Example for Configuring SBFD to Monitor SR-MPLS BE Tunnels

This section provides an example for configuring SBFD to monitor SR-MPLS BE tunnels, which improves network reliability.

Networking Requirements

As shown in Figure 1, SR-MPLS BE tunnels are established between PEs on the public network. To improve network reliability, configure SBFD. SBFD can be used to monitor the SR-MPLS BE tunnels. If the primary tunnel fails, applications such as VPN FRR are instructed to quickly switch traffic, minimizing the impact on services.

Figure 1 SBFD for SR-MPLS BE tunnel

Interfaces 1 and 2 in this example represent GE 0/1/0 and GE 0/1/8, respectively.


Configuration Roadmap

The configuration roadmap is as follows:

  1. Enable IS-IS on the backbone network to ensure that PEs interwork with each other.

  2. Configure MPLS and Segment Routing on the backbone network to establish SR LSPs. Enable topology independent-loop free alternate (TI-LFA) FRR.

  3. Configure SBFD to establish sessions between PEs to monitor SR-MPLS BE tunnels.

Data Preparation

To complete the configuration, you need the following data:

  • MPLS LSR IDs of the PEs and P

  • SRGB ranges on the PEs and P

Procedure

  1. Assign an IP address to each interface.

    # Configure PE1.

    <HUAWEI> system-view
[~HUAWEI] sysname PE1
[*HUAWEI] commit
[~PE1] interface loopback 1
[*PE1-LoopBack1] ip address 1.1.1.9 32
[*PE1-LoopBack1] quit
[*PE1] interface gigabitethernet0/1/0
[*PE1-GigabitEthernet0/1/0] ip address 172.18.1.1 24
[*PE1-GigabitEthernet0/1/0] quit
[*PE1] interface gigabitethernet0/1/8
[*PE1-GigabitEthernet0/1/8] ip address 172.16.1.1 24
[*PE1-GigabitEthernet0/1/8] quit
[*PE1] commit

    # Configure P1.

    <HUAWEI> system-view
[~HUAWEI] sysname P1
[*HUAWEI] commit
[~P1] interface loopback 1
[*P1-LoopBack1] ip address 2.2.2.9 32
[*P1-LoopBack1] quit
[*P1] interface gigabitethernet0/1/0
[*P1-GigabitEthernet0/1/0] ip address 172.16.1.2 24
[*P1-GigabitEthernet0/1/0] quit
[*P1] interface gigabitethernet0/1/8
[*P1-GigabitEthernet0/1/8] ip address 172.17.1.1 24
[*P1-GigabitEthernet0/1/8] quit
[*P1] commit

    # Configure PE2.

    <HUAWEI> system-view
[~HUAWEI] sysname PE2
[*HUAWEI] commit
[~PE2] interface loopback 1
[*PE2-LoopBack1] ip address 3.3.3.9 32
[*PE2-LoopBack1] quit
[*PE2] interface gigabitethernet0/1/0
[*PE2-GigabitEthernet0/1/0] ip address 172.19.1.2 24
[*PE2-GigabitEthernet0/1/0] quit
[*PE2] interface gigabitethernet0/1/8
[*PE2-GigabitEthernet0/1/8] ip address 172.17.1.2 24
[*PE2-GigabitEthernet0/1/8] quit
[*PE2] commit

    # Configure P2.

    <HUAWEI> system-view
[~HUAWEI] sysname P2
[*HUAWEI] commit
[~P2] interface loopback 1
[*P2-LoopBack1] ip address 4.4.4.9 32
[*P2-LoopBack1] quit
[*P2] interface gigabitethernet0/1/0
[*P2-GigabitEthernet0/1/0] ip address 172.18.1.2 24
[*P2-GigabitEthernet0/1/0] quit
[*P2] interface gigabitethernet0/1/8
[*P2-GigabitEthernet0/1/8] ip address 172.19.1.1 24
[*P2-GigabitEthernet0/1/8] quit
[*P2] commit

