定义
Smart Link，又叫做备份链路。一个Smart Link由两个接口组成，其中一个接口作为另一个的备份。Smart Link常用于双上行组网，提供可靠高效的备份和快速的切换机制。
目的
下游设备连接到上游设备，当使用单上行方式时，若出现单点故障，会造成业务中断。若采用双上行方式，将一台下游设备同时连接到两台上游设备，可降低单点故障对网络的影响，提高了可靠性。
组网需求
如下图所示，为了保证网络的可靠性，用户侧网络采用双上行方式组网。用户希望能够破除网络环路，实现主备链路冗余备份和快速收敛。
配置思路
采用如下的思路配置Smart Link功能：
-
创建VLAN，并配置接口允许相应VLAN通过。
-
在SwitchA上创建Smart Link备份组，并指定端口角色。
-
在SwitchA上使能回切功能，使得故障恢复后，流量切换到相对稳定的原主链路上。
-
在SwitchA上使能发送Flush报文功能。
-
在SwitchB、SwitchC和SwitchD三台设备对应端口上使能Flush报文接收功能。
-
在SwitchA上使能Smart Link组功能。
操作步骤
- 配置VLAN信息
# 在SwitchA上创建VLAN，并配置接口允许相应VLAN通过。SwitchB、SwitchC和SwitchD的配置与SwitchA类似，详见配置文件。
<Huawei>system-view
[Huawei]sysname SwitchA
[SwitchA]vlan batch 10 to 30
[SwitchA]interface GigabitEthernet 0/0/1
[SwitchA-GigabitEthernet0/0/1]port link-type trunk
[SwitchA-GigabitEthernet0/0/1]port trunk allow-pass vlan 10 to 30
[SwitchA-GigabitEthernet0/0/1]quit
[SwitchA]interface GigabitEthernet 0/0/2
[SwitchA-GigabitEthernet0/0/2]port link-type trunk
[SwitchA-GigabitEthernet0/0/2]port trunk allow-pass vlan 10 to 30
[SwitchA-GigabitEthernet0/0/2]quit- 在SwitchA上创建Smart Link备份组，并指定端口角色
# 配置SwitchA
[SwitchA]interface GigabitEthernet 0/0/1
[SwitchA-GigabitEthernet0/0/1]stp disable
[SwitchA-GigabitEthernet0/0/1]quit
[SwitchA]interface GigabitEthernet 0/0/2
[SwitchA-GigabitEthernet0/0/2]stp disable
[SwitchA-GigabitEthernet0/0/2]quit
[SwitchA]smart-link group 1
[SwitchA-smlk-group1]port GigabitEthernet 0/0/1 master
[SwitchA-smlk-group1]port GigabitEthernet 0/0/2 slave - 使能回切功能并设置回切时间
# 配置SwitchA。
[SwitchA-smlk-group1]restore enable
[SwitchA-smlk-group1]timer wtr 30- 使能发送Flush报文功能
# 配置SwitchA，并指定发送Flush报文的密码为SHA加密方式。
[SwitchA-smlk-group1]flush send control-vlan 10 password simple huawei@123- 使能接收Flush报文功能
# 配置SwitchB，并指定接收Flush报文的密码为SHA加密方式。
[SwitchB]interface GigabitEthernet 0/0/1
[SwitchB-GigabitEthernet0/0/1]smart-link flush receive control-vlan 10 password
simple huawei@123
[SwitchB-GigabitEthernet0/0/1]stp disable
[SwitchB-GigabitEthernet0/0/1]quit
[SwitchB]interface GigabitEthernet 0/0/2
[SwitchB-GigabitEthernet0/0/2]smart-link flush receive control-vlan 10 password
simple huawei@123
[SwitchB-GigabitEthernet0/0/2]stp disable
[SwitchB-GigabitEthernet0/0/2]quit
# 配置SwitchC，并指定接收Flush报文的密码为SHA加密方式。
[SwitchC]interface GigabitEthernet 0/0/1
[SwitchC-GigabitEthernet0/0/1]smart-link flush receive control-vlan 10 password
simple huawei@123
[SwitchC-GigabitEthernet0/0/1]stp disable
[SwitchC-GigabitEthernet0/0/1]quit
[SwitchC]interface GigabitEthernet 0/0/2
[SwitchC-GigabitEthernet0/0/2]smart-link flush receive control-vlan 10 password
simple huawei@123
[SwitchC-GigabitEthernet0/0/2]stp disable
[SwitchC-GigabitEthernet0/0/2]quit
# 配置SwitchD，并指定接收Flush报文的密码为SHA加密方式。
[Huawei]interface GigabitEthernet 0/0/1
[Huawei-GigabitEthernet0/0/1]smart-link flush receive control-vlan 10 password s
imple huawei@123
[Huawei-GigabitEthernet0/0/1]stp disable
[Huawei-GigabitEthernet0/0/1]quit
[Huawei]interface GigabitEthernet 0/0/2
[Huawei-GigabitEthernet0/0/2]smart-link flush receive control-vlan 10 password s
imple huawei@123
[Huawei-GigabitEthernet0/0/2]stp disable
[Huawei-GigabitEthernet0/0/2]quit
- 在SwitchA使能Smart Link组功能
[SwitchA-smlk-group1]smart-link enable
[SwitchA-smlk-group1]quit- 验证配置结果
# 使用display smart-link group命令查看SwitchA上的Smart Link组信息。如果显示如下信息，则表示配置成功。
- Smart Link组功能已经使能
- 回切时间为30秒
- 控制VLAN编号为10
- 接口GE0/0/1为主接口且处于Active状态，接口GE0/0/2为从接口且处于Inactive。
[SwitchA]display smart-link group 1
Smart Link group 1 information :
Smart Link group was enabled
Wtr-time is: 30 sec.
