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NE40E-M2 V800R010C10SPC500 Configuration Guide - WAN Access 01

This is NE40E-M2 V800R010C10SPC500 Configuration Guide - WAN Access
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Configuring an IMA Group to Transport ATM Services

Configuring an IMA Group to Transport ATM Services

Before configuring an IMA group to transport ATM services, familiarize yourself with the usage scenario, complete the pre-configuration tasks, and obtain the data required for the configuration.

Context

When users access an ATM network at a rate between T1 and T3 or between E1 and E3, it is cost-ineffective for the carrier to use T3 or E3 lines. In this situation, using an IMA group that aggregates multiple T1 or E1 lines to carry ATM services is more flexible and efficient.

An IMA group can be considered a logical link that aggregates several low-speed physical links (member links) to provide higher bandwidth. The rate of the logical link is approximately the sum of the rate of the member links in the IMA group.

Pre-configuration Tasks

Before configuring an IMA group interface, connect interfaces and set their physical parameters to ensure that the physical status of the interfaces can go Up.

Configuration Procedures

Figure 11-1 Flowchart for configuring an IMA group to transport ATM services

Creating an IMA Group Interface and Adding an Interface to It

To increase bandwidth, create an IMA group and bundle several links in the IMA group.

Context

Interfaces can only be added to an IMA group interface that has been created. After an IMA group interface is created, add a serial interface to the IMA group interface.

Procedure

  • Create an IMA group interface.

    1. Run system-view

      The system view is displayed.

    2. Run interface ima-group interface-number

      An IMA group interface is created.

    3. Run quit

      Exit from the IMA group interface view.

  • Add a serial interface to the created IMA group interface.

    1. Run interface serial interface-number

      The serial interface view is displayed.

      NOTE:

      The IMA group interface and the serial interface to be added to the IMA group interface must reside on the same subcard of the same board.

    2. Run link-protocol atm

      ATM is configured as the link layer protocol of the serial interface.

    3. Run ima ima-group interface-number

      The serial interface is added to the created IMA group interface.

      NOTE:
      After a serial interface is added to a created IMA group interface, the ATM interface type configured for the IMA group interface before the serial interface is added becomes invalid. You must run the atm interface-type { uni | nni } command in the IMA group interface view to reconfigure the ATM interface type for the IMA group interface.
      • If a device is connected to a user device through an IMA group interface, set the ATM interface type of the IMA group interface to UNI.

      • If a device is connected to a network device through an IMA group interface, set the ATM interface type of the IMA group interface to NNI.

    4. Run quit

      Exit from the serial interface view.

(Optional) Configuring IMA Group Parameters

Configure IMA group parameters as required.

Context

The following table lists the IMA group parameters and their usage scenarios in inverse multiplexing and de-multiplexing of ATM cells.

Table 11-1 IMA Group Parameters

Parameter

Description

Usage Scenario

differential-delay

Maximum link differential delay for an IMA group

Link differential delay (LDD) is the difference between delays at which packets are sent along member links in an IMA group. The difference between delays at which packets are sent by member links in an IMA group must be less than or equal to the value configured using the differential-delay command.

To improve bandwidth usage of IMA channels and prevent empty packets from consuming bandwidth, decrease the maximum LDD if traffic is heavy on the network.

frame-length

Number of ATM cells in an IMA frame

The transmit and receive ends of an IMA group work as follows:
  • Transmit end: receives an ATM cell stream from the ATM layer, distributes the ATM cells in the stream on a cell by cell basis among the member links in the IMA group, and sends them to the receive end periodically.
  • Receive end: reassembles received cells to recover the original ATM cell stream and transmits the stream to the ATM layer.

You can run the frame-length command to set the number of ATM cells in an IMA frame. To ensure transmission efficiency on links, use the default configuration.

min-active-links

Minimum number of active links that are required for an IMA group to work properly

An IMA group is a logical link that consists of one or more physical links. It provides more bandwidth than a single link. The minimum number of active links must be set in an IMA group before the IMA group can work properly. If a link fails, the number of active links in an IMA group in the Operational state may be less than the configured minimum value. As a result, the IMA group status changes and even becomes Down.