  2. Configure an IGP on the backbone network to enable the PEs to communicate. IS-IS is used as an example.

    # Configure PE1.

    [~PE1] isis 1
[*PE1-isis-1] is-level level-1
[*PE1-isis-1] network-entity 10.0000.0000.0001.00
[*PE1-isis-1] quit
[*PE1] interface loopback 1
[*PE1-LoopBack1] isis enable 1
[*PE1-LoopBack1] quit
[*PE1] interface gigabitethernet0/1/0
[*PE1-GigabitEthernet0/1/0] isis enable 1
[*PE1-GigabitEthernet0/1/0] quit
[*PE1] interface gigabitethernet0/1/8
[*PE1-GigabitEthernet0/1/8] isis enable 1
[*PE1-GigabitEthernet0/1/8] quit
[*PE1] commit

    # Configure P1.

    [~P1] isis 1
[*P1-isis-1] is-level level-1
[*P1-isis-1] network-entity 10.0000.0000.0002.00
[*P1-isis-1] quit
[*P1] interface loopback 1
[*P1-LoopBack1] isis enable 1
[*P1-LoopBack1] quit
[*P1] interface gigabitethernet0/1/0
[*P1-GigabitEthernet0/1/0] isis enable 1
[*P1-GigabitEthernet0/1/0] quit
[*P1] interface gigabitethernet0/1/8
[*P1-GigabitEthernet0/1/8] isis enable 1
[*P1-GigabitEthernet0/1/8] quit
[*P1] commit

    # Configure PE2.

    [~PE2] isis 1
[*PE2-isis-1] is-level level-1
[*PE2-isis-1] network-entity 10.0000.0000.0003.00
[*PE2-isis-1] quit
[*PE2] interface loopback 1
[*PE2-LoopBack1] isis enable 1
[*PE2-LoopBack1] quit
[*PE2] interface gigabitethernet0/1/8
[*PE2-GigabitEthernet0/1/8] isis enable 1
[*PE2-GigabitEthernet0/1/8] quit
[*PE2] interface gigabitethernet0/1/0
[*PE2-GigabitEthernet0/1/0] isis enable 1
[*PE2-GigabitEthernet0/1/0] quit
[*PE2] commit

    # Configure P2.

    [~P2] isis 1
[*P2-isis-1] is-level level-1
[*P2-isis-1] network-entity 10.0000.0000.0004.00
[*P2-isis-1] quit
[*P2] interface loopback 1
[*P2-LoopBack1] isis enable 1
[*P2-LoopBack1] quit
[*P2] interface gigabitethernet0/1/0
[*P2-GigabitEthernet0/1/0] isis enable 1
[*P2-GigabitEthernet0/1/0] quit
[*P2] interface gigabitethernet0/1/8
[*P2-GigabitEthernet0/1/8] isis enable 1
[*P2-GigabitEthernet0/1/8] quit
[*P2] commit

  3. (Optional) Configure basic MPLS functions on the backbone network.

    MPLS is automatically enabled on the interface where IS-IS has been enabled. Therefore, you can skip this step.

    # Configure PE1.

    [~PE1] mpls lsr-id 1.1.1.9
[*PE1] mpls
[*PE1-mpls] commit
[~PE1-mpls] quit

    # Configure P1.

    [~P1] mpls lsr-id 2.2.2.9
[*P1] mpls
[*P1-mpls] commit
[~P1-mpls] quit

    # Configure PE2.

    [~PE2] mpls lsr-id 3.3.3.9
[*PE2] mpls
[*PE2-mpls] commit
[~PE2-mpls] quit

    # Configure P2.

    [~P2] mpls lsr-id 4.4.4.9
[*P2] mpls
[*P2-mpls] commit
[~P2-mpls] quit

  4. Configure SR on the backbone network and enable TI-LFA FRR.

    # Configure PE1.

    [~PE1] segment-routing
[*PE1-segment-routing] quit
[*PE1] isis 1
[*PE1-isis-1] cost-style wide
[*PE1-isis-1] segment-routing mpls
[*PE1-isis-1] segment-routing global-block 160000 161000

    The SRGB range various according to a live network. Set a range as needed. The SRGB setting here is an example.

    [*PE1-isis-1] frr
[*PE1-isis-1-frr] loop-free-alternate level-1
[*PE1-isis-1-frr] ti-lfa level-1
[*PE1-isis-1-frr] quit
[*PE1-isis-1] quit
[*PE1] interface loopback 1
[*PE1-LoopBack1] isis prefix-sid index 10
[*PE1-LoopBack1] quit
[*PE1] commit

    # Configure P1.

    [~P1] segment-routing
[*P1-segment-routing] quit
[*P1] isis 1
[*P1-isis-1] cost-style wide
[*P1-isis-1] segment-routing mpls
[*P1-isis-1] segment-routing global-block 160000 161000

    The SRGB range various according to a live network. Set a range as needed. The SRGB setting here is an example.

