配置Dot1q终结子接口支持BFD示例

NE20E-S2 V800R011C10 配置指南 - 网络可靠性 02

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配置Dot1q终结子接口支持BFD示例

本示例中，通过配置Dot1q终结子接口支持BFD后，保证传输带有一层Tag报文的链路的可靠性和稳定性。

组网需求

如图3-12所示，VLAN10的用户通过缺省网关访问ISP网络。其中，DeviceA的GE0/2/0.1为Dot1q终结子接口，DeviceB的GE0/2/0.1为Dot1q终结子接口。

需求如下：

在DeviceA和DeviceB上配置BFD会话，检测设备之间的链路。
在DeviceA上配置VRRP备份组1，使其为Master设备；在DeviceB上配置VRRP备份组1，使其为Backup设备。
分别在DeviceA和DeviceB上配置VRRP备份组1监视BFD会话。

图3-12 配置Dot1q终结子接口支持BFD组网图

本例中interface1，interface2分别代表GE0/1/0，GE0/2/0。

本例中subinterface2.1代表GE0/2/0.1。

配置思路

采用如下的思路配置Dot1q终结子接口支持BFD的基本功能：

配置IGP，使得DeviceA、DeviceB和DeviceC设备之间可以互通。
配置Switch二层转发功能。
配置DeviceA和DeviceB的Dot1q终结子接口。
在DeviceA和DeviceB上创建BFD会话，检测DeviceA和DeviceB之间的链路。
分别在DeviceA和DeviceB的GE0/2/0.1接口上创建VRRP备份组1，确保DeviceA为Master设备，DeviceB为Backup设备。

