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NE40E V800R010C10SPC500 Commissioning Guide

This is NE40E V800R010C10SPC500 Commissioning Guide
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Commissioning MPLS LDP

Commissioning MPLS LDP

Users can choose to configure a type of MPLS tunnel based on the actual network planning. This section describes how to commission MPLS LDP.

Prerequisites

The following configurations are complete and the device is running normally:

Context

On the network shown in Figure 6-7, MPLS LDP is configured on the network.

Figure 6-7 Typical networking for commissioning MPLS LDP

Procedure

  1. Run the display mpls ldp peer command to view LDP peer information.

    <HUAWEI> display mpls ldp peer
    
     LDP Peer Information in Public network
     A '*' before a peer means the peer is being deleted.
     -------------------------------------------------------------------------------
     PeerID                 TransportAddress               DiscoverySource
     -------------------------------------------------------------------------------
     2.2.2.2:0              2.2.2.2                        GigabitEthernet2/0/0
     -------------------------------------------------------------------------------
     TOTAL: 1 Peer(s) Found.                                                      
    

    Check whether the number of LDP peers is correct.

  2. Run the display mpls ldp session command to check information about the session between LDP peers.

    <HUAWEI> display mpls ldp session
    
     LDP Session(s) in Public Network
     Codes: LAM(Label Advertisement Mode), SsnAge Unit(DDD:HH:MM)
     A '*' before a session means the session is being deleted.
    --------------------------------------------------------------------------
     PeerID             Status      LAM  SsnRole  SsnAge       KASent/Rcv
    --------------------------------------------------------------------------
     2.2.2.2:0          Operational DU   Passive  000:00:01   5/5
    --------------------------------------------------------------------------
    TOTAL: 1 Session(s) Found.
    

    The Status field in the preceding command output is commonly displayed as Operational, indicating that an LDP session has been established. The LAM field is commonly displayed as DU, indicating that the label distribution mode is Downstream Unsolicited. The SsnAge field can be displayed as Passive, indicating the responder of an LDP session, or as Active, indicating the initiator of an LDP session.

  3. Run the display mpls ldp interface command on the commissioning device to view information about the interfaces enabled with MPLS LDP.

    <HUAWEI> display mpls ldp interface
         LDP Interface Information in Public Network
     Codes:LAM(Label Advertisement Mode), IFName(Interface name)
     A '*' before an interface means the entity is being deleted.
    ------------------------------------------------------------------------
    IFName                 Status   LAM    TransportAddress   HelloSent/Rcv 
    ------------------------------------------------------------------------
    GE1/0/0                Active   DU     1.1.1.1           21/20     
    

    Check whether LDP-enabled interfaces are correctly configured and the number of LDP-enabled interfaces is correct.

  4. Run the display mpls ldp lsp command on the commissioning device to view information about the outbound interfaces of LDP LSPs, next-hop addresses, number of LDP LSPs, and types of LDP LSPs.

    <HUAWEI> display mpls ldp lsp
    
     LDP LSP Information
     -------------------------------------------------------------------------------
     DestAddress/Mask   In/OutLabel    UpstreamPeer    NextHop          OutInterface
     -------------------------------------------------------------------------------
    *1.1.1.1/32         Liberal/10441                  DS/2.2.2.2
     1.1.1.1/32         3/NULL         2.2.2.2         10.0.0.1         Loop0
     2.2.2.2/32         NULL/3         -               192.168.1.2       GigabitEthernet1/0/0
     2.2.2.2/32         29816/3        2.2.2.2         192.168.1.2       GigabitEthernet1/0/0
     -------------------------------------------------------------------------------
     TOTAL: 3 Normal LSP(s) Found.
     TOTAL: 1 Liberal LSP(s) Found.
     TOTAL: 0 Frr LSP(s) Found.
     A '*' before an LSP means the LSP is not established
     A '*' before a Label means the USCB or DSCB is stale
     A '*' before a UpstreamPeer means the session is in GR state
     A '*' before a DS means the session is in GR state
     A '*' before a NextHop means the LSP is FRR LSP
    

  5. Run the display mpls lsp command on the commissioning device to view LSP information.

    <HUAWEI> display mpls lsp
    ----------------------------------------------------------------------
                     LSP Information: LDP LSP
    ----------------------------------------------------------------------
    FEC                In/Out Label  In/Out IF                      Vrf Name
    1.1.1.1/32         3/NULL        GigabitEthernet1/0/0/-
    2.2.2.2/32         NULL/3        -/GigabitEthernet1/0/0
    2.2.2.2/32         1024/3        -/GigabitEthernet1/0/0
    10.1.1.0/24        3/NUL         GigabitEthernet1/0/0/-
    10.1.2.0/24        NULL/3        -/GigabitEthernet1/0/0
    10.1.2.0/24        1025/3        -/GigabitEthernet1/0/0

  6. Run the display mpls lsp verbose command on the commissioning device to view detailed LSP information.

    <HUAWEI> display mpls lsp verbose
    -------------------------------------------------------------------------------
                     LSP Information: LDP LSP
    -------------------------------------------------------------------------------
      No                  :  1
      VrfIndex            :
      Fec                 :  1.1.1.1/32
      Nexthop             :  10.0.0.1
      In-Label            :  3
      Out-Label           :  NULL
      In-Interface        :  ----------
      Out-Interface       :  ----------
      LspIndex            :  5105121
      Type                :  Primary
      OutSegmentIndex     :  0
      LsrType             :  Egress
      Outgoing token      :  0x0
      Label Operation     :  POP
      Mpls-Mtu            :  ------
      LspAge              :  215 sec
      Bfd-State           :  ------
    
