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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 MP

Configuring MP

The Multilink Point-to-Point Protocol (MP) is a technique that bundles multiple Point-to-Point Protocol (PPP) links together to increase link bandwidth and improve link reliability.

Usage Scenario

A single PPP link provides only limited bandwidth. To increase link bandwidth and reliability, bundle multiple PPP links into an MP link.

In Figure 8-2, there are three PPP links between Device A and Device B. You can add these three PPP links to an MP-Group to create an MP link. Compared with a single PPP link, an MP link provides higher bandwidth. In an MP-Group, although one PPP link fails, other links keep properly transmitting services.

Figure 8-2 Communication over an MP link

Pre-configuration Tasks

Before you configure an MP link, establish PPP links.

Configuration Procedures

Figure 8-3 Flowchart for configuring an MP link

Configuring MP Implementations

An MP-Group interface is a logical interface used by MP applications. MP is implemented by adding multiple interfaces to an MP-Group interface.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface mp-group number

    An MP-Group interface is created, and the MP-Group interface view is displayed.

  3. Assign an IP address to the MP-Group interface.

    Perform either of the following operations to assign an IP address to the MP-Group interface:
    • To specify an IP address, run:

      Run ip address ip-address { mask | mask-length }

    • To configure the MP-Group interface to obtain an IP address from the remote device using PPP negotiation, run:

      Run ip address ppp-negotiate

  4. Run quit

    Return to the system view.

  5. Run interface serial interface-number

    The interface view is displayed.

  6. Run ppp mp mp-group number

    The interface is added to the MP-Group interface so that the interface works in MP mode.

    NOTE:

    The number value specified in this step must be the same as the number value specified in Step 2.

    Repeat Steps 5 and 6 to add multiple interfaces to the MP-Group interface.

  7. (Optional) Configure authentication. For detailed information about authentication configuration, see Configuring Unidirectional PAP Authentication or Configuring Unidirectional CHAP Authentication.
  8. After completing the configuration, restart all the physical interfaces to trigger PPP negotiation so that the physical interfaces are successfully added to the MP-Group interface.
    1. Run shutdown

      The interface is shut down.

    2. Run commit

      The configuration is committed.

    3. Run undo shutdown

      The interface is restarted.

    NOTE:

    The shutdown, commit, and undo shutdown commands must be run in sequence so that the preceding configuration can take effect after the interface is restarted.

  9. (Optional)Run cpos mix-link-protocol enable

    The coexistence of MLPPP services and any of TDM, ATM, and IMA services on CPOS subcards is enabled.

    This command is supported only on the Admin-VS.

  10. Run commit

    The configuration is committed.

(Optional) Disabling Endpoint Discriminator Negotiation

The Link Control Protocol (LCP) status is Up only if the endpoint discriminators for the MP-Group interfaces on both ends are the same. If they are different, disable endpoint discriminator negotiation on both ends.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface mp-group number

    An MP-Group interface is created, and the MP-Group interface view is displayed.

  3. Run undo discriminator

    Endpoint discriminator negotiation is disabled.

    NOTE:
    The endpoint discriminator negotiation configurations on both ends must be the same so that the LCP status can be Up. If the undo discriminator command is run on one end, whereas the discriminator command on the other end, the parameters sent by the end with the undo discriminator command configured do not contain the endpoint discriminator, but this end accepts the endpoint discriminator of the other end. As a result, the MP link fails to be established.

  4. Restart the MP-Group interface.
    1. Run shutdown

      The interface is shut down.

    2. Run commit

      The configuration is committed.

    3. Run undo shutdown

      The interface is restarted.

    NOTE:

    The shutdown, commit, and undo shutdowncommands must be run in sequence so that the preceding configuration can take effect after the interface is restarted.

  5. Run commit

    The configuration is committed.

(Optional) Configuring the MRRU

The maximum receive reconstructed unit (MRRU) defines the maximum size (in bytes) of each packet a device can receive without fragmenting the packet. The MRRU is negotiated by two ends on a Multilink Point-to-Point Protocol (MP) link. A local end sends packets or fragments with the maximum size equal to the negotiated MRRU to its peer. Upon receipt, the peer can accept the packets or reassemble fragments into packets.

Context

The interface MRRU, which is used in Link Control Protocol (LCP) negotiation, is closely related to the interface maximum transmission unit (MTU):
  • If the MRRU of the peer MP-Group interface is greater than or equal to the MTU of the local MP-Group interface, the local MP-Group interface keeps its own MTU unchanged during LCP negotiation.

