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AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R010 CLI-based Configuration Guide - MPLS

This document describes MPLS features on the device and provides configuration procedures and configuration examples.

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Example for Configuring SRLG Based on CR-LSP Hot Standby

Example for Configuring SRLG Based on CR-LSP Hot Standby

Networking Requirements

As shown in Figure 4-54, An MPLS TE tunnel is set up between LSRA and LSRC, with the path LSRA -> LSRB -> LSRC.

The link LSRA -> LSRB and the link LSRA -> LSRE are in the same SRLG (SRLG1 for example); the link LSRC -> LSRB and the link LSRC -> LSRE are in the same SLRG (SRLG2 for example).

To improve reliability, a hot-standby CR-LSP needs to be established and the links of the bypass CR-LSP and primary tunnel must be in different SRLGs.

Figure 4-54  Networking for configuring SRLG based on CR-LSP hot standby

Configuration Roadmap

The configuration roadmap is as follows:

  1. Assign an IP address to each interface and configure OSPF to ensure that there are reachable routes between LSRs.

  2. Configure an ID for each LSR and globally enable MPLS, MPLS TE, RSVP-TE, CSPF on each node and interface, and enable OSPF TE.

  3. On the ingress node of the primary tunnel, create a tunnel interface, and specify the IP address, tunneling protocol, destination IP address, tunnel ID, and dynamic signaling protocol RSVP-TE for the tunnel interface. The explicit path is LSRA -> LSRB -> LSRC.

  4. Configure SRLG numbers for SRLG member interfaces.

  5. Configure the SRLG path calculation mode on the ingress node of the primary tunnel.

  6. Configure a hot-standby CR-LSP on the ingress node of the primary tunnel.

Procedure

  1. Assign an IP address to each interface and configure OSPF.

    # Configure LSRA. The configurations of LSRB, LSRC, LSRE, and LSRF are similar to the configuration of LSRA, and are not mentioned here.

    <Huawei> system-view
[Huawei] sysname LSRA
[LSRA] interface gigabitethernet 1/0/0
[LSRA-GigabitEthernet1/0/0] ip address 172.1.1.1 255.255.255.0
[LSRA-GigabitEthernet1/0/0] quit
[LSRA] interface gigabitethernet 2/0/0
[LSRA-GigabitEthernet2/0/0] ip address 172.6.1.1 255.255.255.0
[LSRA-GigabitEthernet2/0/0] quit
[LSRA] interface gigabitethernet 3/0/0
[LSRA-GigabitEthernet3/0/0] ip address 172.4.1.1 255.255.255.0
[LSRA-GigabitEthernet3/0/0] quit
[LSRA] interface loopback 1
[LSRA-LoopBack1] ip address 1.1.1.9 255.255.255.255
[LSRA-LoopBack1] quit
[LSRA] ospf 1
[LSRA-ospf-1] area 0
[LSRA-ospf-1-area-0.0.0.0] network 1.1.1.9 0.0.0.0
[LSRA-ospf-1-area-0.0.0.0] network 172.1.1.0 0.0.0.255
[LSRA-ospf-1-area-0.0.0.0] network 172.4.1.0 0.0.0.255
[LSRA-ospf-1-area-0.0.0.0] network 172.6.1.0 0.0.0.255
[LSRA-ospf-1-area-0.0.0.0] quit
[LSRA-ospf-1] quit

    After the configurations are complete, run the display ip routing-table command on each LSR. You can see that the LSRs learn the routes to Loopback1 of each other. The display on LSRA is used as an example.

    [LSRA] display ip routing-table
Route Flags:
R - relay, D - download to fib                                     
------------------------------------------------------------------------------  
Routing Tables: Public                                                          
         Destinations : 21       Routes : 23                                    
                                                                                