The minimum number of active links that are required for an IMA group to work properly depends on the bandwidth allocated to the IMA group. An IMA group can work properly only when the number of active links in an IMA group is greater than or equal to min-active-links. The configured minimum number of active links must be less than or equal to the number of links in the IMA group.

By default, an IMA group can work properly when there is at least one active link in the group.

bandwidth-overload

Logical bandwidth for an IMA group interface

The physical bandwidth on an interface is limited, which restricts the bandwidth that can be allocated to PVCs After logical bandwidth is configured for an IMA group interface, the bandwidth that can be allocated to the interface to be added to the IMA group interface is increased. Bandwidth for PVCs must meet the following requirements:

  • Bandwidth for each PVC cannot be greater than the physical interface's bandwidth.
  • Total bandwidth for all PVCs must be lower than the sum of the physical bandwidth and logical bandwidth.

clock

Clock mode

If two devices are directly connected using global IMA-group interfaces, run the clock command to configure a clock mode for each global IMA-group interface so that the two devices can communicate. A global IMA-group interface can work in either of the following clock modes:
  • CTC mode: All member links of an IMA group share the same clock source, which is either an external clock or the clock of a member link.
  • ITC mode: Member links of an IMA group use different clock sources.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface ima-group interface-number[.subinterface ]

    The IMA group interface (sub-interface) view is displayed.

  3. Run any of the following commands:

    • To set the maximum LDD for an IMA group, run the differential-delay command.

    • To set the number of ATM cells in an IMA frame, run the frame-length command.

    • To set the minimum number of active links that are required for an IMA group to work properly, run the min-active-links command.

    • To configure logical bandwidth for an IMA group interface, run the service bandwidth-overload command.

    • To configure a clock mode for the global IMA-group interface, run the clock { ctc | itc } command.

Configuring a Service Type for a PVC

To implement ATM traffic shaping, configure a service type for a PVC.

Context

To prevent the impact of heavy burst ATM traffic and ensure efficient use of network resources, you can configure a service type for a PVC to implement ATM traffic shaping. Doing so can limit the outgoing traffic on an ATM network within a proper range. To configure a service type for a PVC, you must create a service type in the system view and apply the service type to the PVC.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run atm service service-name { cbr output-pcr cdvt-value | nrt-vbr output-pcr output-scr output-mbs cdvt-value | rt-vbr output-pcr output-scr output-mbs cdvt-value | ubr output-pcr [ cdvt-value ] | ubr-plus output-pcr output-mcr cdvt-value }

    A service type is created and its value is set.

  3. Run interface ima-group interface-number[.subinterface ]

    The IMA group interface (sub-interface) view is displayed.

    NOTE:
    After the view of the IMA group interface or sub-interface is displayed, you can perform the following operations:
    • Run the atm-link check command to enable OAM on an IMA group sub-interface. If the PVC/PVP status of the IMA group sub-interface goes Down, the protocol status of the sub-interface also goes Down.

    • Run the pvc max-number command to set the maximum number of PVCs on an IMA group interface. If the number of PVC on the IMA group interface reaches the upper limit, no PVC can be created.

  4. Run pvc [ pvc-name ] vpi/vci

    A PVC is created, and the PVC view is displayed.

  5. (Optional) Run description text

    A description is configured for the PVC.

  6. Run service { output | input } service-name

    A specified service type is applied to the PVC.

(Optional) Configuring Continuity Check on ATM Services

After ATM cell relay has been configured on an ATM interface or a logical interface whose link layer protocol is ATM, you can perform a continuity check on the ATM services.

Context

NOTE:

This configuration process is supported only on the Admin-VS.

Before performing a continuity check on ATM services, you must complete the following tasks:
  1. Check that the physical layer status and protocol layer status of the interface on which the continuity check is to be performed are both Up. If the interface is a synchronous serial interface, configure ATM as the link layer protocol for the interface.

  2. Configure a PVC or PVP on the interface.

  3. Configure the end-point attribute for the connection point of the PVC or PVP on the device that initiates the continuity test.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run llid

    An LLID is configured.

    NOTE:

    The LLID command must be configured both on the local and remote devices.

