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AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V300R003 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 LDP auto FRR

Example for configuring LDP auto FRR

Networking Requirements

On a complex and unstable network shown in Figure 3-33, MPLS LDP is deployed. The primary and backup LSPs are set up between LSRA and LSRC. The LSP from LSRA to LSRC is the primary LSP, while the LSP LSRA -> LSRB -> LSRC is the backup LSP. Services are interrupted and traffic is lost if a fault occurs on the primary LSP. Traffic must be quickly switched to the backup LSP upon a fault on the primary LSP.

Figure 3-33  Networking diagram of configuring LDP auto FRR

Configuration Roadmap

To meet the preceding requirements, configure LDP auto FRR. The configuration roadmap is as follows:

  1. Configure LDP FRR to support fast switchover to the backup LSP upon a fault on the primary LSP.

  2. Configure LDP auto FRR on a complex and unstable network. Enable IS-IS auto FRR on the LSR from which the protected traffic is originated.

Procedure

  1. Configure IP addresses for interfaces.

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

    <Huawei> system-view
[Huawei] sysname LSRA
[LSRA] interface loopback 0
[LSRA-LoopBack0] ip address 10.10.1.1 32
[LSRA-LoopBack0] quit
[LSRA] interface gigabitethernet 1/0/0
[LSRA-GigabitEthernet1/0/0] ip address 10.1.1.1 24
[LSRA-GigabitEthernet1/0/0] quit
[LSRA] interface gigabitethernet 2/0/0
[LSRA-GigabitEthernet2/0/0] ip address 10.1.2.1 24
[LSRA-GigabitEthernet2/0/0] quit

  2. Configure IS-IS to advertise the network segments connecting to interfaces on each node and to advertise the routes of hosts with LSR IDs.

    # Configure LSRA.

    [LSRA] isis 1
[LSRA-isis-1] network-entity 10.0000.0000.0001.00
[LSRA-isis-1] quit
[LSRA] interface gigabitethernet 1/0/0
[LSRA-GigabitEthernet1/0/0] isis enable 1
[LSRA-GigabitEthernet1/0/0] quit
[LSRA] interface gigabitethernet 2/0/0
[LSRA-GigabitEthernet2/0/0] isis enable 1
[LSRA-GigabitEthernet2/0/0] quit
[LSRA] interface loopback 0
[LSRA-LoopBack0] isis enable 1
[LSRA-LoopBack0] quit

    # Configure LSRB.

    [LSRB] isis 1
[LSRB-isis-1] network-entity 10.0000.0000.0002.00
[LSRB-isis-1] quit
[LSRB] interface gigabitethernet 1/0/0
[LSRB-GigabitEthernet1/0/0] isis enable 1
[LSRB-GigabitEthernet1/0/0] quit
[LSRB] interface gigabitethernet 2/0/0
[LSRB-GigabitEthernet2/0/0] isis enable 1
[LSRB-GigabitEthernet2/0/0] quit
[LSRB] interface loopback 0
[LSRB-LoopBack0] isis enable 1
[LSRB-LoopBack0] quit

    # Configure LSRC.

    [LSRC] isis 1
[LSRC-isis-1] network-entity 10.0000.0000.0003.00
[LSRC-isis-1] quit
[LSRC] interface gigabitethernet 1/0/0
[LSRC-GigabitEthernet1/0/0] isis enable 1
[LSRC-GigabitEthernet1/0/0] quit
[LSRC] interface gigabitethernet 2/0/0
[LSRC-GigabitEthernet2/0/0] isis enable 1
[LSRC-GigabitEthernet2/0/0] quit
[LSRC] interface gigabitethernet 3/0/0
[LSRC-GigabitEthernet3/0/0] isis enable 1
[LSRC-GigabitEthernet3/0/0] quit
[LSRC] interface loopback 0
[LSRC-LoopBack0] isis enable 1
[LSRC-LoopBack0] quit

    # Configure LSRD.

    [LSRD] isis 1
[LSRD-isis-1] network-entity 10.0000.0000.0004.00
[LSRD-isis-1] quit
[LSRD] interface gigabitethernet 1/0/0
[LSRD-GigabitEthernet1/0/0] isis enable 1
[LSRD-GigabitEthernet1/0/0] quit
[LSRD] interface loopback 0
[LSRD-LoopBack0] isis enable 1
[LSRD-LoopBack0] quit

  3. Configure global and interface-based MPLS and MPLS LDP on each node so that the network can forward MPLS traffic. Then check the LSP setup result.

