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Configuration Guide - IP Unicast Routing

CloudEngine 8800, 7800, 6800, and 5800 V200R005C10

This document describes the configurations of IP Unicast Routing, including IP Routing, Static Route, RIP, RIPng, OSPF, OSPFv3, IPv4 IS-IS, IPv6 IS-IS, BGP, Routing Policy, and PBR.
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Example for Configuring Static BFD for IPv6 Static Routes

Example for Configuring Static BFD for IPv6 Static Routes

Networking Requirements

As shown in Figure 2-12, SwitchA and SwitchB connect to each other and have static routes configured between them. Customers require that a link fault between SwitchA and SwitchB be detected within milliseconds and SwitchA and SwitchB dynamically update their routing tables.

Figure 2-12 Networking diagram for configuring static BFD for IPv6 static routes

Configuration Roadmap

To meet the preceding requirement, configure static BFD for IPv6 static routes. The configuration roadmap is as follows:

  1. Configure a BFD session between SwitchA and SwitchB to implement millisecond-level fault detection.

  2. Configure a static route from SwitchA to SwitchB and bind the static route to the BFD session so that SwitchA and SwitchB can update their routing tables after a fault is detected.

Procedure

  1. Configure IPv6 addresses for interfaces. The configuration details are not provided here.
  2. Configure a BFD session between SwitchA and SwitchB.

    # On SwitchA, create a BFD session with SwitchB.

    <SwitchA> system-view
    [~SwitchA] bfd
    [*SwitchA-bfd] quit
    [*SwitchA] bfd aa bind peer-ipv6 fc00:0:0:2001::2
    [*SwitchA-bfd-session-aa] discriminator local 10
    [*SwitchA-bfd-session-aa] discriminator remote 20
    [*SwitchA-bfd-session-aa] commit
    [~SwitchA-bfd-session-aa] quit

    # On SwitchB, create a BFD session with SwitchA.

    <SwitchB> system-view
    [~SwitchB] bfd
    [*SwitchB-bfd] quit
    [*SwitchB] bfd bb bind peer-ipv6 fc00:0:0:2001::1
    [*SwitchB-bfd-session-bb] discriminator local 20
    [*SwitchB-bfd-session-bb] discriminator remote 10
    [*SwitchB-bfd-session-bb] commit
    [~SwitchB-bfd-session-bb] quit

  3. Configure a default static route and bind the route to the BFD session.

    # On SwitchA, configure a default static route to SwitchB and bind the route to the BFD session named aa.

    [~SwitchA] ipv6 route-static 0::0 0 fc00:0:0:2001::2 track bfd-session aa
    [*SwitchA] commit
    [~SwitchA] quit

  4. Verify the configuration.

    # After the configurations are complete, run the display bfd session all command on SwitchA or SwitchB. You can view that the BFD session has been established and in Up state. Run the display current-configuration | include bfd command in the system view. You can view that the default static route has already been bound to the BFD session.

    Take the display on SwitchA as an example:

    <SwitchA> display bfd session all
    S: Static session                                                                                                                   
    D: Dynamic session                                                                                                                  
    IP: IP session                                                                                                                      
    IF: Single-hop session                                                                                                              
    PEER: Multi-hop session                                                                                                             
    LDP: LDP session                                                                                                                    
    LSP: Label switched path                                                                                                            
    TE: Traffic Engineering                                                                                                             
    AUTO: Automatically negotiated session                                                                                              
    VXLAN: VXLAN session                                                                                                                
    VSI: VSI PW session                                                                                                                 
    (w): State in WTR                                                                                                                   
    (*): State is invalid                                                                                                               
    Total UP/DOWN Session Number : 1/0                                                                                                  
    --------------------------------------------------------------------------------                                                    
    Local      Remote     PeerIpAddr      State     Type        InterfaceName                                                           
    --------------------------------------------------------------------------------                                                    
    10         20         FC00:0:0:2004::2                                                                                              
                                          Up        S/IP-PEER          -                                                                
    --------------------------------------------------------------------------------        
    <SwitchA> display current-configuration | include bfd
     bfd
    bfd aa bind peer-ipv6 FC00:0:0:2001::2
     ipv6 route-static :: 0 FC00:0:0:2001::2 track bfd-session aa

