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AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R009 CLI-based Configuration Guide - IP Unicast Routing
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Example for Configuring One-Arm Static BFD for RIP

Example for Configuring One-Arm Static BFD for RIP

Networking Requirements

As shown in Figure 3-11, there are four routers that communicate using RIP on a small-sized network. Services are transmitted through the primary link Router A->Router B->Router D. Reliability must be improved for data transmitted from Router A to Router B so that services can be rapidly switched to another path for transmission when the primary link fails.

Figure 3-11 Networking diagram for One-Arm static BFD for RIP

Configuration Roadmap

The configuration roadmap is as follows:

  1. Configure IP address for each interface to ensure network reachability.

  2. Enable RIP on each switch to implement network connections between processes.

  3. Configure One-Arm static BFD on Router A. BFD can rapidly detect the link status and help RIP speed up route convergence to implement fast link switching.

Procedure

  1. Configure IP address for each interface.

    # Configure Router A.

    <Huawei> system-view
[Huawei] sysname RouterA
[RouterA] interface gigabitethernet 1/0/0
[RouterA-GigabitEthernet1/0/0] ip address 192.168.2.1 24
[RouterA-GigabitEthernet1/0/0] quit
[RouterA] interface gigabitethernet 2/0/0
[RouterA-GigabitEthernet2/0/0] ip address 192.168.3.1 24
[RouterA-GigabitEthernet2/0/0] quit

    The configurations of Router B, Router C and Router D are similar to the configuration of Router A, and are not mentioned here.

  2. Configure basic RIP functions.

    # Configure Router A.

    [RouterA] rip 1
[RouterA-rip-1] version 2
[RouterA-rip-1] network 192.168.2.0
[RouterA-rip-1] network 192.168.3.0
[RouterA-rip-1] quit

    # Configure Router B. 

    [RouterB] rip 1
[RouterB-rip-1] version 2
[RouterB-rip-1] network 192.168.2.0
[RouterB-rip-1] network 192.168.4.0
[RouterB-rip-1] network 172.16.0.0
[RouterB-rip-1] quit

    # Configure Router C. 

    [RouterC] rip 1
[RouterC-rip-1] version 2
[RouterC-rip-1] network 192.168.3.0
[RouterC-rip-1] network 192.168.4.0
[RouterC-rip-1] quit

    # Configure Router D. 

    [RouterD] rip 1
[RouterD-rip-1] version 2
[RouterD-rip-1] network 172.16.0.0
[RouterD-rip-1] quit

    # After the configurations are complete, run the display rip neighbor command, and you can see that RIP neighbor relationships among Router A, Router B, and Router C have been established. Take the display on Router A as an example. 

    [RouterA] display rip 1 neighbor
    ---------------------------------------------------------------------

 IP Address      Interface                   Type   Last-Heard-Time
---------------------------------------------------------------------
 192.168.2.2         GigabitEthernet1/0/0        RIP    0:0:1
 Number of RIP routes  : 1
 192.168.3.3         GigabitEthernet2/0/0        RIP    0:0:2
 Number of RIP routes  : 2

    # Run the display ip routing-table command, and you can see that routers have learned routes from each other. Take the display on Router A as an example. 

    [RouterA] display ip routing-table
    Route Flags:
R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
         Destinations : 8        Routes : 9

Destination/Mask    Proto   Pre  Cost      Flags NextHop         Interface

        192.168.2.0/24  Direct  0    0           D   192.168.2.1         GigabitEthernet1/0/0
        192.168.2.1/32  Direct  0    0           D   127.0.0.1       GigabitEthernet1/0/0
        192.168.3.0/24  Direct  0    0           D   192.168.3.1         GigabitEthernet2/0/0
        192.168.3.1/32  Direct  0    0           D   127.0.0.1       GigabitEthernet2/0/0
        192.168.4.0/8   RIP     100  1           D   192.168.2.2         GigabitEthernet1/0/0
                    RIP     100  1           D   192.168.3.3         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
     172.16.0.0/16  RIP     100  1           D   192.168.2.2         GigabitEthernet1/0/0

    The routing table shows that the next-hop IP address of the route destined for 172.16.0.0/16 is 192.168.2.2, the outbound interface is GigabitEthernet 1/0/0, and traffic is transmitted along the primary link Router A ->Router B.

