H3C S7500使用四台设备搭建IRF典型配置举例（BFD MAD检测方式）

一、组网图

二、 配置思路

 • Device A 处于局域网的汇聚层，为了将汇聚层的转发能力提高三倍，需要另外增加三台设备 Device B、Device C 和Device D。
• 鉴于智能弹性架构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 技术构建网络汇聚层（即在四台设备上配置IRF 功能），接入层设备通过聚合双链路上 行。
• 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。这里采用BFD MAD 检测方式来监测IRF 的状态。
• 通过配置 IRF 优先级，保证DeviceA 成为IRF 中的Master 设备。
• 当 IRF 链路出现故障后，首先修复IRF 链路，然后重启Recovery 状态的设备，使其重新加入 IRF。

 三、配置命令

(1) 配置Device A

# 设置Device A 的成员编号为1，创建IRF 端口1 和2，并分别与物理端口Ten-GigabitEthernet3/0/1和Ten-GigabitEthernet3/0/2 绑定。
<Sysname> system-view
[Sysname] irf member 1
Info: Member ID change will take effect after the member reboots and operates in IRF mode.
[Sysname] interface ten-gigabitethernet 3/0/1
[Sysname-Ten-GigabitEthernet3/0/1] shutdown
[Sysname-Ten-GigabitEthernet3/0/1] quit
[Sysname] irf-port 1
[Sysname-irf-port1] port group interface ten-gigabitethernet 3/0/1
[Sysname-irf-port1] quit
[Sysname] interface ten-gigabitethernet 3/0/1
[Sysname-Ten-GigabitEthernet3/0/1] undo shutdown
[Sysname-Ten-GigabitEthernet3/0/1] quit
[Sysname] interface ten-gigabitethernet 3/0/2
[Sysname-Ten-GigabitEthernet3/0/2] shutdown
[Sysname-Ten-GigabitEthernet3/0/2] quit
[Sysname] irf-port 2
[Sysname-irf-port2] port group interface ten-gigabitethernet 3/0/2
[Sysname-irf-port2] quit
[Sysname] interface ten-gigabitethernet 3/0/2
[Sysname-Ten-GigabitEthernet3/0/2] undo shutdown
[Sysname-Ten-GigabitEthernet3/0/2] quit
# 配置Device A 的成员优先级为10，保证其在形成IRF 后能够被选举为Master。
[DeviceA] irf priority 10
# 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
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
Please wait...
Saving the converted configuration file to the main board succeeded.
Slot 1:
Saving the converted configuration file succeeded.
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 和2，并分别与物理端口Ten-GigabitEthernet2/0/1和Ten-GigabitEthernet2/0/2 绑定。
<Sysname> system-view
[Sysname] irf member 2
Info: Member ID change will take effect after the member reboots and operates in IRF mode.
[Sysname] interface ten-gigabitethernet 2/0/1
[Sysname-Ten-GigabitEthernet2/0/1] shutdown
[Sysname-Ten-GigabitEthernet2/0/1] quit
[Sysname] irf-port 1
[Sysname-irf-port1] port group interface ten-gigabitethernet 2/0/1
[Sysname-irf-port1] quit
[Sysname] interface ten-gigabitethernet 2/0/1
[Sysname-Ten-GigabitEthernet2/0/1] undo shutdown
[Sysname-Ten-GigabitEthernet2/0/1] quit
[Sysname] interface ten-gigabitethernet 2/0/2
[Sysname-Ten-GigabitEthernet2/0/2] shutdown
[Sysname-Ten-GigabitEthernet2/0/2] quit
[Sysname] irf-port 2
[Sysname-irf-port2] port group interface ten-gigabitethernet 2/0/2
[Sysname-irf-port2] quit
[Sysname] interface ten-gigabitethernet 2/0/2
[Sysname-Ten-GigabitEthernet2/0/2] undo shutdown
[Sysname-Ten-GigabitEthernet2/0/2] 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
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
Please wait...
Saving the converted configuration file to the main board succeeded.
Slot 1:
Saving the converted configuration file succeeded.
Now rebooting, please wait...
Device B 重启后与Device A 形成IRF。

