundle interface

display bundle hdlc-bundle

Use display bundle hdlc-bundle to display information about an HDLC link bundle.

Syntax

In standalone mode:

display bundle hdlc-bundle [ bundle-id ]

In IRF mode:

display bundle hdlc-bundle [ bundle-id ] slot slot-number

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

bundle-id: Specifies an HDLC link bundle by its number. If this argument is not specified, this command displays information for all HDLC link bundles.

slot slot-number: Specifies an IRF member device by its member ID. (In IRF mode.)

Usage guidelines

The HDLC link bundle information displayed for the active MPU includes information about all member interfaces.

The information displayed for a standby MPU or any other interface card includes only information about member interfaces on the MPU or card.

Examples

# (In standalone mode.) Display information about HDLC link bundle 1 on the active MPU.

<Sysname> display bundle hdlc-bundle 1

Bundle: HDLC-bundle1

  max-active links: 2, min-active links: 2, min-active bandwidth: 1000000 kbps

  Selected members: 2, Total bandwidth: 1244160 kbps

  Member              State               Bandwidth(kbps)     Priority

  Pos2/2/1            Selected            622080              1

  Pos2/2/2            Selected            622080              2

  Pos2/2/4            Ready               622080              32768

  Pos2/2/3            Ready               622080              65535

  Pos2/2/5            Ready               155520              32768

  Pos2/2/6            Ready               155520              32768

# (In IRF mode.) Display information about HDLC link bundle 1 on the interface card in slot 2 or IRF member device 2.

<Sysname> display bundle hdlc-bundle 1 slot 2

Bundle: HDLC-bundle1, slot 2

  max-active links: 2, min-active links: 2, min-active bandwidth: 1000000 kbps

  Selected members: 2, Total bandwidth: 1244160 kbps

  Member              State               Bandwidth(kbps)     Priority

  Pos2/2/1            Selected            622080              1

  Pos2/2/2            Selected            622080              2

Table 1 Command output

Field

Description

Bundle

Name of the HDLC link bundle.

max-active links

Maximum number of Selected interfaces allowed in the HDLC link bundle interface. This field will not be displayed if you have not set the limit.

min-active links

Minimum number of Selected interfaces required for bringing up the HDLC link bundle interface. This field will not be displayed if you have not set the limit.

min-active bandwidth

Minimum bandwidth required for bringing up the HDLC link bundle interface. This field will not be displayed if you have not set the limit.

Selected members

Current number of Selected interfaces.

Total bandwidth

Total bandwidth of all the Selected interfaces in the HDLC link bundle.

Member

Name of a member interface.

State

State of a member interface:

·     Selected—On an interface card, only information about Selected interfaces is displayed.

·     Ready.

·     Negotiated.

·     Initial.

Bandwidth(kbps)

Bandwidth (in kbps) of a member interface.

Priority

Bundling priority of a member interface.

 

display interface hdlc-bundle

Use display interface hdlc-bundle to display information about an HDLC link bundle interface.

Syntax

display interface [ hdlc-bundle [ bundle-id ] ] [ brief [ description | down ] ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

hdlc-bundle [ bundle-id ]: Specifies an HDLC link bundle interface by its number. If you do not specify the hdlc-bundle keyword, this command displays information about all interfaces except VA interfaces. If you specify the hdlc-bundle keyword without any HDLC link bundle interface number, this command displays information about all HDLC link bundle interfaces.

brief: Displays brief interface information. If you do not specify this keyword, this 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 each interface description.

down: Displays information about interfaces in DOWN state and the link down causes. If you do not specify this keyword, the command displays information about interfaces in all states.

Examples

# Display detailed information about HDLC link bundle interface 1.

<Sysname> display interface hdlc-bundle 1

HDLC-bundle1

Current state: UP

Line protocol state: UP

Description: HDLC-bundle1 Interface

Bandwidth: 128kbps

Maximum Transmit Unit: 1500

Hold timer: 10 seconds, retry times: 5

Internet address: 1.1.1.1/24 (primary)

Link layer protocol: HDLC

Physical: HDLC-BUNDLE, baudrate: 128000 bps

Port priority: 0

Output queue - Urgent queuing: Size/Length/Discards 0/1024/0

Output queue - Protocol queuing: Size/Length/Discards 0/500/0

Output queue - FIFO queuing: Size/Length/Discards 0/75/0

Last clearing of counters: Never

Last 300 seconds input rate: 0 bytes/sec, 0 bits/sec, 0 packets/sec

Last 300 seconds output rate: 0 bytes/sec, 0 bits/sec, 0 packets/sec

Input: 32 packets, 1842 bytes, 0 drops

Output: 27 packets, 1512 bytes, 0 drops

# Display brief information about HDLC link bundle interface 1.

<Sysname> display interface hdlc-bundle 1 brief

Brief information on interfaces in route mode:

Link: ADM - administratively down; Stby - standby

Protocol: (s) - spoofing

Interface            Link Protocol Primary IP         Description

HDLC-B1              UP   UP       1.1.1.2

# Display information about all HDLC link bundle interfaces in down state and the link down reasons.

<Sysname> display interface hdlc-bundle brief down

Brief information on interfaces in route mode:

Link: ADM - administratively down; Stby - standby

Interface            Link Cause

HDLC-B2              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 Transmit Unit

MTU on the interface.

