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NE40E V800R010C00 Configuration Guide - MPLS 01

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Disabling the Rerouting Function

Disabling the Rerouting Function

The rerouting function enables MPLS TE to re-select another path for LSP reestablishment in the case that the original path fails. This function is enabled by default. This section describes how to disable it.

Usage Scenario

If an LSP path fails, the LSP goes Down. The rerouting function allows MPLS TE to re-select another available path for LSP establishment. However, this may cause traffic congestion on the re-selected path. In this situation, run the mpls te reroute disable command to disable the rerouting function. The path over which the Up LSP is established then functions as a constraint path. Even if the path fails, MPLS TE still uses it for LSP reestablishment. However, manual intervention (for example, manually modifying the LSP configuration or triggering LSP rerouting) will delete the constraint path. After a new LSP goes up, the new LSP path serves as the new constraint path.

Context

Before disabling the rerouting function, complete the following tasks:

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Run:

    interface tunnel tunnel-number

    The tunnel interface view of the tunnel to be established is displayed.

  3. Run:

    mpls te reroute disable

    The rerouting function is disabled.

  4. Run:

    commit

    The configuration is committed.

Checking the Configurations

  • Run the display mpls te tunnel-interface command to check the tunnel interface information on the local node.

  • Run the display mpls te tunnel locked-path command to check the locked path attributes of a TE tunnel on the local node.

Run the display mpls te tunnel-interface command. The Reroute Flag field shows that the rerouting function is disabled.

<HUAWEI> display mpls te tunnel-interface
    Tunnel Name       : Tunnel1
    Signalled Tunnel Name: -
    Tunnel State Desc : CR-LSP is Up
    Tunnel Attributes   :     
    Active LSP          : Primary LSP                                       
    Traffic Switch      : - 
    Session ID          : 1
    Ingress LSR ID      : 1.1.1.9               Egress LSR ID: 4.4.4.9
    Admin State         : UP                    Oper State   : UP
    Signaling Protocol  : RSVP
    FTid                : 1
    Tie-Breaking Policy : None                  Metric Type  : None
    Bfd Cap             : None                  
    Reopt               : Disabled              Reopt Freq   : -              
    Auto BW             : Disabled              Threshold    : 0 percent
    Current Collected BW: 0 kbps                Auto BW Freq : 0
    Min BW              : 0 kbps                Max BW       : 0 kbps
    Offload             : Disabled              Offload Freq : - 
    Low Value           : -                     High Value   : - 
    Readjust Value      : - 
    Offload Explicit Path Name: 
    Tunnel Group        : -                                              
    Interfaces Protected: -
    Excluded IP Address : -
    Referred LSP Count  : 0  
    Primary Tunnel      : -                     Pri Tunn Sum : -              
    Backup Tunnel       : -                                                    
    Group Status        : -                     Oam Status   : -             
    IPTN InLabel        : -                     Tunnel BFD Status : -                               
    BackUp LSP Type     : None                  BestEffort   : Disabled
    Secondary HopLimit  : -
    BestEffort HopLimit  : -
    Secondary Explicit Path Name: -
    Secondary Affinity Prop/Mask: 0x0/0x0
    BestEffort Affinity Prop/Mask: 0x0/0x0  
    IsConfigLspConstraint: -
    Hot-Standby Revertive Mode:  Revertive
    Hot-Standby Overlap-path:  Disabled
    Hot-Standby Switch State:  CLEAR
    Bit Error Detection:  Disabled
    Bit Error Detection Switch Threshold:  -
    Bit Error Detection Resume Threshold:  -
    Ip-Prefix Name    : -
    P2p-Template Name : -
    PCE Delegate      : Only status report      LSP Control Status : Local control
    Entropy Label       :None 
    Associated Tunnel Group ID: -                 Associated Tunnel Group Type: -
    Auto BW Remain Time : 200 s   Reopt Remain Time  : 100 s

    Primary LSP ID      : 1.1.1.9:19
    LSP State           : UP                    LSP Type     : Primary
    Setup Priority      : 7                     Hold Priority: 7
    IncludeAll          : 0x0
    IncludeAny          : 0x0
    ExcludeAny          : 0x0
    Affinity Prop/Mask  : 0x0/0x0               Resv Style   :  SE
    Configured Bandwidth Information:
    CT0 Bandwidth(Kbit/sec): 20000           CT1 Bandwidth(Kbit/sec): 0
    CT2 Bandwidth(Kbit/sec): 0               CT3 Bandwidth(Kbit/sec): 0
    CT4 Bandwidth(Kbit/sec): 0               CT5 Bandwidth(Kbit/sec): 0
    CT6 Bandwidth(Kbit/sec): 0               CT7 Bandwidth(Kbit/sec): 0
    Actual Bandwidth Information:
    CT0 Bandwidth(Kbit/sec): 20000           CT1 Bandwidth(Kbit/sec): 0
    CT2 Bandwidth(Kbit/sec): 0               CT3 Bandwidth(Kbit/sec): 0
    CT4 Bandwidth(Kbit/sec): 0               CT5 Bandwidth(Kbit/sec): 0
    CT6 Bandwidth(Kbit/sec): 0               CT7 Bandwidth(Kbit/sec): 0
    Explicit Path Name  : -                                Hop Limit: -
    Record Route        : Disabled              Record Label : Disabled
    Route Pinning       : Disabled
    FRR Flag            : Disabled
    IdleTime Remain     : -
    BFD Status          : -
    Soft Preemption     : Enabled 
    Reroute Flag        : Disabled
    Pce Flag            : Normal

Run the display mpls te tunnel locked-path command. The command output shows the locked path attributes after the rerouting function is disabled.

<HUAWEI> display mpls te tunnel locked-path
 Tunnel Interface Name : Tunnel1
 Lsp ID : 1.1.1.1 :1 :610
 Locked-Hop Information
  Hop 1   10.1.1.1
  Hop 2   10.1.1.2
  Hop 3   2.2.2.2
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Updated: 2018-07-12

Document ID: EDOC1100028530

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