    # Configure LSRA.

    [LSRA] mpls lsr-id 10.10.1.1
[LSRA] mpls
[LSRA-mpls] quit
[LSRA] mpls ldp
[LSRA-mpls-ldp] quit
[LSRA] interface gigabitethernet 1/0/0
[LSRA-GigabitEthernet1/0/0] mpls
[LSRA-GigabitEthernet1/0/0] mpls ldp
[LSRA-GigabitEthernet1/0/0] quit
[LSRA] interface gigabitethernet 2/0/0
[LSRA-GigabitEthernet2/0/0] mpls
[LSRA-GigabitEthernet2/0/0] mpls ldp
[LSRA-GigabitEthernet2/0/0] quit

    # Configure LSRB.

    [LSRB] mpls lsr-id 10.10.1.2
[LSRB] mpls
[LSRB-mpls] quit
[LSRB] mpls ldp
[LSRB-mpls-ldp] quit
[LSRB] interface gigabitethernet 1/0/0
[LSRB-GigabitEthernet1/0/0] mpls
[LSRB-GigabitEthernet1/0/0] mpls ldp
[LSRB-GigabitEthernet1/0/0] quit
[LSRB] interface gigabitethernet 2/0/0
[LSRB-GigabitEthernet2/0/0] mpls
[LSRB-GigabitEthernet2/0/0] mpls ldp
[LSRB-GigabitEthernet2/0/0] quit

    # Configure LSRC.

    [LSRC] mpls lsr-id 10.10.1.3
[LSRC] mpls
[LSRC-mpls] quit
[LSRC] mpls ldp
[LSRC-mpls-ldp] quit
[LSRC] interface gigabitethernet 1/0/0
[LSRC-GigabitEthernet1/0/0] mpls
[LSRC-GigabitEthernet1/0/0] mpls ldp
[LSRC-GigabitEthernet1/0/0] quit
[LSRC] interface gigabitethernet 2/0/0
[LSRC-GigabitEthernet2/0/0] mpls 
[LSRC-GigabitEthernet2/0/0] mpls ldp
[LSRC-GigabitEthernet2/0/0] quit
[LSRC] interface gigabitethernet 3/0/0
[LSRC-GigabitEthernet3/0/0] mpls
[LSRC-GigabitEthernet3/0/0] mpls ldp
[LSRC-GigabitEthernet3/0/0] quit

    # Configure LSRD.

    [LSRD] mpls lsr-id 10.10.1.4
[LSRD] mpls
[LSRD-mpls] quit
[LSRD] mpls ldp
[LSRD-mpls-ldp] quit
[LSRD] interface gigabitethernet 1/0/0
[LSRD-GigabitEthernet1/0/0] mpls
[LSRD-GigabitEthernet1/0/0] mpls ldp
[LSRD-GigabitEthernet1/0/0] quit

    # When the configurations are complete, run the display mpls lsp command on LSRA to view the established LSP.

    [LSRA] display mpls lsp
-------------------------------------------------------------------------------
                 LSP Information: LDP LSP
-------------------------------------------------------------------------------
FEC                In/Out Label  In/Out IF                      Vrf Name
10.10.1.2/32       NULL/3        -/GE1/0/0
10.10.1.2/32       1024/3        -/GE1/0/0
10.10.1.3/32       NULL/3        -/GE2/0/0
10.10.1.3/32       1025/3        -/GE2/0/0
10.10.1.4/32       NULL/1026     -/GE2/0/0
10.10.1.4/32       1026/1026     -/GE2/0/0
10.10.1.1/32       3/NULL        -/-

    The preceding command output shows that by default, the routes with 32-bit addresses trigger the setup of LSPs.