  3. Run test connectivity interface interface-type interface-number { pvc vpi/vci | pvp vpi } llid llid

    A continuity check is performed on ATM services.

  4. Run commit

    The configuration is committed.

Configuring the Alarm threshold of ATM Module

After configuring the ATM module to report alarms to the NMS, you can monitor the alarm status of the ATM module on the NMS interface.

Procedure

  1. Run interface serial interface-number

    The view of the specified serial interface is displayed.

  2. Run link-protocol atm

    ATM is configured as the link layer protocol of the serial interface.

  3. Run trap-threshold { atmpw-lospkt-exc | atmpw-misorderpkt-exc | atmpw-unknowncell-exc } trigger-threshold trigger-threshold-value resume-threshold resume-threshold-value

    The alarm generation and clearing thresholds for ATM service transport performance are configured.

  4. Run commit

    The configuration is committed.

Verifying the IMA Group Configuration

After completing configurations on an IMA group interface, verify the configuration.

Prerequisites

An IMA group has been configured to transport ATM services.

Procedure

  • Run the display atm pvc-info [ interface interface-type interface-number [ pvc { pvc-name [ vpi/vci ] | vpi/vci } ] ] command to check PVC information.
  • Run the display atm service [ service-name ] command to check information about the service type configured for a PVC.
  • Run the display interface ima-group [ group-number ] command to check configurations and status of an IMA group interface.
  • Run the display connectivity-test interface interface-type interface-number { pvc vpi/vci | pvp vpi } command to check the result of continuity check on ATM services.
  • Run the display atm llid command to check whether the LLID takes effect.

Example

Run the display atm pvc-info command. The command output shows the status of PVCs and the interface where the PVCs reside.
<HUAWEI> display atm pvc-info
 VPI/VCI  |STATE|PVC-NAME        |ENCAP    |PROTOCOL|INTERFACE
----------|-----|----------------|---------|--------|-----------------
   1/10   |DOWN |huawei          |None     |None    |Ima-group0/1/0.1 (UP)
   1/11   |DOWN |                |None     |None    |Ima-group0/1/0.1 (UP)
Run the display atm service [ service-name ] command. The command output shows information about the service type configured for a PVC.
<HUAWEI> display atm service cbr
Atm Service Config:
        Service Name: cbr
        State: VALID
        Index: 0
        ServiceType:  CBR
        PCR: 111
        SCR: 0
        MBS: 0
        CDVT: 111
        Traffic Type: Shaper
Run the display interface ima-group command. The command output shows configurations and status of an IMA group interface.
<HUAWEI> display interface ima-group 0/1/0
Ima-group0/1/0 current state : UP (ifindex: 11222)
Line protocol current state : UP 
Description: 
Route Port,The Maximum Transmit Unit is 1500
VCs on main-interface: 0 (Total VCs: 31)
VPs on main-interface: 0 (Total VPs: 0)
Current system time: 2014-03-07 15:56:48
Physical layer is ATM over IMA
IMA-clock: CTC, differential-delay-maximum: 25, active-links-minimum: 1
frame-length: 128, symmetry: symmetrical configuration and operation
  IMA_GRP_NE_STATE: startUp, IMA_GRP_FE_STATE: startUp
  IMA links: 1
  Link Serial0/0/2/10:1
  Alarm : NONE 
  Defect : LIF 
    oam send: 0,  oam receive: 0
    Last 20 seconds input rate 0 bits/sec, 0 cells/sec
    Last 20 seconds output rate 0 bits/sec, 0 cells/sec
    Input: 0 cells, 0 bytes, 0 Errs, 0 CRC
    Output: 0 cells, 0 bytes
    Last 20 seconds input utility rate:  0.00%
    Last 20 seconds output utility rate: 0.00%

# Run the display connectivity-test command. The command output shows the result of the continuity check on ATM services carried by PVC 11/11 on IMA group 0/1/0.1.

PVC 11/11 Atm connectivity test is OK.

# Run the display atm llid command. The command output shows that the LLID takes effect.

       LLID(Loopback Location IDentifier)
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01-02-03-04-05-06-07-08-09-10-11-12-13-14-15-16
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Updated: 2019-01-02

Document ID: EDOC1100058399

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