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Cyber_Security_Notes/B. 第二阶段/拓扑练习/0828_BFD和VRRP.md
Noriu e1073ebd89 2024年8月28日 16:41:57
2024-08-28 16:42:00 +08:00

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BFD和VRRP

image-20240828162230655

一、PC`s IP

二、VLAN

  • SW3

    [SW3]vlan 10
[SW3-vlan10]quit
[SW3]port-group group-member g0/0/1 g0/0/2
[SW3-port-group]port link-type access 
[SW3-port-group]port default vlan 10
[SW3-port-group]quit
[SW3]port-group group-member g0/0/3 g0/0/4	
[SW3-port-group]port link-type trunk 
[SW3-port-group]port trunk allow-pass vlan all

三、VRRP

  • SW1

    [SW1]vlan 10
[SW1-vlan10]quit
[SW1]int g0/0/1
[SW1-GigabitEthernet0/0/1]port link-type trunk 
[SW1-GigabitEthernet0/0/1]port trunk allow-pass vlan all
[SW1-GigabitEthernet0/0/1]quit
[SW1]int vlan 10
[SW1-Vlanif10]ip add 192.168.10.254 24
[SW1-Vlanif10]vrrp vrid 10 virtual-ip 192.168.10.254	
[SW1-Vlanif10]vrrp vrid 10 priority 130

  • SW2

    [SW2]vlan 10
[SW2-vlan10]quit
[SW2]int g0/0/1
[SW2-GigabitEthernet0/0/1]port link-type trunk 
[SW2-GigabitEthernet0/0/1]port trunk allow-pass vlan all
[SW2-GigabitEthernet0/0/1]quit
[SW2]int vlan 10
[SW2-Vlanif10]ip add 192.168.10.252 24
[SW2-Vlanif10]vrrp vrid 10 virtual-ip 192.168.10.254

四、BFD

  • SW1

    [SW1]bfd
[SW1-bfd]quit
[SW1]bfd ntd2407 bind peer-ip 192.168.10.252
[SW1-bfd-session-ntd2407]discriminator local 1
[SW1-bfd-session-ntd2407]discriminator remote 2
[SW1-bfd-session-ntd2407]min-tx-interval 100
[SW1-bfd-session-ntd2407]min-rx-interval 100
[SW1-bfd-session-ntd2407]commit

  • SW2

    [SW2]bfd
[SW2-bfd]quit
[SW2]bfd ntd2407 bind peer-ip 192.168.10.251	
[SW2-bfd-session-ntd2407]discriminator local 2
[SW2-bfd-session-ntd2407]discriminator remote 1
[SW2-bfd-session-ntd2407]min-tx-interval 100
[SW2-bfd-session-ntd2407]min-rx-interval 100
[SW2-bfd-session-ntd2407]commit

五、BFD与VRRP联动

  • SW2

    [SW2]int vlan 10
[SW2-Vlanif10]vrrp vrid 10 track bfd-session 2 increased 60

    解释：

    1. [SW2]int vlan 10
      • 进入交换机的VLAN接口配置模式，针对VLAN 10。
    2. [SW2-Vlanif10]vrrp vrid 10 track bfd-session 2 increased 60
      • 在VLAN接口10上配置VRRP虚拟路由器ID为10，并设置对BFD会话2的跟踪。
      • track bfd-session 2：指定跟踪的BFD会话，这里的会话ID是2。
      • increased 60：当BFD会话2的状态变为Down时，VRRP的优先级将增加60。这通常用于确保当主链路出现问题时，备份链路能够接管，提高其VRRP优先级，从而成为新的主路由器。

    这个配置的作用是，当BFD会话2检测到链路故障时，VRRP的优先级会增加，这有助于VRRP组中的备用路由器成为新的主路由器，从而保证网络的连续性和可靠性。

    请注意，这个配置假设BFD会话2已经正确配置，并且与VRRP虚拟路由器关联的接口是VLAN 10。如果BFD会话状态变为Down，VRRP优先级的增加将触发VRRP主备切换。

六、完备性测试

  • SW1

    [SW1]dis vrrp
  Vlanif10 | Virtual Router 10
    State : Master
    Virtual IP : 192.168.10.254
    Master IP : 192.168.10.254
    PriorityRun : 255
    PriorityConfig : 130
    MasterPriority : 255
    Preempt : YES   Delay Time : 0 s
    TimerRun : 1 s
    TimerConfig : 1 s
    Auth type : NONE
    Virtual MAC : 0000-5e00-010a
    Check TTL : YES
    Config type : normal-vrrp
    Create time : 2024-08-28 15:57:41 UTC-08:00
    Last change time : 2024-08-28 16:13:44 UTC-08:00

  • SW2

    [SW2]dis vrrp
  Vlanif10 | Virtual Router 10
    State : Backup
    Virtual IP : 192.168.10.254
    Master IP : 192.168.10.254
    PriorityRun : 100
    PriorityConfig : 100
    MasterPriority : 255
    Preempt : YES   Delay Time : 0 s
    TimerRun : 1 s
    TimerConfig : 1 s
    Auth type : NONE
    Virtual MAC : 0000-5e00-010a
    Check TTL : YES
    Config type : normal-vrrp
    Track BFD : 2  Priority increased : 60
    BFD-session state : INITIALIZE
    Create time : 2024-08-28 15:55:20 UTC-08:00
    Last change time : 2024-08-28 16:28:55 UTC-08:00

七、功能性测试

image-20240828163927888

  • SW1

    [SW1]dis vrrp
  Vlanif10 | Virtual Router 10
    State : Initialize
    Virtual IP : 192.168.10.254
    Master IP : 0.0.0.0
    PriorityRun : 255
    PriorityConfig : 130
    MasterPriority : 0
    Preempt : YES   Delay Time : 0 s
    TimerRun : 1 s
    TimerConfig : 1 s
    Auth type : NONE
    Virtual MAC : 0000-5e00-010a
    Check TTL : YES
    Config type : normal-vrrp
    Create time : 2024-08-28 15:57:41 UTC-08:00
    Last change time : 2024-08-28 16:39:16 UTC-08:00

  • SW2

    [SW2]dis vrrp
  Vlanif10 | Virtual Router 10
    State : Master
    Virtual IP : 192.168.10.254
    Master IP : 192.168.10.252
    PriorityRun : 100
    PriorityConfig : 100
    MasterPriority : 100
    Preempt : YES   Delay Time : 0 s
    TimerRun : 1 s
    TimerConfig : 1 s
    Auth type : NONE
    Virtual MAC : 0000-5e00-010a
    Check TTL : YES
    Config type : normal-vrrp
    Track BFD : 2  Priority increased : 60
    BFD-session state : INITIALIZE
    Create time : 2024-08-28 15:55:20 UTC-08:00
    Last change time : 2024-08-28 16:39:17 UTC-08:00