Destination/Mask    Proto   Pre  Cost      Flags NextHop         Interface      
                                                                                
        1.1.1.9/32  Direct  0    0           D   127.0.0.1       LoopBack1      
        2.2.2.9/32  OSPF    10   1           D   172.1.1.2       GigabitEthernet1/0/0
        3.3.3.9/32  OSPF    10   2           D   172.1.1.2       GigabitEthernet1/0/0
                    OSPF    10   2           D   172.6.1.2       GigabitEthernet2/0/0
                    OSPF    10   2           D   172.4.1.2       GigabitEthernet3/0/0
        5.5.5.9/32  OSPF    10   1           D   172.4.1.2       GigabitEthernet3/0/0
        6.6.6.9/32  OSPF    10   1           D   172.6.1.2       GigabitEthernet2/0/0
      127.0.0.0/8   Direct  0    0           D   127.0.0.1       InLoopBack0    
      127.0.0.1/32  Direct  0    0           D   127.0.0.1       InLoopBack0    
127.255.255.255/32  Direct  0    0           D   127.0.0.1       InLoopBack0    
      172.1.1.0/24  Direct  0    0           D   172.1.1.1       GigabitEthernet1/0/0
      172.1.1.1/32  Direct  0    0           D   127.0.0.1       GigabitEthernet1/0/0
    172.1.1.255/32  Direct  0    0           D   127.0.0.1       GigabitEthernet1/0/0
      172.2.1.0/24  OSPF    10   2           D   172.1.1.2       GigabitEthernet1/0/0
      172.5.1.0/24  OSPF    10   2           D   172.4.1.2       GigabitEthernet3/0/0
      172.4.1.0/24  Direct  0    0           D   172.6.1.1       GigabitEthernet3/0/0
      172.4.1.1/32  Direct  0    0           D   127.0.0.1       GigabitEthernet3/0/0
    172.4.1.255/32  Direct  0    0           D   127.0.0.1       GigabitEthernet3/0/0
      172.6.1.0/24  Direct  0    0           D   172.6.1.1       GigabitEthernet2/0/0
      172.6.1.1/32  Direct  0    0           D   127.0.0.1       GigabitEthernet2/0/0
    172.6.1.255/32  Direct  0    0           D   127.0.0.1       GigabitEthernet2/0/0
      172.7.1.0/24  OSPF    10   2           D   172.6.1.2       GigabitEthernet2/0/0
255.255.255.255/32  Direct  0    0           D   127.0.0.1       InLoopBack0

  2. Configure basic MPLS functions and enable MPLS TE, RSVP-TE, and CSPF.

    # Configure LSRA. The configurations of LSRB, LSRC, LSRE, and LSRF are similar to the configuration of LSRA, and are not mentioned here. CSPF only needs to be configured on the ingress node of the primary tunnel.

    [LSRA] mpls lsr-id 1.1.1.9
[LSRA] mpls
[LSRA-mpls] mpls te
[LSRA-mpls] mpls rsvp-te
[LSRA-mpls] mpls te cspf
[LSRA-mpls] quit
[LSRA] interface gigabitethernet 1/0/0
[LSRA-GigabitEthernet1/0/0] mpls
[LSRA-GigabitEthernet1/0/0] mpls te
[LSRA-GigabitEthernet1/0/0] mpls rsvp-te
[LSRA-GigabitEthernet1/0/0] quit
[LSRA] interface gigabitethernet 2/0/0
[LSRA-GigabitEthernet2/0/0] mpls
[LSRA-GigabitEthernet2/0/0] mpls te
[LSRA-GigabitEthernet2/0/0] mpls rsvp-te
[LSRA-GigabitEthernet2/0/0] quit
[LSRA] interface gigabitethernet 3/0/0
[LSRA-GigabitEthernet3/0/0] mpls
[LSRA-GigabitEthernet3/0/0] mpls te
[LSRA-GigabitEthernet3/0/0] mpls rsvp-te
[LSRA-GigabitEthernet3/0/0] quit

  3. Configure OSPF TE.

    # Configure LSRA. The configurations of LSRB, LSRC, LSRE, and LSRF are similar to the configuration of LSRA, and are not mentioned here. 