  • If the MRRU of the peer MP-Group interface is less than the MTU of the local MP-Group interface, the local MP-Group interface uses the MRRU of the peer MP-Group interface as its own MTU during LCP negotiation.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface mp-group number

    An MP-Group interface is created, and the MP-Group interface view is displayed.

  3. Run mrru size

    The MRRU of the MP-Group interface is configured.

  4. Restart the MP-Group interface.
    1. Run shutdown

      The interface is shut down.

    2. Run commit

      The configuration is committed.

    3. Run undo shutdown

      The interface is restarted.

    NOTE:

    The shutdown, commit, and undo shutdown commands must be run in sequence so that the preceding configuration can take effect after the interface is restarted.

  5. Run commit

    The configuration is committed.

(Optional) Configuring the Short Sequence Number for Negotiation

A sequence number in the packet header indicates the sequence of a fragmented packet. Using short sequence number for negotiation shortens the packet length and improves communication reliability.

Context

A sequence number in the packet header indicates the sequence of a fragmented packet. The header of an MP packet can use either a 12-bit short sequence number or a 24-bit long sequence number. To configure an MP-group interface to use the short sequence number contained in packet headers to perform negotiation, run the short-sequence command. Using short sequence number for negotiation shortens the packet length and improves communication reliability.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface mp-group number

    An MP-Group interface is created, and the MP-Group interface view is displayed.

  3. Run short-sequence

    The MP-group interface is configured to use the short sequence number contained in packet headers to perform negotiation.

  4. Restart the MP-Group interface.
    1. Run shutdown

      The interface is shut down.

    2. Run commit

      The configuration is committed.

    3. Run undo shutdown

      The interface is restarted.

    NOTE:

    The shutdown, commit, and undo shutdown commands must be run in sequence so that the preceding configuration can take effect after the interface is restarted.

  5. Run commit

    The configuration is committed.

(Optional) Configuring MP Fragmentation

Setting a proper size for Multilink PPP (MP) fragments improves bandwidth use efficiency.

Context

To improve bandwidth use efficiency on an MP link, configure MP fragmentation and set a proper size for MP fragments.

Procedure

  1. Run system-view

    The system view is displayed.

  2. (Optional) Run mp statistics fragment-mode enable

    The fragment statistical mode is configured for all MP-group interfaces and global MP-group interfaces.

  3. Run interface mp-group number

    The MP-Group interface view is displayed.

  4. Run fragment-threshold threshold

    The maximum size of MP fragments is set.

    NOTE:
    The MP fragment maximum size of 256 bytes is recommended.

  5. Run drop-timeout time-number

    A timeout period is set for an MP interface to reassemble upstream MP packets.

  6. Perform the following steps to restart the interface:
    1. Run shutdown

      The interface is shut down.

    2. Run commit

      The configuration is committed.

    3. Run undo shutdown

      The interface is restarted.

    NOTE:

    The shutdown, commit, and undo shutdown commands must be run in sequence so that the preceding configuration can take effect after the interface is restarted.

  7. Run commit

    The configuration is committed.

(Optional) Improving MP Link Reliability

This section describes how to configure flapping damping and the minimum number of Point-to-Point-Protocol (PPP) links allowed for a Multilink Point-to-Point Protocol (MP) link to improve MP link reliability.

Context

The flapping status of an MP link reflects the bandwidth stability of the MP link. In a specified monitoring period, if the number of flapping times of an MP member link exceeds the specified maximum number of flapping times, configure flapping damping for MP member links.
NOTE:

After an MP member link is dampened, the interfaces on the two ends of the member link enter the damping state. The data link layer status of the end interfaces for the member link is DOWN (damping) in the display interface mp-group command output.

The minimum number of PPP links allowed for an MP link determines the minimum bandwidth of the MP link. To meet bandwidth requirements, you can configure the minimum number of PPP links allowed for an MP link.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface mp-group number

    An MP-Group interface is created, and the MP-Group interface view is displayed.

  3. Run ppp mp damping [ detect-time detect-time flapping-count flapping-count damping-time damping-time ]

    Flapping damping is configured for the member links of the MP link.

  4. Run ppp mp threshold-least number

    The minimum number of PPP links allowed for the MP link is set.