数据准备

为完成此配置例，需准备如下的数据：

Dot1q终结子接口终结的Tag值
BFD会话的名称
VRRP备份组号、虚拟IP地址

操作步骤

配置设备之间的网络互连

如图3-12所示，配置各设备接口的IP地址。配置DeviceA、DeviceB和DeviceC之间的IGP，本例采用OSPF。

# 配置DeviceA。

<HUAWEI> system-view

[~HUAWEI] sysname DeviceA

[*HUAWEI] commit

[~DeviceA] interface gigabitethernet 0/1/0

[~DeviceA-GigabitEthernet0/1/0] undo shutdown

[*DeviceA-GigabitEthernet0/1/0] ip address 192.168.2.1 24

[*DeviceA-GigabitEthernet0/1/0] quit

[*DeviceA] interface gigabitethernet 0/2/0.1

[*DeviceA-GigabitEthernet0/2/0.1] undo shutdown

[*DeviceA-GigabitEthernet0/2/0.1] ip address 10.1.1.1 24

[*DeviceA-GigabitEthernet0/2/0.1] quit

[*DeviceA] ospf 1

[*DeviceA-ospf-1] area 0

[*DeviceA-ospf-1-area-0.0.0.0] network 192.168.2.0 0.0.0.255

[*DeviceA-ospf-1-area-0.0.0.0] network 10.1.1.0 0.0.0.255

[*DeviceA-ospf-1-area-0.0.0.0] commit

[~DeviceA-ospf-1-area-0.0.0.0] quit

[~DeviceA-ospf-1] quit

# 配置DeviceB。

<HUAWEI> system-view

[~HUAWEI] sysname DeviceB

[*HUAWEI] commit

[~DeviceB] interface gigabitethernet 0/1/0

[*DeviceB-GigabitEthernet0/1/0] undo shutdown

[*DeviceB-GigabitEthernet0/1/0] ip address 192.168.1.1 24

[*DeviceB-GigabitEthernet0/1/0] quit

[*DeviceB] interface gigabitethernet 0/2/0.1

[*DeviceB-GigabitEthernet0/2/0.1] undo shutdown

[*DeviceB-GigabitEthernet0/2/0.1] ip address 10.1.1.2 24

[*DeviceB-GigabitEthernet0/2/0.1] quit

[*DeviceB] ospf 1

[*DeviceB-ospf-1] area 0

[*DeviceB-ospf-1-area-0.0.0.0] network 192.168.1.0 0.0.0.255

[*DeviceB-ospf-1-area-0.0.0.0] network 10.1.1.0 0.0.0.255

[*DeviceB-ospf-1-area-0.0.0.0] commit

[~DeviceB-ospf-1-area-0.0.0.0] quit

[~DeviceB-ospf-1] quit

# 配置DeviceC。

<HUAWEI> system-view

[~HUAWEI] sysname DeviceC

[*HUAWEI] commit

[~DeviceC] interface gigabitethernet 0/1/0

[~DeviceC-GigabitEthernet0/1/0] undo shutdown

[*DeviceC-GigabitEthernet0/1/0] ip address 192.168.2.2 24

[*DeviceC-GigabitEthernet0/1/0] quit

[*DeviceC] interface gigabitethernet 0/2/0

[*DeviceC-GigabitEthernet0/2/0] undo shutdown

[*DeviceC-GigabitEthernet0/2/0] ip address 192.168.1.2 24

[*DeviceC-GigabitEthernet0/2/0] quit

[*DeviceC] ospf 1

[*DeviceC-ospf-1] area 0

[*DeviceC-ospf-1-area-0.0.0.0] network 192.168.1.0 0.0.0.255

[*DeviceC-ospf-1-area-0.0.0.0] network 192.168.2.0 0.0.0.255

[*DeviceC-ospf-1-area-0.0.0.0] commit

[~DeviceC-ospf-1-area-0.0.0.0] quit

[~DeviceC-ospf-1] quit

配置完成后，DeviceA和DeviceB相互之间有OSPF协议发现到对端IP的路由，并能互相Ping通。

以DeviceA的显示为例。

<DeviceA> display ip routing-table

Route Flags: R - relay, D - download to fib, T - to vpn-instance, B - black hole route
------------------------------------------------------------------------------
Routing Tables: Public
         Destinations : 7       Routes : 7

Destination/Mask    Proto  Pre  Cost       Flags NextHop         Interface
    192.168.2.0/24  Direct 0    0            D   192.168.2.1     GigabitEthernet0/1/0
    192.168.2.1/32  Direct 0    0            D   127.0.0.1       InLoopBack0
    192.168.1.0/24  OSPF   10   2            D   192.168.2.2     GigabitEthernet0/1/0
       10.1.1.0/24  Direct 0    0            D   10.1.1.1        GigabitEthernet0/2/0.1
       10.1.1.1/32  Direct 0    0            D   127.0.0.1       InLoopBack0
      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

[~DeviceA] ping 192.168.1.1

PING 192.168.1.1: 56  data bytes, press CTRL_C to break
    Reply from 192.168.1.1: bytes=56 Sequence=1 ttl=254 time=7 ms
    Reply from 192.168.1.1: bytes=56 Sequence=2 ttl=254 time=1 ms
    Reply from 192.168.1.1: bytes=56 Sequence=3 ttl=254 time=5 ms
    Reply from 192.168.1.1: bytes=56 Sequence=4 ttl=254 time=1 ms
    Reply from 192.168.1.1: bytes=56 Sequence=5 ttl=254 time=8 ms

  --- 192.168.1.1 ping statistics ---
    5 packet(s) transmitted
    5 packet(s) received
    0.00% packet loss
    round-trip min/avg/max = 1/4/8 ms

