IS-IS与静态BFD联动示例

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组网需求

  1. 网络中有三台路由器通过IS-IS协议实现互联互通
  2. Router A与Router B之间通过二层交换实现互联
  3. 要求当Router A与Router B之间路由器故障能够对故障结果做出反应，重新建立邻居

网络拓扑

IS-IS与静态BFD联动网络拓扑

配置思路

  1. 配置路由器基本功能以及IP地址
  2. 配置IS-IS协议以及接口使能IS-IS协议
  3. 配置静态BFD
  4. 配置IS-IS协议与BFD联动

配置命令

  1. 配置路由器基本功能以及IP地址

    • Router A配置

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      sys
      sys Router A
      int g0/0/0
        ip add 100.1.1.1 30

  • Router B配置

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    sys
    sys Router B
    int g0/0/0
      ip add 100.1.1.2 30
    int g0/0/1
      ip add 100.2.1.1 30

  • Router C配置

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    sys
    sys Router C
    int g0/0/1
      ip add 100.2.1.2 30

  1. 配置IS-IS协议以及接口使能IS-IS协议

    • Router A配置

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      sys
      isis 1
        is-level level-2
        network-entity 86.0010.1000.0100.1001.00
      int g0/0/0
        isis enable 1
        isis small-hello

  • Router B配置

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    isis 1
      is-level level-2
      network-entity 86.0010.1000.0100.1002.00
    int g0/0/0
      isis enable 1
      isis small-hello
    int g0/0/1
      isis enable 1
      isis small-hello

  • Router C配置

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    sys
    isis 1
      is-level level-2
      network-entity 86.0010.1000.0200.1002.00
    int g0/0/1
      isis enable 1
      isis small-hello

  1. 配置静态BFD

    • Router A配置

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      sys
      bfd
      q
      bfd A-to-B bind peer-ip 100.1.1.2 int g0/0/0
        discriminator local 1
        discriminator remote 2
        commit
        q

  • Router B配置

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    sys
    bfd
    q
    bfd B-to-A bind peer-ip 100.1.1.1 int g0/0/0
      discriminator local 2
      discriminator remote 1
      commit
      q

  1. 配置IS-IS接口使能BFD

    • Router A配置

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      sys
      int g0/0/0
        isis bfd static

  • Router B配置

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    sys
    int g0/0/0
      isis bfd static

测试结果

  1. 查看命令

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    # 查看IS-IS邻居
    dis isis peer
    <Router A>dis isis peer

                              Peer information for ISIS(1)

      System Id     Interface          Circuit Id       State HoldTime Type     PRI
    -------------------------------------------------------------------------------
    1000.0100.1002  GE0/0/0            1000.0100.1001.01 Up   20s      L2       64 

    Total Peer(s): 1


    # 查看IS-IS路由
    dis isis route
    <Router A>dis isis route 

                             Route information for ISIS(1)
                             -----------------------------

                            ISIS(1) Level-2 Forwarding Table
                            --------------------------------

    IPV4 Destination     IntCost    ExtCost ExitInterface   NextHop         Flags
    -------------------------------------------------------------------------------
    100.1.1.0/30         10         NULL    GE0/0/0         Direct          D/-/L/-
    100.2.1.0/30         20         NULL    GE0/0/0         100.1.1.2       A/-/-/-
         Flags: D-Direct, A-Added to URT, L-Advertised in LSPs, S-IGP Shortcut,
                                   U-Up/Down Bit Set

    #查看BFD会话状态
    dis bfd session all
    <Router A>dis bfd session all
    --------------------------------------------------------------------------------
    Local Remote     PeerIpAddr      State     Type        InterfaceName            
    --------------------------------------------------------------------------------

    1     2          100.1.1.2       Up        S_IP_IF     GigabitEthernet0/0/0     
    --------------------------------------------------------------------------------
         Total UP/DOWN Session Number : 1/0

  1. 打开终端日志信息功能

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    terminal logging

    terminal monitor

  1. 测试

    • Router B端口down掉

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      sys
      int g0/0/0
        shutdown

  • Router A日志信息和BFD状态以及IS-IS邻居状态

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    # 日志信息
    <Router A>
    Mar  2 2022 11:25:10-08:00 Router A %%01BFD/4/STACHG_TODWN(l)[0]:BFD session cha
    nged to Down. (SlotNumber=0, Discriminator=16777216, Diagnostic=DetectDown, Appl
    ications=None, ProcessPST=False, BindInterfaceName=GigabitEthernet0/0/0, Interfa
    cePhysicalState=Up, InterfaceProtocolState=Up) 
    <Router A>
    Mar  2 2022 11:25:10-08:00 Router A %%01ISIS/4/PEER_DOWN_BFDDOWN(l)[1]:ISIS 256 
    neighbor 1000.0100.1002 was Down on interface GE0/0/0 because the BFD node was d
    own. The Hello packet was received at 11:18:26 last time; the maximum interval f
    or sending Hello packets was 270991360; the local router sent 4127719424 Hello p
    ackets and received 83886080 packets; the type of the Hello packet was Lan Level
    -2. 
    <Router A>
    Mar  2 2022 11:25:10-08:00 Router A %%01ISIS/4/ADJ_CHANGE_LEVEL(l)[2]:The neighb
    or of ISIS was changed. (IsisProcessId=256, Neighbor=1000.0100.1002, InterfaceNa
    me=GE0/0/0, CurrentState=up, ChangeType=L2_BFD_DOWN, Level=Level-2) 
    <Router A>
    Mar  2 2022 11:25:10-08:00 Router A %%01ISIS/4/ADJ_CHANGE_LEVEL(l)[3]:The neighb
    or of ISIS was changed. (IsisProcessId=256, Neighbor=1000.0100.1002, InterfaceNa
    me=GE0/0/0, CurrentState=down, ChangeType=L2_HOLDTIMER_EXPIRED, Level=Level-2)

    # BFD会话状态
    <Router A>dis bfd session all
    --------------------------------------------------------------------------------
    Local Remote     PeerIpAddr      State     Type        InterfaceName            
    --------------------------------------------------------------------------------

    1     2          100.1.1.2       Down      S_IP_IF     GigabitEthernet0/0/0     
    --------------------------------------------------------------------------------
         Total UP/DOWN Session Number : 0/1

    # IS-IS邻居
    dis isis peer

    #dis isis route
    <Router A>dis isis route

                             Route information for ISIS(1)
                             -----------------------------

                            ISIS(1) Level-2 Forwarding Table
                            --------------------------------

    IPV4 Destination     IntCost    ExtCost ExitInterface   NextHop         Flags
    -------------------------------------------------------------------------------
    100.1.1.0/30         10         NULL    GE0/0/0         Direct          D/-/L/-
         Flags: D-Direct, A-Added to URT, L-Advertised in LSPs, S-IGP Shortcut,
                                   U-Up/Down Bit Set
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