How to distinguish the path relationship between main and backup for MPLS TE hot backup?

How to distinguish the path relationship between main and backup for MPLS TE hot backup?

 

Q：How to distinguish the path relationship between main and backup for MPLS TE hot backup?

A：

You can input the command “display mpls te tunnel path” to get each path’s LSP ID. Generally, the min. ID is the main, and also can get back-upu lsp ID through the command “display mpls te tunnel-interface”

<msr>display mpls te tunnel path

 Tunnel Interface Name : Tunnel0

 Lsp ID : 1.1.1.1 :0                                              //LSPID is 0，so it’s the main

 Hop Information

  Hop   0           1.2.0.1

  Hop   1           1.2.0.2  Label 1024

  Hop   2           2.2.2.2

  Hop   3           2.3.0.2

  Hop   4           2.3.0.3  Label 3

  Hop   5           3.3.3.3

 

 Tunnel Interface Name : Tunnel0

 Lsp ID : 1.1.1.1 :2048                                        //LSPID is 2048，so it’s the backup. Hop Information

  Hop   0           1.4.0.1

  Hop   1           1.4.0.4  Label 1024

  Hop   2           4.4.4.4

  Hop   3           3.4.0.4

  Hop   4           3.4.0.3  Label 3

  Hop   5           3.3.3.3

<msr>

<msr>display mpls te tunnel-interface

  Tunnel Name          :  Tunnel0

  Tunnel Desc           :  Tunnel0 Interface

  Tunnel State Desc  :  Primary CR-LSP Up and HotBackup CR-LSP Up

  Tunnel Attributes    : 

    LSP ID                  :  1.1.1.1:0          //main path: LSP ID is 0

    Session ID            :  0

    Admin State          :  UP                    Oper State   :  UP

    Ingress LSR ID      :  1.1.1.1               Egress LSR ID:  3.3.3.3

    Signaling Prot         :  RSVP                  Resv Style   :  SE

    Class Type             :  CLASS 0               Tunnel BW    :  20 kbps

    Reserved BW          :  20 kbps

    Setup Priority          :  7                     Hold Priority:  7

    Affinity Prop/Mask   :  0x0/0x0

    Explicit Path Name  :  -

    Tie-Breaking Policy :  None

    Metric Type             :  None

    Loop Detection       :  Disabled

    Record Route         :  Enabled               Record Label :  Enabled

    FRR Flag                :  Disabled              BackUpBW Flag:  Not Supported

    BackUpBW Type     :  -                     BackUpBW     :  -

    Route Pinning          :  Disabled

    Retry Limit               :  5                     Retry Interval:  10 sec

    Reopt                      :  Disabled              Reopt Freq   :  -

    Back Up Type         :  HotStandBy

    Back Up LSPID       :  1.1.1.1:2048     //backup path LSP ID is 2048

    Auto BW                  :  Disabled              Auto BW Freq :  -

    Min BW                     :  -                     Max BW       :  -

    Current Collected BW:  -

    Interfaces Protected:  -

    VPN Bind Type          :  NONE

    VPN Bind Value         :  -

    Car Policy                  : Disabled

<msr>