    [LSRA] ospf
[LSRA-ospf-1] opaque-capability enable
[LSRA-ospf-1] area 0
[LSRA-ospf-1-area-0.0.0.0] mpls-te enable
[LSRA-ospf-1-area-0.0.0.0] quit
[LSRA-ospf-1] quit

  4. On LSRA, create an MPLS TE tunnel for the primary CR-LSP.

    # Configure the explicit path of the primary CR-LSP.

    [LSRA] explicit-path pri-path
[LSRA-explicit-path-pri-path] next hop 172.1.1.2
[LSRA-explicit-path-pri-path] next hop 172.2.1.2
[LSRA-explicit-path-pri-path] next hop 3.3.3.9
[LSRA-explicit-path-pri-path] quit

    # Configure the MPLS TE tunnel interface of the primary CR-LSP.

    [LSRA] interface tunnel 0/0/1
[LSRA-Tunnel0/0/1] ip address unnumbered interface loopBack 1
[LSRA-Tunnel0/0/1] tunnel-protocol mpls te
[LSRA-Tunnel0/0/1] destination 3.3.3.9
[LSRA-Tunnel0/0/1] mpls te tunnel-id 100
[LSRA-Tunnel0/0/1] mpls te path explicit-path pri-path
[LSRA-Tunnel0/0/1] mpls te commit
[LSRA-Tunnel0/0/1] quit

    Run the display interface tunnel 0/0/1 command on LSRA. You can see that the tunnel status is Up.

    [LSRA] display interface tunnel 0/0/1
Tunnel0/0/1 current state : UP                                                  
Line protocol current state : UP                                                
Last line protocol up time : 2013-01-22 16:57:00                                
Description:
...

  5. Configure SRLG.

    Configure SRLG1 for links LSRA -> LSRB and LSRA -> LSRE, and SRLG2 for links LSRC -> LSRB and LSRC -> LSRE. Configure the SRLG path calculation mode on the ingress node LSRA of the primary tunnel.

    # Configure LSRA.

    [LSRA] interface gigabitethernet 1/0/0
[LSRA-GigabitEthernet1/0/0] mpls te srlg 1
[LSRA-GigabitEthernet1/0/0] quit
[LSRA] interface gigabitethernet 3/0/0
[LSRA-GigabitEthernet3/0/0] mpls te srlg 1
[LSRA-GigabitEthernet3/0/0] quit

    # Configure LSRB.

    [LSRB] interface gigabitethernet 2/0/0
[LSRB-GigabitEthernet2/0/0] mpls te srlg 2
[LSRB-GigabitEthernet2/0/0] quit

    # Configure LSRE.

    [LSRE] interface gigabitethernet 2/0/0
[LSRE-GigabitEthernet2/0/0] mpls te srlg 2
[LSRE-GigabitEthernet2/0/0] quit

    # Configure the SRLG path calculation mode on LSRA.

    [LSRA] mpls
[LSRA-mpls] mpls te srlg path-calculation strict
[LSRA-mpls] quit

    Run the display mpls te srlg all command to view SRLG information and the interfaces that belong to the SRLG. The display on LSRA is used as an example.

    [LSRA] display mpls te srlg all
Total SRLG supported : 32                                                       
Total SRLG configured : 2                                                       
SRLG    1:           GE1/0/0             GE3/0/0

    Run the display mpls te link-administration srlg-information to view SRLGs to which the interfaces belong. The display on LSRA is used as an example.

    [LSRA] display mpls te link-administration srlg-information
                                                                               
 SRLGs on GigabitEthernet1/0/0 :                                                
              1                                                                 
                                                                                
 SRLGs on GigabitEthernet3/0/0 :                                                
              1

    Run the display mpls te cspf tedb srlg command to view TEDB information of the specified SRLG. 

    [LSRA] display mpls te cspf tedb srlg 1
Interface-Address   IGP-Type            Area                                    
172.1.1.1           OSPF                0                                       
172.4.1.1           OSPF                0                     
    [LSRA] display mpls te cspf tedb srlg 2
Interface-Address   IGP-Type            Area                                    
172.2.1.1           OSPF                0                                       
172.5.1.1           OSPF                0

  6. Configure a hot-standby CR-LSP on the ingress node.

    # Configure LSRA.

    [LSRA] interface tunnel 0/0/1
[LSRA-Tunnel0/0/1] mpls te backup hot-standby
[LSRA-Tunnel0/0/1] mpls te commit
[LSRA-Tunnel0/0/1] quit

    Run the display mpls te tunnel-interface command on LSRA. You can see that the hot-standby CR-LSP has been established.