    [*P1-isis-1] frr
[*P1-isis-1-frr] loop-free-alternate level-1
[*P1-isis-1-frr] ti-lfa level-1
[*P1-isis-1-frr] quit
[*P1-isis-1] quit
[*P1] interface loopback 1
[*P1-LoopBack1] isis prefix-sid index 20
[*P1-LoopBack1] quit
[*P1] commit

    # Configure PE2.

    [~PE2] segment-routing
[*PE2-segment-routing] quit
[*PE2] isis 1
[*PE2-isis-1] cost-style wide
[*PE2-isis-1] segment-routing mpls
[*PE2-isis-1] segment-routing global-block 160000 161000

    The SRGB range various according to a live network. Set a range as needed. The SRGB setting here is an example.

    [*PE2-isis-1] frr
[*PE2-isis-1-frr] loop-free-alternate level-1
[*PE2-isis-1-frr] ti-lfa level-1
[*PE2-isis-1-frr] quit
[*PE2-isis-1] quit
[*PE2] interface loopback 1
[*PE2-LoopBack1] isis prefix-sid index 30
[*PE2-LoopBack1] quit
[*PE2] commit

    # Configure P2.

    [~P2] segment-routing
[*P2-segment-routing] quit
[*P2] isis 1
[*P2-isis-1] cost-style wide
[*P2-isis-1] segment-routing mpls
[*P2-isis-1] segment-routing global-block 160000 161000

    The SRGB range various according to a live network. Set a range as needed. The SRGB setting here is an example.

    [*P2-isis-1] frr
[*P2-isis-1-frr] loop-free-alternate level-1
[*P2-isis-1-frr] ti-lfa level-1
[*P2-isis-1-frr] quit
[*P2-isis-1] quit
[*P2] interface loopback 1
[*P2-LoopBack1] isis prefix-sid index 40
[*P2-LoopBack1] quit
[*P2] commit

    # After completing the configuration, run the display tunnel-info all command on a PE. The SR LSP has been established. In the following example, the command output on PE1 is used.

    [~PE1] display tunnel-info all
Tunnel ID            Type                Destination                             Status
----------------------------------------------------------------------------------------
0x000000002900000003 srbe-lsp            4.4.4.9                                 UP  
0x000000002900000004 srbe-lsp            2.2.2.9                                 UP  
0x000000002900000005 srbe-lsp            3.3.3.9                                 UP

    # Use ping to monitor SR LSP connectivity on PE1.

    [~PE1] ping lsp segment-routing ip 3.3.3.9 32 version draft2
  LSP PING FEC: SEGMENT ROUTING IPV4 PREFIX 3.3.3.9/32 : 100  data bytes, press CTRL_C to break
    Reply from 3.3.3.9: bytes=100 Sequence=1 time=12 ms
    Reply from 3.3.3.9: bytes=100 Sequence=2 time=5 ms
    Reply from 3.3.3.9: bytes=100 Sequence=3 time=5 ms
    Reply from 3.3.3.9: bytes=100 Sequence=4 time=5 ms
    Reply from 3.3.3.9: bytes=100 Sequence=5 time=5 ms

  --- FEC: SEGMENT ROUTING IPV4 PREFIX 3.3.3.9/32 ping statistics ---
    5 packet(s) transmitted
    5 packet(s) received
    0.00% packet loss
    round-trip min/avg/max = 5/6/12 ms

  5. Configure SBFD on PEs.

    # Configure PE1.

    [~PE1] bfd
[*PE1-bfd] quit
[*PE1] sbfd
[*PE1-sbfd] quit
[*PE1] segment-routing
[*PE1-segment-routing] seamless-bfd enable mode tunnel
[*PE1-segment-routing] commit
[~PE1-segment-routing] quit

    # Configure PE2.

    [~PE2] bfd
[*PE2-bfd] quit
[*PE2] sbfd
[*PE2-sbfd] reflector discriminator 3.3.3.9
[*PE2-sbfd] commit
[~PE2-sbfd] quit

  6. Verify the configuration.

    Run the display segment-routing seamless-bfd tunnel session prefix ip-address command on a PE. The command output shows information about SBFD sessions that monitor SR tunnels.