配置Switch二层转发功能

<HUAWEI> system-view

[~HUAWEI] sysname Switch

[*HUAWEI] commit

[~Switch] vlan 10

[*Switch-vlan10] port gigabitethernet 0/1/0

[*Switch-vlan10] quit

[*Switch] interface gigabitethernet 0/1/1

[*Switch-GigabitEthernet0/1/1] undo shutdown

[*Switch-GigabitEthernet0/1/1] port trunk allow-pass vlan 10

[*Switch-GigabitEthernet0/1/1] quit

[*Switch] interface gigabitethernet 0/1/2

[*Switch-GigabitEthernet0/1/2] undo shutdown

[*Switch-GigabitEthernet0/1/2] port trunk allow-pass vlan 10

[*Switch-GigabitEthernet0/1/2] commit

[~Switch-GigabitEthernet0/1/2] quit

配置Dot1q终结子接口

# 配置DeviceA。

[~DeviceA] interface gigabitethernet 0/2/0.1

[*DeviceA-GigabitEthernet0/2/0.1] control-vid 1 dot1q-termination

[*DeviceA-GigabitEthernet0/2/0.1] dot1q termination vid 10

[*DeviceA-GigabitEthernet0/2/0.1] commit

# 配置DeviceB。

[~DeviceB] interface gigabitethernet 0/2/0.1

[*DeviceB-GigabitEthernet0/2/0.1] control-vid 1 dot1q-termination

[*DeviceB-GigabitEthernet0/2/0.1] dot1q termination vid 10

[*DeviceB-GigabitEthernet0/2/0.1] commit

配置BFD会话

# 配置DeviceA。

[~DeviceA] bfd

[*DeviceA-bfd] quit

[*DeviceA] bfd atob bind peer-ip default-ip interface gigabitethernet 0/2/0.1

[*DeviceA-bfd-session-atob] discriminator local 1

[*DeviceA-bfd-session-atob] discriminator remote 2

[*DeviceA-bfd-session-atob] dot1q vid 10

[*DeviceA-bfd-session-atob] commit

[~DeviceA-bfd-session-atob] quit

# 配置DeviceB。

[~DeviceB] bfd

[*DeviceB-bfd] quit

[*DeviceB] bfd atob bind peer-ip default-ip interface gigabitethernet 0/2/0.1

[*DeviceB-bfd-session-atob] discriminator local 2

[*DeviceB-bfd-session-atob] discriminator remote 1

[*DeviceB-bfd-session-atob] dot1q vid 10

[*DeviceB-bfd-session-atob] commit

[~DeviceB-bfd-session-atob] quit

完成配置后，执行display bfd session all verbose命令，可以查看到BFD会话的状态为Up。以DeviceA的显示为例。

[~DeviceA] display bfd session all verbose

(w): State in WTR 
(*): State is invalid
--------------------------------------------------------------------------------
  (One Hop)   State : UP                  Name : atob
--------------------------------------------------------------------------------
  Local Discriminator    : 1                Remote Discriminator   : 2
  Session Detect Mode    : Asynchronous Mode Without Echo Function
  BFD Bind Type          : Interface(0/2/0)  
  Bind Session Type      : Static 
  Bind Peer IP Address   : 10.1.1.2      
  Bind Interface         : 0/2/0                            
  Vid                    : 10  
  FSM Board Id           : 6                TOS-EXP                : 7
  Min Tx Interval (ms)   : 10               Min Rx Interval (ms)   : 10
  Actual Tx Interval (ms): 10               Actual Rx Interval (ms): 10 
  Local Detect Multi     : 50               Detect Interval (ms)   : 500 
  Echo Passive           : Disable          Acl Number             : -
  Destination Port       : 3784             TTL                    : 255 
  Proc Interface Status  : Disable          Process PST            : Disable    
  WTR Interval (ms)      : -                Config PST             : Disable    
  Active Multi           : 50   
  Last Local Diagnostic  : No Diagnostic
  Bind Application       : No Application Bind
  Session TX TmrID       : -                Session Detect TmrID   : - 
  Session Init TmrID     : -                Session WTR TmrID      : - 
  Session Echo Tx TmrID  : -   
  Session Description    : - 
--------------------------------------------------------------------------------

