H3C IS-IS配置6-与BFD联动配置举例

1.组网需求  

·     Switch A、Switch B和Switch C上运行IS-IS，网络层相互可达。

·     当Switch A和Switch B通过L2 Switch通信的链路出现故障时BFD能够快速感知通告IS-IS协议，并且切换到Switch C进行通信。

     

 2.配置步骤

  1）配置各交换机接口的IP地址和IS-IS协议

  配置各交换机之间采用IS-IS协议进行互连，确保Switch A、Switch B和Switch C之间能够在网络层互通，并且各交换机之间能够借助IS-IS协议实现动态路由更新。

  2）配置BFD功能

# 在Switch A上使能BFD检测功能，并配置BFD参数。
[SwitchA] bfd session init-mode passive
[SwitchA] interface vlan-interface 10
[SwitchA-Vlan-interface10] isis bfd enable
[SwitchA-Vlan-interface10] bfd min-receive-interval 500
[SwitchA-Vlan-interface10] bfd min-transmit-interval 500
[SwitchA-Vlan-interface10] bfd detect-multiplier 7

# 在Switch B上使能BFD检测功能，并配置BFD参数。
[SwitchB] bfd session init-mode active
[SwitchB] interface vlan-interface 10
[SwitchB-Vlan-interface10] isis bfd enable
[SwitchB-Vlan-interface10] bfd min-receive-interval 500
[SwitchB-Vlan-interface10] bfd min-transmit-interval 500
[SwitchB-Vlan-interface10] bfd detect-multiplier 8

3.配置验证  

# 显示Switch A的BFD信息。
<SwitchA> display bfd session
 Total Session Num: 1     Up Session Num: 1     Init Mode: Active
 IPv4 session working in control packet mode:
 LD/RD          SourceAddr      DestAddr        State    Holdtime    Interface
 3/1            192.168.0.102   192.168.0.100   Up       1700ms      Vlan10

# 在Switch A上查看120.1.1.1/32的路由信息，可以看出Switch A和Switch B是通过L2 Switch进行通信的。
<SwitchA> display ip routing-table 120.1.1.1 verbose
Summary count : 1
Destination: 120.1.1.1/32
   Protocol: IS_L1
 Process ID: 1
  SubProtID: 0x1                    Age: 04h20m37s
       Cost: 10              Preference: 10
      IpPre: N/A             QosLocalID: N/A
        Tag: 0                    State: Active Adv
  OrigTblID: 0x0                OrigVrf: default-vrf
    TableID: 0x2                 OrigAs: 0
      NibID: 0x26000002          LastAs: 0
     AttrID: 0xffffffff        Neighbor: 0.0.0.0
      Flags: 0x1008c        OrigNextHop: 192.168.0.100
      Label: NULL           RealNextHop: 192.168.0.100
    BkLabel: NULL             BkNextHop: N/A
    SRLabel: NULL             BkSRLabel: NULL
   SIDIndex: NULL               InLabel: NULL
  Tunnel ID: Invalid          Interface: Vlan-interface10
BkTunnel ID: Invalid        BkInterface: N/A
   FtnIndex: 0x0           TrafficIndex: N/A
  Connector: N/A                 PathID: 0x0
   LinkCost: 0               MicroSegID: 0

  当Switch A和Switch B通过L2 Switch通信的链路出现故障时：  

# 在Switch A上查看120.1.1.1/32的路由信息，可以看出Switch A和Switch B已经切换到Switch C进行通信。

<SwitchA> display ip routing-table 120.1.1.1 verbose
Summary count : 1
Destination: 120.1.1.1/32
   Protocol: IS_L1
 Process ID: 1
  SubProtID: 0x1                    Age: 04h20m37s
       Cost: 20              Preference: 10
      IpPre: N/A             QosLocalID: N/A
        Tag: 0                    State: Active Adv
  OrigTblID: 0x0                OrigVrf: default-vrf
    TableID: 0x2                 OrigAs: 0
      NibID: 0x26000002          LastAs: 0
     AttrID: 0xffffffff        Neighbor: 0.0.0.0
      Flags: 0x1008c        OrigNextHop: 10.1.1.100
      Label: NULL           RealNextHop: 10.1.1.100
    BkLabel: NULL             BkNextHop: N/A
    SRLabel: NULL             BkSRLabel: NULL
   SIDIndex: NULL               InLabel: NULL
  Tunnel ID: Invalid          Interface: Vlan-interface11
BkTunnel ID: Invalid        BkInterface: N/A
   FtnIndex: 0x0           TrafficIndex: N/A
  Connector: N/A                 PathID: 0x0
   LinkCost: 0               MicroSegID: 0