Hold timer

Keepalive transmission interval of the interface.

This field is ineffective for an HDLC link bundle interface because an HDLC link bundle interface does not transmit keepalives.

Retry times

Maximum number of keepalive retransmission attempts. A link is removed after the maximum number of retransmission attempts is reached.

Internet protocol processing: Disabled

The interface is not assigned an IP address and cannot process IP packets.

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 3IP Services Configuration Guide.

·     BOOTP-AllocatedBOOTP allocated IP address. For more information, see BOOTP client configuration in Layer 3IP Services Configuration Guide.

·     PPP-Negotiated—IP address assigned by a PPP server during PPP negotiation. For more information, see PPP configuration in Layer 2WAN Access Configuration Guide.

·     Unnumbered—IP address borrowed from another interface.

·     Cellular-Allocated—IP address allocated through the modem-manufacturer's proprietary protocol. For more information, see 3G/4G modem management in Layer 2WAN Access Configuration Guide.

·     MAD—IP address assigned to an IRF member device for MAD on the interface. For more information, see IRF configuration in Virtual Technologies Configuration Guide.

·     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.

Link layer protocol

Link layer protocol encapsulation on the HDLC link bundle interface.

Physical

Physical type of the HDLC link bundle interface.

Baudrate

Baudrate of the HDLC link bundle interface.

Output queue - Urgent queuing: Size/Length/Discards 0/1024/0

Output queue - Protocol queuing: Size/Length/Discards 0/500/0

Output queue - FIFO queuing: Size/Length/Discards 0/75/0

Traffic statistics for each output queue on the HDLC link bundle interface, including:

·     The number of packets in the queue (the queue size).

·     The maximum number of packets that the queue can hold (queue length).

·     The number of dropped packets.

The output queues on the HDLC link bundle interface include the following types:

·     Urgent queue.

·     Protocol queue.

·     FIFO queue.

Last clearing of counters

Time when the reset counters interface command was last used to clear the interface statistics. This field displays Never if the reset counters interface command has never been used on the interface since device startup.

Last 300 seconds input rate: 0 bytes/sec, 0 bits/sec, 0 packets/sec

Last 300 seconds output rate: 0 bytes/sec, 0 bits/sec, 0 packets/sec

Average incoming and outgoing traffic rates on the interface in the last 300 seconds.

Input: 32 packets, 1842 bytes, 0 drops

Incoming traffic size in packets and bytes and the number of dropped incoming packets on the interface.

Output: 27 packets, 1512 bytes, 0 drops

Outgoing traffic size in packets and bytes and the number of dropped outgoing packets on the interface.

Brief information on interfaces in 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. To see the primary interface, use the display interface-backup state command.

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. This value is typical of null interfaces and loopback interfaces.

Primary IP

Primary IP address of the interface. This field displays two hyphens (--) if the interface does not have an IP address.

Cause

Cause for the physical link state of an interface to be DOWN.

Administratively indicates that 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.

 

Related commands

reset counters interface

interface hdlc-bundle

Use interface hdlc-bundle to create an HDLC link bundle interface and enter its view, or enter the view of an existing HDLC link bundle interface.

Use undo interface hdlc-bundle to delete an HDLC link bundle interface.

Syntax

interface hdlc-bundle bundle-id

undo interface hdlc-bundle bundle-id

Default

No HDLC link bundle interface exists.

Views

System view

Predefined user roles

network-admin

Parameters

bundle-id: Specifies an HDLC link bundle interface by its number. The value range for this argument is 1 to 10.

Examples

# Create HDLC link bundle interface 1 and enter its view.

<Sysname> system-view

[Sysname] interface hdlc-bundle 1

[Sysname-HDLC-bundle1]

mtu

Use mtu to set the MTU size for an HDLC link bundle interface.

Use undo mtu to restore the default.

Syntax

mtu size

undo mtu

Default

The MTU size of an HDLC link bundle interface is 1500 bytes.

Views

HDLC link bundle interface view

Predefined user roles

network-admin

Parameters

size: Specifies the MTU in bytes for an HDLC link bundle interface. The value range for this argument is 46 to 1560.

Usage guidelines

The MTU size of an interface affects IP packet fragmentation and reassembly on the interface.

To make the MTU configuration take effect on an interface, you must re-enable the interface by using the shutdown command and the undo shutdown command.

Examples

# Set the MTU size of HDLC link bundle interface 1 to 1430 bytes.

<Sysname> system-view

[Sysname] interface hdlc-bundle 1

[Sysname-HDLC-bundle1] mtu 1430

reset counters interface hdlc-bundle

Use reset counters interface hdlc-bundle to clear the statistics of an HDLC link bundle interface.