  4. Enable IS-IS auto FRR on LSRA. View the routing information and the setup of the backup LSP.

    # Enable IS-IS auto FRR on LSRA.

    [LSRA] isis
[LSRA-isis-1] frr
[LSRA-isis-1-frr] loop-free-alternate
[LSRA-isis-1-frr] quit
[LSRA-isis-1] quit

    # Display information about the direct routes between LSRA and LSRC, and between LSRA and LSRD.

    [LSRA] display ip routing-table 10.1.4.0 verbose
Route Flags: R - relay, D - download to fib, T -
to vpn-instance
------------------------------------------------------------------------------
Routing Table : Public
Summary Count : 1

Destination: 10.1.4.0/24
     Protocol: ISIS-L1         Process ID: 1
   Preference: 15                    Cost: 20
      NextHop: 10.1.2.2         Neighbour: 0.0.0.0
        State: Active Adv             Age: 00h05m38s
          Tag: 0                 Priority: low
        Label: NULL               QoSInfo: 0x0
   IndirectID: 0x0
 RelayNextHop: 0.0.0.0          Interface: GigabitEthernet2/0/0
     TunnelID: 0x0                  Flags: D
    BkNextHop: 10.1.1.2       BkInterface: GigabitEthernet1/0/0
      BkLabel: NULL           SecTunnelID: 0x0
 BkPETunnelID: 0x0        BkPESecTunnelID: 0x0
 BkIndirectID: 0x0

    The preceding command output shows that a backup IS-IS route is generated after IS-IS auto FRR is enabled.

    # Run the display mpls lsp command on LSRA to view the LSP setup result.

    [LSRA] display mpls lsp
-------------------------------------------------------------------------------
                 LSP Information: LDP LSP
-------------------------------------------------------------------------------
FEC                In/Out Label  In/Out IF                      Vrf Name
10.10.1.2/32       NULL/3        -/GE1/0/0
   **LDP FRR**         /1025      /GE2/0/0
10.10.1.2/32       1024/3        -/GE1/0/0
   **LDP FRR**         /1025      /GE2/0/0
10.10.1.3/32       NULL/3        -/GE2/0/0
   **LDP FRR**         /1025      /GE1/0/0
10.10.1.3/32       1025/3        -/GE2/0/0
   **LDP FRR**         /1025      /GE1/0/0
10.10.1.4/32       NULL/1026     -/GE2/0/0
   **LDP FRR**         /1026      /GE1/0/0
10.10.1.4/32       1026/1026     -/GE2/0/0
   **LDP FRR**         /1026      /GE1/0/0
10.10.1.1/32       3/NULL        -/-

    The preceding command output shows that by default, the routes with 32-bit addresses trigger the setup of a backup LSP.

  5. Run the lsp-trigger command on LSRC to change the LSP triggering policy so that all routes trigger the setup of LSPs. Then check the LSP setup result.

    # Run the lsp-trigger command on LSRC to change the LSP triggering policy so that all routes trigger the setup of LSPs.

    [LSRC] mpls
[LSRC-mpls] lsp-trigger all
[LSRC-mpls] quit

    # Run the display mpls lsp command on LSRA to view the established LSPs.

    [LSRA] display mpls lsp
-------------------------------------------------------------------------------
                 LSP Information: LDP LSP
-------------------------------------------------------------------------------
FEC                In/Out Label  In/Out IF                      Vrf Name
10.10.1.2/32       NULL/3        -/GE1/0/0
   **LDP FRR**         /1025      /GE2/0/0
10.10.1.2/32       1024/3        -/GE1/0/0
   **LDP FRR**         /1025      /GE2/0/0
10.10.1.3/32       NULL/3        -/GE2/0/0
   **LDP FRR**         /1025      /GE1/0/0
10.10.1.3/32       1025/3        -/GE2/0/0
   **LDP FRR**         /1025      /GE1/0/0
10.10.1.4/32       NULL/1026     -/GE2/0/0
   **LDP FRR**         /1026      /GE1/0/0
10.10.1.4/32       1026/1026     -/GE2/0/0
   **LDP FRR**         /1026      /GE1/0/0
10.10.1.1/32       3/NULL        -/- 
10.1.1.0/24      1027/3      -/GE2/0/0
10.1.2.0/24      1028/3      -/GE2/0/0

    The preceding command output shows that the routes with 24-bit addresses trigger the setup of LSPs.