    In the following example, the command output on PE1 is used.

    [~PE1] display segment-routing seamless-bfd tunnel session prefix 3.3.3.9 32
Seamless BFD Information for SR Tunnel
Total Tunnel Number: 1
-------------------------------------------------------------------
Prefix               Discriminator                  State          
-------------------------------------------------------------------
3.3.3.9/32           16385                          Up             
-------------------------------------------------------------------

Configuration Files

  • PE1 configuration file

    #
sysname PE1
#
bfd
#
sbfd
#
mpls lsr-id 1.1.1.9
#               
mpls            
#               
segment-routing 
 seamless-bfd enable mode tunnel
#               
isis 1          
 is-level level-1
 cost-style wide
 network-entity 10.0000.0000.0001.00
 segment-routing mpls
 segment-routing global-block 160000 161000
 frr
  loop-free-alternate level-1
  ti-lfa level-1
#               
interface GigabitEthernet0/1/0
 undo shutdown  
 ip address 172.18.1.1 255.255.255.0
 isis enable 1  
#               
interface GigabitEthernet0/1/8
 undo shutdown  
 ip address 172.16.1.1 255.255.255.0
 isis enable 1  
#               
interface LoopBack1
 ip address 1.1.1.9 255.255.255.255
 isis enable 1  
 isis prefix-sid index 10
#
return

  • P1 configuration file

    #
sysname P1
#
mpls lsr-id 2.2.2.9
#               
mpls            
#               
segment-routing 
#               
isis 1          
 is-level level-1
 cost-style wide
 network-entity 10.0000.0000.0002.00
 segment-routing mpls
 segment-routing global-block 160000 161000
 frr
  loop-free-alternate level-1
  ti-lfa level-1
#               
interface GigabitEthernet0/1/0
 undo shutdown  
 ip address 172.16.1.2 255.255.255.0
 isis enable 1  
#               
interface GigabitEthernet0/1/8
 undo shutdown  
 ip address 172.17.1.1 255.255.255.0
 isis enable 1  
#               
interface LoopBack1
 ip address 2.2.2.9 255.255.255.255
 isis enable 1  
 isis prefix-sid index 20
#
return

  • PE2 configuration file

    #
sysname PE2
#
bfd
#
sbfd
 reflector discriminator 3.3.3.9
#
mpls lsr-id 3.3.3.9
#               
mpls            
#               
segment-routing 
#               
isis 1          
 is-level level-1
 cost-style wide
 network-entity 10.0000.0000.0003.00
 segment-routing mpls
 segment-routing global-block 160000 161000
 frr
  loop-free-alternate level-1
  ti-lfa level-1
#               
interface GigabitEthernet0/1/0
 undo shutdown  
 ip address 172.19.1.2 255.255.255.0
 isis enable 1  
#               
interface GigabitEthernet0/1/8
 undo shutdown  
 ip address 172.17.1.2 255.255.255.0
 isis enable 1  
#               
interface LoopBack1
 ip address 3.3.3.9 255.255.255.255
 isis enable 1  
 isis prefix-sid index 30
#
return

  • P2 configuration file

    #
sysname P2
#
mpls lsr-id 4.4.4.9
#               
mpls            
#               
segment-routing 
#               
isis 1          
 is-level level-1
 cost-style wide
 network-entity 10.0000.0000.0004.00
 segment-routing mpls
 segment-routing global-block 160000 161000
 frr
  loop-free-alternate level-1
  ti-lfa level-1
#               
interface GigabitEthernet0/1/0
 undo shutdown  
 ip address 172.18.1.2 255.255.255.0
 isis enable 1  
#               
interface GigabitEthernet0/1/8
 undo shutdown  
 ip address 172.19.1.1 255.255.255.0
 isis enable 1  
#               
interface LoopBack1
 ip address 4.4.4.9 255.255.255.255
 isis enable 1  
 isis prefix-sid index 40
#
return
Parent Topic: Configuring Examples for SR-MPLS BE
Copyright © Huawei Technologies Co., Ltd.
Copyright © Huawei Technologies Co., Ltd.
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