  3. Configure one-arm static BFD on Router A.

    # Configure one-arm BFD on Router A. 

    [RouterA] bfd
[RouterA-bfd] quit
[RouterA] bfd 1 bind peer-ip 192.168.2.2 interface gigabitethernet 1/0/0 one-arm-echo
[RouterA-session-1] discriminator local 1
[RouterA-session-1] min-echo-rx-interval 200
[RouterA-session-1] commit
[RouterA-session-1] quit

    # Enable static BFD on GigabitEthernet 1/0/0. 

    [RouterA] interface gigabitethernet 1/0/0
[RouterA-GigabitEthernet1/0/0] rip bfd static
[RouterA-GigabitEthernet1/0/0] quit

    # After the configurations are completed, run the display bfd session all command on Router A and you can see that a static BFD session is set up. 

    [RouterA] display bfd session all
    [RouterA] display bfd session all
-------------------------------------------------------------------------------------------
Local  Remote  PeerIpAddr      State     Type        InterfaceName                
-------------------------------------------------------------------------------------------
1      -       192.168.2.2         Up        S_IP_IF     GigabitEthernet1/0/0                
-------------------------------------------------------------------------------------------
     Total UP/DOWN Session Number : 1/0

  4. Verify the configuration.

    # Run the shutdown command on GE 1/0/0 on Router B to simulate a fault on the primary link.

    Fault simulation is for configuration verification. In actual application, it is not required. 

    [RouterB] interface gigabitethernet 1/0/0
[RouterB-GigabitEthernet1/0/0] shutdown

    # Check the routing table of Router A. 

    [RouterA] display ip routing-table
    Route Flags:
R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
         Destinations : 6        Routes : 6

Destination/Mask    Proto   Pre  Cost      Flags NextHop         Interface

        192.168.3.0/24  Direct  0    0           D   192.168.3.1         GigabitEthernet2/0/0
        192.168.3.1/32  Direct  0    0           D   127.0.0.1       GigabitEthernet2/0/0
        192.168.4.0/8   RIP     100  1           D   192.168.3.3         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
     172.16.0.0/16  RIP     100  2           D   192.168.3.3         GigabitEthernet2/0/0

    The routing table shows that the secondary link Router A -> Router C -> Router B starts to be used after the primary link fails. The next-hop IP address of the route destined for 172.16.0.0/16 is 192.168.3.3 and the outbound interface is GE 2/0/0.

Configuration Files

  • Configuration file of Router A 

    #
 sysname RouterA
#
bfd
#
interface GigabitEthernet1/0/0 
 ip address 192.168.2.1 255.255.255.0
 rip bfd static
#
interface GigabitEthernet2/0/0
 ip address 192.168.3.1 255.255.255.0
#
rip 1 
 version 2 
 network 192.168.2.0
 network 192.168.3.0
#
bfd 1 bind peer-ip 192.168.2.2 interface GigabitEthernet1/0/0 one-arm-echo
 discriminator local 1  
 min-echo-rx-interval 200
commit
#
return

  • Configuration file of Router B 

    #
 sysname RouterB
#
bfd
#
interface GigabitEthernet1/0/0 
 ip address 192.168.2.2 255.255.255.0
#
interface GigabitEthernet2/0/0
 ip address 192.168.4.1 255.255.255.0
#
interface GigabitEthernet3/0/0
 ip address 172.16.1.1 255.255.255.0
#
rip 1 
 version 2 
 network 192.168.2.0
 network 192.168.4.0
 network 172.16.0.0
#
return

  • Configuration file of Router C

    #
 sysname RouterC
#
interface GigabitEthernet1/0/0 
 ip address 192.168.4.2 255.255.255.0
#
interface GigabitEthernet2/0/0
 ip address 192.168.3.3 255.255.255.0
#
rip 1 
 version 2 
 network 192.168.3.0
 network 192.168.4.0
#
return

  • Configuration file of Router D 

    #
 sysname RouterD
#
interface GigabitEthernet1/0/0 
 ip address 172.16.1.2 255.255.255.0
#
rip 1 
 version 2 
 network 172.16.0.0
#
return
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Updated: 2022-05-16

Document ID: EDOC1000174069

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