  6. Configure a triggering policy to specify that all backup routes trigger the setup of backup LSPs.

    # Run the auto-frr lsp-trigger command on LSRA so that all backup routes trigger the setup of backup LSPs.

    [LSRA] mpls ldp
[LSRA-mpls-ldp] auto-frr lsp-trigger all
[LSRA-mpls-ldp] quit

  7. Verify the configuration.

    # Run the display mpls lsp command on LSRA to view the setup of backup LSPs.

    [LSRA] display mpls lsp
-------------------------------------------------------------------------------
                 LSP Information: LDP LSP
-------------------------------------------------------------------------------
FEC                In/Out Label  In/Out IF                      Vrf Name
10.10.1.2/32       NULL/3        -/GE1/0/0
   **LDP FRR**         /1025      /GE2/0/0
10.10.1.2/32       1024/3        -/GE1/0/0
   **LDP FRR**         /1025      /GE2/0/0
10.10.1.3/32       NULL/3        -/GE2/0/0
   **LDP FRR**         /1025      /GE1/0/0
10.10.1.3/32       1025/3        -/GE2/0/0
   **LDP FRR**         /1025      /GE1/0/0
10.10.1.4/32       NULL/1026     -/GE2/0/0
   **LDP FRR**         /1026      /GE1/0/0
10.10.1.4/32       1026/1026     -/GE2/0/0
   **LDP FRR**         /1026      /GE1/0/0
10.10.1.1/32       3/NULL        -/- 
10.1.1.0/24        1027/3        -/GE2/0/0
10.1.2.0/24        1028/3        -/GE2/0/0
   **LDP FRR**     /1027      /GE1/0/0

    # The preceding command output shows that the routes with 24-bit addresses trigger the setup of LSPs.

Configuration Files

  • LSRA configuration file

    #
 sysname LSRA
#
mpls lsr-id 10.10.1.1
mpls
#
mpls ldp
 auto-frr lsp-trigger all
#
isis 1
 frr
  loop-free-alternate level-1
  loop-free-alternate level-2
 network-entity 10.0000.0000.0001.00
#
interface GigabitEthernet1/0/0
 ip address 10.1.1.1 255.255.255.0
 isis enable 1
 mpls
 mpls ldp
#
interface GigabitEthernet2/0/0
 ip address 10.1.2.1 255.255.255.0
 isis enable 1
 mpls
 mpls ldp
#
interface LoopBack0
 ip address 10.10.1.1 255.255.255.255
 isis enable 1
#
return

  • LSRB configuration file

    #
 sysname LSRB
#
mpls lsr-id 10.10.1.2
mpls
#
mpls ldp
#
isis 1
 network-entity 10.0000.0000.0002.00
#
interface GigabitEthernet1/0/0
 ip address 10.1.1.2 255.255.255.0
 isis enable 1
 mpls
 mpls ldp
#
interface GigabitEthernet2/0/0
 ip address 10.1.3.1 255.255.255.0
 isis enable 1
 mpls
 mpls ldp
#
interface LoopBack0
 ip address 10.10.1.2 255.255.255.255
 isis enable 1
#
return

  • LSRC configuration file

    #
 sysname LSRC
#
mpls lsr-id 10.10.1.3
mpls
 lsp-trigger all
#
mpls ldp
#
isis 1
 network-entity 10.0000.0000.0003.00
#
interface GigabitEthernet1/0/0
 ip address 10.1.2.2 255.255.255.0
 isis enable 1
 mpls
 mpls ldp
#
interface GigabitEthernet2/0/0
 ip address 10.1.3.2 255.255.255.0
 isis enable 1
 mpls
 mpls ldp
#
interface GigabitEthernet3/0/0
 ip address 10.1.4.1 255.255.255.0
 isis enable 1
 mpls
 mpls ldp
#
interface LoopBack0
 ip address 10.10.1.3 255.255.255.255
 isis enable 1
#
return

  • LSRD configuration file

    #
 sysname LSRD
#
mpls lsr-id 10.10.1.4
mpls
#
mpls ldp
#
isis 1
 network-entity 10.0000.0000.0004.00
#
interface GigabitEthernet1/0/0
 ip address 10.1.4.2 255.255.255.0
 isis enable 1
 mpls
 mpls ldp
#
interface LoopBack0
 ip address 10.10.1.4 255.255.255.255
 isis enable 1
#
return
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Updated: 2022-12-12

Document ID: EDOC1100069335

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