    [LSRA] display mpls te tunnel-interface
    ----------------------------------------------------------------            
                               Tunnel0/0/1                                      
    ----------------------------------------------------------------            
    Tunnel State Desc   :  UP                                                   
    Active LSP          :  Primary LSP                                          
    Session ID          :  100                                                  
    Ingress LSR ID      :  1.1.1.9          Egress LSR ID:  3.3.3.9             
    Admin State         :  UP               Oper State   :  UP                  
    Primary LSP State      : UP                                                 
      Main LSP State       : READY               LSP ID  : 54                   
    Hot-Standby LSP State  : UP                                                 
      Main LSP State       : READY               LSP ID  : 32780

    Run the display mpls te hot-standby state interface tunnel 0/0/1 command on LSRA to view the hot-standby CR-LSP.

    [LSRA] display mpls te hot-standby state interface tunnel 0/0/1
(s): same path
---------------------------------------------------------------------           
Verbose information about the Tunnel0/0/1 hot-standby state                     
---------------------------------------------------------------------           
session id                               : 100                                  
main LSP token                           : 0x51                                 
hot-standby LSP token                    : 0x4f                                 
HSB switch result                        : Primary LSP                          
HSB switch reason                        : -                                    
WTR config time                          : 10s                                  
WTR remain time                          : -                                    
using overlapped path                    : no

  7. Verify the configuration.

    # After the configurations are complete, run the display mpls te tunnel path command on LSRA to view nodes that the primary CR-LSP and backup CR-LSP pass.

    [LSRA] display mpls te tunnel path
 Tunnel Interface Name : Tunnel0/0/1                                            
 Lsp ID : 1.1.1.9 :100 :32780                                                   
 Hop Information                                                                
  Hop 0   172.6.1.1                                                             
  Hop 1   172.6.1.2  Label 1034                                                 
  Hop 2   6.6.6.9  Label 1034                                                   
  Hop 3   172.7.1.1                                                             
  Hop 4   172.7.1.2  Label 3                                                 
  Hop 5   3.3.3.9  Label 3                                                   
                                                                                
 Tunnel Interface Name : Tunnel0/0/1                                            
 Lsp ID : 1.1.1.9 :100 :54                                                      
 Hop Information                                                                
  Hop 0   172.1.1.1                                                             
  Hop 1   172.1.1.2  Label 1071                                                 
  Hop 2   2.2.2.9  Label 1071                                                   
  Hop 3   172.2.1.1                                                             
  Hop 4   172.2.1.2  Label 3                                                 
  Hop 5   3.3.3.9  Label 3

    # Run the shutdown command on GE2/0/0 of LSRA.

    [LSRA] interface gigabitethernet 2/0/0
[LSRA-GigabitEthernet2/0/0] shutdown
[LSRA-GigabitEthernet2/0/0] quit

    # Run the display mpls te hot-standby state interface tunnel 0/0/1 command on LSRA. You can see that the hot-standby LSP token is 0x0. This means that the hot-standby LSP is not set up even though there are paths for setting up the hot-standby LSP. 

    [LSRA] display mpls te hot-standby state interface tunnel 0/0/1
---------------------------------------------------------------------           
Verbose information about the Tunnel0/0/1 hot-standby state                     
---------------------------------------------------------------------           
session id                               : 100                                  
main LSP token                           : 0x51                                 
hot-standby LSP token                    : 0x0                                  
HSB switch result                        : Primary LSP                          
HSB switch reason                        : -                                    
WTR config time                          : 10s                                  
WTR remain time                          : -                                    
using overlapped path                    : -

Configuration Files

  • LSRA configuration file

    #
 sysname LSRA
#
mpls lsr-id 1.1.1.9                                                             
mpls                                                                            
 mpls te                                                                        
 mpls te srlg path-calculation strict 
 mpls rsvp-te                                                                   
 mpls te cspf 
#
explicit-path pri-path                                                          
 next hop 172.1.1.2                                                             
 next hop 172.2.1.2                                                             
 next hop 3.3.3.9 
#    
interface GigabitEthernet1/0/0
 ip address 172.1.1.1 255.255.255.0
 mpls
 mpls te
 mpls te srlg 1
 mpls rsvp-te
#    
interface GigabitEthernet2/0/0
 ip address 172.6.1.1 255.255.255.0
 mpls
 mpls te
 mpls rsvp-te
#
interface GigabitEthernet3/0/0
 ip address 172.4.1.1 255.255.255.0
 mpls
 mpls te
 mpls te srlg 1
 mpls rsvp-te
#
interface LoopBack1
 ip address 1.1.1.9 255.255.255.255
#
interface Tunnel0/0/1
 ip address unnumbered interface LoopBack1
 tunnel-protocol mpls te
 destination 3.3.3.9
 mpls te tunnel-id 100
 mpls te record-route label
 mpls te path explicit-path pri-path
 mpls te backup hot-standby                                                     
 mpls te commit
#
ospf 1
 opaque-capability enable
 area 0.0.0.0
  network 1.1.1.9 0.0.0.0                                                       
  network 172.1.1.0 0.0.0.255                                                   
  network 172.4.1.0 0.0.0.255
  network 172.6.1.0 0.0.0.255
  mpls-te enable
#
return