There is no Load-Balance
There is no protected-vlan reference-instance
DeviceID: 4c1f-ccd4-08f7 Control-vlan ID: 10
Member Role State Flush Count Last-Flush-Time
----------------------------------------------------------------------
GigabitEthernet0/0/1 Master Active 1 2023/12/08 16:08:26 UTC-08
:00
GigabitEthernet0/0/2 Slave Inactive 0 0000/00/00 00:00:00 UTC+00
:00
# 使用shutdown命令关闭接口GE0/0/1，可以看到接口GE0/0/1已经处于Inactive状态，接口GE0/0/2为Active状态。
[SwitchA]interface GigabitEthernet 0/0/1
[SwitchA-GigabitEthernet0/0/1]shutdown
[SwitchA-GigabitEthernet0/0/1]display smart-link group 1
Smart Link group 1 information :
Smart Link group was enabled
Wtr-time is: 30 sec.
There is no Load-Balance
There is no protected-vlan reference-instance
DeviceID: 4c1f-ccd4-08f7 Control-vlan ID: 10
Member Role State Flush Count Last-Flush-Time
----------------------------------------------------------------------
GigabitEthernet0/0/1 Master Inactive 1 2023/12/08 16:08:26 UTC-08
:00
GigabitEthernet0/0/2 Slave Active 0 0000/00/00 00:00:00 UTC+00
:00 # 使用undo shutdown命令开启接口GE0/0/1。
[SwitchA-GigabitEthernet0/0/1]undo shutdown# 等待30秒后，可以看到接口GE0/0/1处于Active状态，接口GE0/0/2为Inactive状态。
[SwitchA]display smart-link group 1
Smart Link group 1 information :
Smart Link group was enabled
Wtr-time is: 30 sec.
There is no Load-Balance
There is no protected-vlan reference-instance
DeviceID: 4c1f-ccd4-08f7 Control-vlan ID: 10
Member Role State Flush Count Last-Flush-Time
----------------------------------------------------------------------
GigabitEthernet0/0/1 Master Active 2 2023/12/08 16:12:21 UTC-08
:00
GigabitEthernet0/0/2 Slave Inactive 1 2023/12/08 16:11:27 UTC-08
:00 配置文件
-
SwitchA的配置文件
#
sysname SwitchA
#
vlan batch 10 to 30
#
interface GigabitEthernet0/0/1
port link-type trunk
port trunk allow-pass vlan 10 to 30
stp disable
#
interface GigabitEthernet0/0/2
port link-type trunk
port trunk allow-pass vlan 10 to 30
stp disable
#
smart-link group 1
restore enable
smart-link enable
port GigabitEthernet0/0/1 master
port GigabitEthernet0/0/2 slave
timer wtr 30
flush send control-vlan 10 password simple huawei@123
#
return-
SwitchB的配置文件
#
sysname SwitchB
#
vlan batch 10 to 30
#
interface GigabitEthernet0/0/1
port link-type trunk
port trunk allow-pass vlan 10 to 30
stp disable
smart-link flush receive control-vlan 10 password simple huawei@123
#
interface GigabitEthernet0/0/2
port link-type trunk
port trunk allow-pass vlan 10 to 30
stp disable
smart-link flush receive control-vlan 10 password simple huawei@123
#
return-
SwitchC的配置文件
#
sysname SwitchC
#
vlan batch 10 to 30
#
interface GigabitEthernet0/0/1
port link-type trunk
port trunk allow-pass vlan 10 to 30
stp disable
smart-link flush receive control-vlan 10 password simple huawei@123
#
interface GigabitEthernet0/0/2
port link-type trunk
port trunk allow-pass vlan 10 to 30
stp disable
smart-link flush receive control-vlan 10 password simple huawei@123
#
return