  5. Restart the MP-Group interface.
    1. Run shutdown

      The interface is shut down.

    2. Run commit

      The configuration is committed.

    3. Run undo shutdown

      The interface is restarted.

    NOTE:

    The shutdown, commit, and undo shutdown commands must be run in sequence so that the preceding configuration can take effect after the interface is restarted.

  6. Run commit

    The configuration is committed.

Verifying the MP Configuration

After configuring the Multilink Point-to-Point Protocol (MP), verify the configuration.

Prerequisites

MP has been configured.

Procedure

  • Run the display interface mp-group [ number ] command to check the status of and traffic statistics on an MP-Group interface.
  • Run the display ppp mp [ interface interface-type interface-number ] command to check information about member interfaces of an MP-Group interface and statistics about the packets sent and received by the MP-Group interface.
  • Run the display ppp error-packet interface-type interface-number command to check statistics about error packets received by a Point-to-Point Protocol (PPP) interface.
  • Run the display time-delay-detect status command to check the transmission delays of MP-Group member links.

Example

Run the display interface mp-group command. The command output shows the status of the specified MP-Group interface.

<HUAWEI> display interface mp-group 0/1/1
Mp-group0/1/1 current state : UP (ifindex: 291)                                                                                     
Line protocol current state : UP                                                                                                    
Last line protocol up time : 2013-08-07 09:41:29                                                                                    
Description:                                                                                                                        
Route Port,The Maximum Transmit Unit is 1500                                                                                        
Internet Address is 1.1.1.1/24                                                                                                     
Link layer protocol is PPP                                                                                                          
LCP opened, MP opened, IPCP opened                                                                                                  
PPP negotiated peer ip address is 1.1.1.2                                                                                          
Physical is MP, baudrate is 1984000 bps                                                                                             
Current system time: 2013-08-07 10:06:46                                                                                            
  Traffic statistics:                                                                                                               
    Last 300 seconds input rate 64 bits/sec, 1 packets/sec                                                                          
    Last 300 seconds output rate 64 bits/sec, 1 packets/sec                                                                         
    Input: 119070986 packets, 11910887082 bytes 
           0 errors, 0 drops                                                                                                        
    Output: 119071022 packets, 11918735043 bytes                                                                                    
            0 errors, 0 drops                                                                                                       
    Last 300 seconds input utility rate:  0.01%                                                                                     
    Last 300 seconds output utility rate: 0.01%    

Run the display ppp mp command. The command output shows information about the member interfaces of the specified MP-Group interface and statistics about the packets sent and received by the MP-Group interface.

<HUAWEI> display ppp mp interface mp-group 0/1/1
Mp-group is Mp-group0/1/1
 ===========Sublinks status begin======           
 Serial0/1/1:1 physical UP,protocol UP        
 Serial0/1/1:2 physical UP,protocol UP            
 Serial0/1/1:3 physical UP,protocol DOWN(damping)        
 Serial0/1/1:4 physical UP,protocol DOWN     
 ===========Sublinks status end========       
 Bundle Multilink, 2 member, slot 1, Master link is Mp-group0/1/1 
  0 lost fragments, 0 reordered, 0 unassigned, 0 interleaved,
 sequence 0/0 rcvd/sent                 
 The bundled son channels are:           
      Serial0/1/1:1                    
      Serial0/1/1:2

Run the display ppp error-packet command. The command output shows statistics about the error packets received by the specified PPP interface.

<HUAWEI> display ppp error-packet Serial 0/1/1:20
Error packet information:
---------------------------------------------------------------------
LenthErr    :   0    PktIDErr    :   3
NakErr      :  12    AckErr      :   0
RejErr      :   0    CiLenErr    :   0
UnknowPkt   :   1  
---------------------------------------------------------------------

Run the display time-delay-detect status command. The command output shows the transmission delays of MP-Group member links.

[~HUAWEI] displaytime-delay-detect status interface Mp-group 0/1/0
Time delay detect statistics:
Serial0/1/0/1:1 Max time delay in history:1000000000
    Last 3 records:1000000000,1000000000,1000000000
    Send detect packets:5, Receive detect packets:0
Serial0/1/0/3:1 Max time delay in history:1000000000
    Last 3 records:1000000000,1000000000,1000000000
    Send detect packets:5, Receive detect packets:0  
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Updated: 2019-01-02

Document ID: EDOC1100058399

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