  • LSRB configuration file

    #
 sysname LSRB
# 
mpls lsr-id 2.2.2.9
mpls
 mpls te
 mpls rsvp-te
#
interface GigabitEthernet1/0/0
 ip address 172.1.1.2 255.255.255.0
 mpls
 mpls te
 mpls rsvp-te
# 
interface GigabitEthernet2/0/0
 ip address 172.2.1.1 255.255.255.0
 mpls
 mpls te
 mpls te srlg 2
 mpls rsvp-te
#
interface LoopBack1
 ip address 2.2.2.9 255.255.255.255
# 
ospf 1
 opaque-capability enable
 area 0.0.0.0
  network 2.2.2.9 0.0.0.0                                                       
  network 172.1.1.0 0.0.0.255                                                   
  network 172.2.1.0 0.0.0.255                                                   
  mpls-te enable
#
return

  • LSRC configuration file

    #
 sysname LSRC
#
mpls lsr-id 3.3.3.9
mpls
 mpls te
 mpls rsvp-te
#
interface GigabitEthernet1/0/0
 ip address 172.2.1.2 255.255.255.0
 mpls
 mpls te
 mpls rsvp-te
#
interface GigabitEthernet2/0/0
 ip address 172.5.1.2 255.255.255.0
 mpls
 mpls te
 mpls rsvp-te
#
interface GigabitEthernet3/0/0
 ip address 172.7.1.2 255.255.255.0
 mpls
 mpls te
 mpls rsvp-te
#
interface LoopBack1
 ip address 3.3.3.9 255.255.255.255
#
ospf 1
 opaque-capability enable
 area 0.0.0.0
  network 3.3.3.9 0.0.0.0                                                       
  network 172.2.1.0 0.0.0.255                                                   
  network 172.5.1.0 0.0.0.255                                                   
  network 172.7.1.0 0.0.0.255
  mpls-te enable
#
return

  • LSRE configuration file

    #
 sysname LSRE
#
mpls lsr-id 5.5.5.9
mpls
 mpls te
 mpls rsvp-te
#
interface GigabitEthernet1/0/0
 ip address 172.4.1.2 255.255.255.0
 mpls
 mpls te
 mpls rsvp-te
#
interface GigabitEthernet2/0/0
 ip address 172.5.1.1 255.255.255.0
 mpls
 mpls te
 mpls te srlg 2
 mpls rsvp-te
#
interface LoopBack1
 ip address 5.5.5.9 255.255.255.255
#
ospf 1
 opaque-capability enable
 area 0.0.0.0
  network 5.5.5.9 0.0.0.0                                                       
  network 172.4.1.0 0.0.0.255                                                   
  network 172.5.1.0 0.0.0.255
  mpls-te enable
#
return

  • LSRF configuration file

    #
 sysname LSRF
#
mpls lsr-id 6.6.6.9
mpls
 mpls te
 mpls rsvp-te
#
interface GigabitEthernet1/0/0
 ip address 172.6.1.2 255.255.255.0
 mpls
 mpls te
 mpls rsvp-te
#
interface GigabitEthernet2/0/0
 ip address 172.7.1.1 255.255.255.0
 mpls
 mpls te
 mpls rsvp-te
#
interface LoopBack1
 ip address 6.6.6.9 255.255.255.255
#
ospf 1
 opaque-capability enable
 area 0.0.0.0
  network 6.6.6.9 0.0.0.0                                                       
  network 172.6.1.0 0.0.0.255                                                   
  network 172.7.1.0 0.0.0.255
  mpls-te enable
#
return
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Updated: 2023-08-07

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