     Total UP/DOWN Session Number : 1/0

配置VRRP备份组1监视BFD会话

# 配置DeviceA。

[~DeviceA] interface gigabitethernet 0/2/0.1

[*DeviceA-GigabitEthernet0/2/0.1] dot1q vrrp vid 10

[*DeviceA-GigabitEthernet0/2/0.1] vrrp vrid 1 virtual 10.1.1.100

[*DeviceA-GigabitEthernet0/2/0.1] vrrp vrid 1 priority 160

[*DeviceA-GigabitEthernet0/2/0.1] vrrp vrid 1 track bfd-session 1

[*DeviceA-GigabitEthernet0/2/0.1] arp broadcast enable

[*DeviceA-GigabitEthernet0/2/0.1] commit

[~DeviceA-GigabitEthernet0/2/0.1] quit

# 配置DeviceB。

[~DeviceB] interface gigabitethernet 0/2/0.1

[*DeviceB-GigabitEthernet0/2/0.1] dot1q vrrp vid 10

[*DeviceB-GigabitEthernet0/2/0.1] vrrp vrid 1 virtual 10.1.1.100

[*DeviceB-GigabitEthernet0/2/0.1] vrrp vrid 1 track bfd-session 2

[*DeviceB-GigabitEthernet0/2/0.1] arp broadcast enable

[*DeviceB-GigabitEthernet0/2/0.1] commit

[~DeviceB-GigabitEthernet0/2/0.1] quit

验证配置结果

执行display vrrp命令，可以查看到VRRP备份组监视的BFD会话的状态为Up。以DeviceA的显示为例。

[~DeviceA] display vrrp

GigabitEthernet0/1/0 | Virtual Device 1
State             : Master
Virtual IP        : 10.1.1.100
Master IP         : 192.168.2.1
Local IP          : 192.168.2.1
PriorityRun       : 160
PriorityConfig    : 160
MasterPriority    : 160
Preempt           : YES                     Delay Time : 0s
Hold Multiplier   : 4
TimerRun          : 1s
TimerConfig       : 1s
Auth Type         : NONE
Virtual MAC       : 00e0-fc12-7890
Check TTL         : YES
Config Type       : normal-vrrp
Backup-forward    : disabled
Track IF          : GigabitEthernet0/1/0Priority Reduced :20
IF State          : DOWN
Track BFD         : 0                Priority Reduced :10
BFD-Session State : UP
Create Time         : 2011-12-29 05:41:23
Last Change Time    : 2011-12-29 05:41:33

配置文件

DeviceA的配置文件

#
 sysname DeviceA
#
bfd
#
interface GigabitEthernet 0/1/0
 undo shutdown
 ip address 192.168.2.1 24
#
interface GigabitEthernet0/2/0
 undo shutdown
#
interface GigabitEthernet0/2/0.1
 undo shutdown
 encapsulation dot1q-termination
 dot1q termination vid 10
 dot1q vrrp vid 10
 ip address 10.1.1.1 24
 vrrp vrid 1 virtual 10.1.1.100
 vrrp vrid 1 priority 160
 vrrp vrid 1 track bfd-session 1
 arp broadcast enable
#
bfd atob bind peer-ip default-ip interface gigabitethernet 0/2/0.1
 discriminator local 1
 discriminator remote 2
 dot1q vid 10
 commit
#
ospf 1
 area 0.0.0.0
 network 192.168.2.0 0.0.0.255
 network 10.1.1.0 0.0.0.255
#
return

DeviceB的配置文件

#
 sysname DeviceB
#
bfd
#
interface GigabitEthernet 0/1/0
 undo shutdown
 ip address 192.168.1.1 24
#
interface GigabitEthernet0/2/0
 undo shutdown
#
interface GigabitEthernet0/2/0.1
 undo shutdown
 encapsulation dot1q-termination
 dot1q termination vid 10
 dot1q vrrp vid 10
 ip address 10.1.1.2 24
 vrrp vrid 1 virtual 10.1.1.100
 vrrp vrid 1 track bfd-session 2
 arp broadcast enable
#
bfd atob bind peer-ip default-ip interface gigabitethernet 0/2/0.1
 discriminator local 2
 discriminator remote 1
 dot1q vid 10
 commit
#
ospf 1
 area 0.0.0.0
 network 192.168.1.0 0.0.0.255
 network 10.1.1.0 0.0.0.255
#
return

DeviceC的配置文件

#
 sysname DeviceC
#
bfd
#
interface GigabitEthernet 0/1/0
 undo shutdown
 ip address 192.168.2.2 24
#
interface GigabitEthernet 0/2/0
 undo shutdown
 ip address 192.168.1.2 24
#
ospf 1
 area 0.0.0.0
 network 192.168.1.0 0.0.0.255
 network 192.168.2.0 0.0.0.255
#
return

Switch的配置文件

#
 sysname Switch
#
vlan batch 10
#
interface GigabitEthernet0/1/0
 undo shutdown
 port default vlan 10
#
interface GigabitEthernet0/1/1
 undo shutdown
 port trunk allow-pass vlan 10
#
interface GigabitEthernet0/1/2
 undo shutdown
 port trunk allow-pass vlan 10
#
return

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更新时间：2020-02-07

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