Syntax

reset counters interface [ hdlc-bundle [ bundle-id ] ]

Views

User view

Predefined user roles

network-admin

Parameters

hdlc-bundle [ bundle-id ]: Specifies an HDLC link bundle interface by its number. The value range contains the numbers of existing HDLC link bundle interfaces. If you do not specify hdlc-bundle, this command clears the statistics of all interfaces except VA interfaces. If you specify hdlc-bundle but not bundle-id, this command clears the statistics of all HDLC link bundle interfaces. If you specify both hdlc-bundle and bundle-id, this command clears the statistics of the specified HDLC link bundle interface.

Usage guidelines

Before collecting traffic statistics within a period of time on an interface, you must clear the existing statistics.

Examples

# Clear the statistics of HDLC link bundle interface 1.

<Sysname> reset counters interface hdlc-bundle 1

Related commands

display interface hdlc-bundle

service

Use service to specify a primary traffic processing slot for an interface.

Use undo service to restore the default.

Syntax

In IRF mode:

service slot slot-number

undo service slot

Default

No primary traffic processing slot is specified for an interface.

Views

HDLC link bundle interface view

Predefined user roles

network-admin

Parameters

slot slot-number: Specifies an IRF member device by its member ID. (In IRF mode.)

Usage guidelines

Specify traffic processing slots if a feature requires that all traffic on an HDLC link bundle interface be processed on the same slot.

For high availability, you can specify one primary and one backup traffic processing slot by using the service command and the service standby command, respectively.

To avoid processing slot switchover, specify the primary slot before specifying the backup slot. If you specify the backup slot before specifying the primary slot, traffic is switched over to the primary slot immediately after you specify the primary slot.

If you specify both primary and backup slots for an interface, traffic on that interface is processed as follows:

·     The backup slot takes over when the primary slot becomes unavailable. The backup slot continues to process traffic for the interface after the primary slot becomes available again. The switchover will not occur until the backup slot becomes unavailable.

·     When no specified traffic processing slots are available, the traffic is processed on the slot at which it arrives. Then, the processing slot that first becomes available again takes over.

If you do not specify a primary or a backup traffic processing slot for an interface, traffic on that interface is processed on the slot at which the traffic arrives.

Examples

# Specify slot 1 as the primary traffic processing slot for HDLC link bundle interface 1.

<Sysname> system-view

[Sysname] interface hdlc-bundle 1

[Sysname-HDLC-bundle1] service slot 1

Related commands

service standby

service standby

Use service standby to specify a backup traffic processing slot for an interface.

Use undo service standby to restore the default.

Syntax

In IRF mode:

service standby slot slot-number

undo service standby slot

Default

No backup traffic processing slot is specified for an interface.

Views

HDLC link bundle interface view

Predefined user roles

network-admin

Parameters

slot slot-number: Specifies an IRF member device by its member ID. (In IRF mode.)

Usage guidelines

Specify traffic processing slots if a feature requires that all traffic on an HDLC link bundle interface be processed on the same slot.

For high availability, you can specify one primary and one backup traffic processing slot by using the service command and the service standby command, respectively.

To avoid processing slot switchover, specify the primary slot before specifying the backup slot. If you specify the backup slot before specifying the primary slot, traffic is switched over to the primary slot immediately after you specify the primary slot.

If you specify both primary and backup slots for an interface, traffic on that interface is processed as follows:

·     The backup slot takes over when the primary slot becomes unavailable. The backup slot continues to process traffic for the interface after the primary slot becomes available again. The switchover will not occur until the backup slot becomes unavailable.

·     When no specified traffic processing slots are available, the traffic is processed on the slot at which it arrives. Then, the processing slot that first becomes available again takes over.

If you do not specify a primary or a backup traffic processing slot for an interface, traffic on that interface is processed on the slot at which the traffic arrives.

Examples

# Specify slot 2 as the primary traffic processing slot and slot 3 as the backup traffic processing slot for HDLC link bundle interface 1.

<Sysname> system-view

[Sysname] interface hdlc-bundle 1

[Sysname-HDLC-bundle1] service slot 2

[Sysname-HDLC-bundle1] service standby slot 3

Related commands

service

shutdown

Use shutdown to shut down an HDLC link bundle interface.

Use undo shutdown to bring up an HDLC link bundle interface.

Syntax

shutdown

undo shutdown

Default

An HDLC link bundle interface is up.

Views

HDLC link bundle interface view

Predefined user roles

network-admin

Usage guidelines

When an HDLC link bundle interface is brought up, the state of each member interface is re-determined.

When an HDLC link bundle interface is shut down, the state of each Selected interface is placed into the Negotiated state.

Examples

# Shut down HDLC link bundle interface 1.

<Sysname> system-view

[Sysname] interface hdlc-bundle 1

[Sysname-HDLC-bundle1] shutdown