      No                  :  2
      VrfIndex            :
      Fec                 :  2.2.2.2/32
      Nexthop             :  192.168.1.2
      In-Label            :  NULL
      Out-Label           :  3
      In-Interface        :  ----------
      Out-Interface       :  GigabitEthernet1/0/0
      LspIndex            :  5105122
      Type                :  Primary
      OutSegmentIndex     :  5200737
      LsrType             :  Ingress
      Outgoing token      :  0x0
      Label Operation     :  PUSH
      Mpls-Mtu            :  1500
      LspAge              :  208 sec
      Bfd-State           :  ------
    
      No                  :  3
      VrfIndex            :
      Fec                 :  2.2.2.2/32
      Nexthop             :  192.168.1.2
      In-Label            :  29816
      Out-Label           :  3
      In-Interface        :  ----------
      Out-Interface       :  GigabitEthernet1/0/0
      LspIndex            :  5105122
      Type                :  Primary
      OutSegmentIndex     :  5200737
      LsrType             :  Transit
      Outgoing token      :  0x0
      Label Operation     :  SWAP
      Mpls-Mtu            :  1500
      LspAge              :  208 sec
      Bfd-State           :  ------
                                                                           
    

    The command output in bold shows the LDP LSP lifetime. If the lifetime is too short, LSP flapping may occur.

  7. Run the ping lsp command to check the LSP connectivity and whether or not LSP forwarding is normal.

    <HUAWEI> ping lsp -a 1.1.1.1 ip 2.2.2.2 32
      LSP PING FEC: IPV4 PREFIX 2.2.2.2/32 : 100  data bytes, press CTRL_C to break
        Reply from 2.2.2.2: bytes=100 Sequence=1 time = 10 ms
        Reply from 2.2.2.2: bytes=100 Sequence=2 time = 5 ms
        Reply from 2.2.2.2: bytes=100 Sequence=3 time = 7 ms
        Reply from 2.2.2.2: bytes=100 Sequence=4 time = 6 ms
        Reply from 2.2.2.2: bytes=100 Sequence=5 time = 6 ms
    
      --- FEC: IPV4 PREFIX 2.2.2.2/32 ping statistics ---
        5 packet(s) transmitted
        5 packet(s) received
        0.00% packet loss
        round-trip min/avg/max = 5/6/10 ms

    This step is to check that the packets to loopback0 on router B are transmitted along an LSP. All the PEs related to services need to be checked.

Troubleshooting

If the established LDP session is in the Down state on an LDP-deployed network, complete the following:

  1. Check whether or not the interface on which the LDP session is established is shut down.

    Run the display this command in the interface view. If the command output contains shutdown, the interface is shut down.

    • If the interface is shut down, run the undo shutdown command in the interface view to start the interface.

    • If the interface is not shut down, go to Step 2.

  2. Check whether or not commands for deleting MPLS configurations have been executed.

    Run the display current-configuration command to check whether commands for deleting MPLS configurations are run.

    • If the command output does not contain mpls, MPLS is disabled.

    • If the command output does not contain mpls ldp, MPLS LDP is disabled.

    • If the command output does not contain mpls ldp remote peer, the session established with the remote LDP peer has been deleted.

    • If any command for deleting MPLS configurations has been run, run corresponding commands to restore the deleted configurations.

    • If no command for deleting MPLS configurations has been run but the fault persists, go to Step 3.

  3. Check that routes are available.

    Run the display ip routing-table command and check the Destination/Mask field in the command output to find out whether or not there is a route to the peer device. If there is no route to the peer device, the TCP connection cannot be established.

    • If the route to the peer device is unreachable, rectify the IGP route fault.

    • If the route to the peer device is reachable, go to Step 4.

  4. Check whether or not an LDP Hello-hold timer expires.

    Run the display mpls ldp interface command to check that both ends of the LDP session can send Hello messages. It is recommended that the display mpls ldp interface command be run every 3 seconds. If the statistics on sent or received messages keep unchanged, it indicates that the transmission of Hello messages is abnormal and the Hello-hold timer expires.

    • If the Hello-hold timer expires, see the troubleshooting of high CPU usage.

    • If the Hello-hold timer does not expire, go to Step 5.

  5. Check whether or not the LDP Keepalive-hold timer expires.

    Run the display mpls ldp session command to check that both ends of the LDP session can send Keepalive messages. It is recommended that the display mpls ldp session command be run every 5 seconds. If the statistics on sent or received messages remain unchanged, it indicates that the transmission of Keepalive messages is abnormal, and the Keepalive-hold timer expires.

    • If the Keepalive-hold timer expires, follow the procedure described in "The Ping Operation Fails" in the HUAWEI NetEngine40E Universal Service Router Troubleshooting to rectify the fault in message forwarding.

    • If the Keepalive-hold timer does not expire, go to Step 6.

  6. Collect the following information and contact Huawei technical support personnel:

    • Results of the preceding operation procedure
    • Configuration files, log files, and alarm files of the devices
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Updated: 2019-01-02

Document ID: EDOC1100055014

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