    # Check the IPv6 routing table on SwitchA. You can view that the default static route exists in the routing table.

    <SwitchA> display ipv6 routing-table
    Route Flags: R - relay, D - download to fib, B - black hole route                                              
    ----------------------------------------------------------------------------
     Routing Table : _public_
             Destinations : 5        Routes : 5
    
     Destination  : ::                              PrefixLength : 0
     NextHop      : FC00:0:0:2001::2                Preference   : 60
     Cost         : 0                               Protocol     : Static
     RelayNextHop : ::                              TunnelID     : 0x0
     Interface    : 10GE1/0/1                       Flags        : RD
    
     Destination  : ::1                             PrefixLength : 128
     NextHop      : ::1                             Preference   : 0
     Cost         : 0                               Protocol     : Direct
     RelayNextHop : ::                              TunnelID     : 0x0
     Interface    : InLoopBack0                     Flags        : D
    
     Destination  : FC00:0:0:2001::                 PrefixLength : 64
     NextHop      : FC00:0:0:2001::1                Preference   : 0
     Cost         : 0                               Protocol     : Direct
     RelayNextHop : ::                              TunnelID     : 0x0
     Interface    : 10GE1/0/1                       Flags        : D
    
     Destination  : FC00:0:0:2001::1                PrefixLength : 128
     NextHop      : ::1                             Preference   : 0
     Cost         : 0                               Protocol     : Direct
     RelayNextHop : ::                              TunnelID     : 0x0
     Interface    : 10GE1/0/1                       Flags        : D
    
     Destination  : FE80::                          PrefixLength : 10
     NextHop      : ::                              Preference   : 0
     Cost         : 0                               Protocol     : Direct
     RelayNextHop : ::                              TunnelID     : 0x0
     Interface    : NULL0                           Flags        : D

    # Run the shutdown command on 10GE1/0/1 of SwitchB to simulate a link fault.

    [~SwitchB] interface 10ge1/0/1
    [~SwitchB-10GE1/0/1] shutdown
    [*SwitchB-10GE1/0/1] commit

    # Check the routing table on SwitchA. You can view that the default static route 0::0/0 does not exist. This is because the default static route is bound to the BFD session. After BFD detects a link fault, BFD rapidly notifies SwitchA that the static route is unavailable.

    <SwitchA> display ipv6 routing-table
    Route Flags: R - relay, D - download to fib, B - black hole route                                              
    ----------------------------------------------------------------------------
     Routing Table : _public_
             Destinations : 1        Routes : 1
    
     Destination  : ::1                             PrefixLength : 128
     NextHop      : ::1                             Preference   : 0
     Cost         : 0                               Protocol     : Direct
     RelayNextHop : ::                              TunnelID     : 0x0
     Interface    : InLoopBack0                     Flags        : D

Configuration Files

  • Configuration file of SwitchA

    #
    sysname SwitchA
    #
    bfd
    #
    interface 10GE1/0/1
     undo portswitch
     ipv6 enable
     ipv6 address FC00:0:0:2001::1/64
    #
    bfd aa bind peer-ipv6 FC00:0:0:2001::2
     discriminator local 10
     discriminator remote 20
    #
    ipv6 route-static :: 0 FC00:0:0:2001::2 track bfd-session aa
    #
    return
  • Configuration file of SwitchB

    #
    sysname SwitchB
    #
    bfd
    #
    interface 10GE1/0/1
     undo portswitch
     ipv6 enable
     ipv6 address FC00:0:0:2001::2/64
    #
    interface 10GE1/0/2
     undo portswitch
     ipv6 enable
     ipv6 address FC00:0:0:2002::1/64
    #
    bfd bb bind peer-ipv6 FC00:0:0:2001::1
     discriminator local 20
     discriminator remote 10
    #
    return
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Updated: 2019-04-20

Document ID: EDOC1100074760

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