华三核心交换机可靠性及负载均衡如何配置

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 组网需求

由于公司人员激增，接入层交换机提供的端口数目已经不能满足PC的接入需求。现需要在保护现有投资的基础上扩展端口接入数量，并要求网络易管理、易维护。

2. 组网图

图1-17 IRF典型配置组网图（LACP MAD检测方式）

3. 配置思路

·            Device A提供的接入端口数目已经不能满足网络需求，需要另外增加一台设备Device B。（本文以两台设备组成IRF为例，在实际组网中可以根据需要，将多台设备组成IRF，配置思路和配置步骤与本例类似）

·            鉴于第二代智能弹性架构IRF技术具有管理简便、网络扩展能力强、可靠性高等优点，所以本例使用IRF技术构建接入层（即在Device A和Device B上配置IRF功能）。

·            为了防止万一IRF链路故障导致IRF分裂、网络中存在两个配置冲突的IRF，需要启用MAD检测功能。因为接入层设备较多，我们采用LACP MAD检测。

4. 配置步骤

(1)       配置Device A

# 配置Device A的成员编号为1，创建IRF端口2，并将它与物理端口Ten-GigabitEthernet3/0/1绑定。

<Sysname> system-view

[Sysname] irf member 1

[Sysname] irf-port 2

[Sysname-irf-port2] port group interface ten-gigabitethernet 3/0/1

[Sysname-irf-port2] quit

# 将当前配置保存到下次启动配置文件。

[Sysname] quit

<Sysname> save

# 将设备的运行模式切换到IRF模式。

<Sysname> system-view

[Sysname] chassis convert mode irf

The device will switch to IRF mode and reboot.

You are recommended to save the current running configuration and specify the configuration file for the next startup. Continue? [Y/N]:y

Please input the file name(*.cfg)[flash:/startup.cfg]

(To leave the existing filename unchanged, press the enter key):

flash:/startup.cfg exists, overwrite? [Y/N]:y

Validating file. Please wait...

Saved the current configuration to mainboard device successfully.

Do you want to convert the content of the next startup configuration file flash:

/startup.cfg to make it available in IRF mode? [Y/N]:y                 

Now rebooting, please wait...

设备重启后Device A组成了只有一台成员设备的IRF。

(2)       配置Device B

# 配置Device B的成员编号为2，创建IRF端口1，并将它与物理端口Ten-GigabitEthernet3/0/1绑定。

<Sysname> system-view

[Sysname] irf member 2

[Sysname] irf-port 1

[Sysname-irf-port1] port group interface ten-gigabitethernet 3/0/1

[Sysname-irf-port1] quit

# 将当前配置保存到下次启动配置文件。

[Sysname] quit

<Sysname> save

# 参照图1-17进行物理连线。

# 将设备的运行模式切换到IRF模式。

<Sysname> system-view

[Sysname] chassis convert mode irf

The device will switch to IRF mode and reboot.

You are recommended to save the current running configuration and specify the configuration file for the next startup. Continue? [Y/N]:y

Please input the file name(*.cfg)[flash:/startup.cfg]

(To leave the existing filename unchanged, press the enter key):

flash:/startup.cfg exists, overwrite? [Y/N]:y

Validating file. Please wait...

Saved the current configuration to mainboard device successfully.

Do you want to convert the content of the next startup configuration file flash:

/startup.cfg to make it available in IRF mode? [Y/N]:y                 

Now rebooting, please wait...

设备B重启后与设备A形成IRF。

(3)       配置LACP MAD检测

# 设置IRF域编号为1。

<Sysname> system-view

[Sysname] irf domain 1

# 创建一个动态聚合接口，并开启LACP MAD检测功能。

[Sysname] interface bridge-aggregation 2

[Sysname-Bridge-Aggregation2] link-aggregation mode dynamic

[Sysname-Bridge-Aggregation2] mad enable

You need to assign a domain ID (range: 0-4294967295)

[Current domain ID is: 1]:

The assigned domain ID is: 1

[Sysname-Bridge-Aggregation2] quit

# 在聚合接口中添加成员端口1/4/0/2和2/4/0/2，专用于Device A和Device B实现LACP MAD检测。

[Sysname] interface gigabitethernet 1/4/0/2

[Sysname-GigabitEthernet1/4/0/2] port link-aggregation group 2

[Sysname-GigabitEthernet1/4/0/2] quit

[Sysname] interface gigabitethernet 2/4/0/2

[Sysname-GigabitEthernet2/4/0/2] port link-aggregation group 2

(4)       配置中间设备Device C

Device C作为中间设备来转发、处理LACP协议报文，协助Device A和Device B进行多Active检测。从节约成本的角度考虑，使用一台支持LACP协议扩展功能的交换机即可。

# 创建一个动态聚合接口。

<Sysname> system-view

[Sysname] interface bridge-aggregation 2

[Sysname-Bridge-Aggregation2] link-aggregation mode dynamic

[Sysname-Bridge-Aggregation2] quit

# 在聚合接口中添加成员端口GigabitEthernet4/0/1和GigabitEthernet4/0/2，用于帮助LACP MAD检测。

[Sysname] interface gigabitethernet 4/0/1

[Sysname-GigabitEthernet4/0/1] port link-aggregation group 2

[Sysname-GigabitEthernet4/0/1] quit

[Sysname] interface gigabitethernet 4/0/2

[Sysname-GigabitEthernet4/0/2] port link-aggregation group 2