(3) 配置Device C
# 配置Device C 的成员编号为3，创建IRF 端口1 和2，并分别与物理端口Ten-GigabitEthernet2/0/1和Ten-GigabitEthernet2/0/2 绑定。
<Sysname> system-view
[Sysname] irf member 3
Info: Member ID change will take effect after the member reboots and operates in IRF mode.
[Sysname] interface ten-gigabitethernet 2/0/1
[Sysname-Ten-GigabitEthernet2/0/1] shutdown
[Sysname-Ten-GigabitEthernet2/0/1] quit
[Sysname] irf-port 1
[Sysname-irf-port1] port group interface ten-gigabitethernet 2/0/1
[Sysname-irf-port1] quit
[Sysname] interface ten-gigabitethernet 2/0/1
[Sysname-Ten-GigabitEthernet2/0/1] undo shutdown
[Sysname-Ten-GigabitEthernet2/0/1] quit
[Sysname] interface ten-gigabitethernet 2/0/2
[Sysname-Ten-GigabitEthernet2/0/2] shutdown
[Sysname-Ten-GigabitEthernet2/0/2] quit
[Sysname] irf-port 2
[Sysname-irf-port2] port group interface ten-gigabitethernet 2/0/2
[Sysname-irf-port2] quit
[Sysname] interface ten-gigabitethernet 2/0/2
[Sysname-Ten-GigabitEthernet2/0/2] undo shutdown
[Sysname-Ten-GigabitEthernet2/0/2] 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
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
Please wait...
Saving the converted configuration file to the main board succeeded.
Slot 1:
Saving the converted configuration file succeeded.
Now rebooting, please wait...
Device C 重启后加入Device A 和B 形成的IRF。

(4) 配置Device D
# 配置Device D 的成员编号为4，创建IRF 端口1 和2，并分别与物理端口Ten-GigabitEthernet2/0/1和Ten-GigabitEthernet2/0/2 绑定。
<Sysname> system-view
[Sysname] irf member 4
Info: Member ID change will take effect after the member reboots and operates in IRF mode.
[Sysname] interface ten-gigabitethernet 2/0/1
[Sysname-Ten-GigabitEthernet2/0/1] shutdown
[Sysname-Ten-GigabitEthernet2/0/1] quit
[Sysname] irf-port 1
[Sysname-irf-port1] port group interface ten-gigabitethernet 2/0/1
[Sysname-irf-port1] quit
[Sysname] interface ten-gigabitethernet 2/0/1
[Sysname-Ten-GigabitEthernet2/0/1] undo shutdown
[Sysname-Ten-GigabitEthernet2/0/1] quit
[Sysname] interface ten-gigabitethernet 2/0/2
[Sysname-Ten-GigabitEthernet2/0/2] shutdown
[Sysname-Ten-GigabitEthernet2/0/2] quit
[Sysname] irf-port 2
[Sysname-irf-port2] port group interface ten-gigabitethernet 2/0/2
[Sysname-irf-port2] quit
[Sysname] interface ten-gigabitethernet 2/0/2
[Sysname-Ten-GigabitEthernet2/0/2] undo shutdown
[Sysname-Ten-GigabitEthernet2/0/2] 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
Device D 重启后与加入Device A、Device B 和Device C 组成的IRF，形成一个包含四台成员设备的IRF。

(5) 配置BFD MAD 检测
# 创建VLAN 3 ， 并将用于BFD MAD 检测的所有端口（ 包括GigabitEthernet1/2/0/1 、GigabitEthernet2/3/0/1、GigabitEthernet3/3/0/1 和GigabitEthernet4/3/0/1）加入VLAN 中。
<Sysname> system-view
[Sysname] vlan 3
[Sysname-vlan3] port gigabitethernet 1/2/0/1 gigabitethernet 2/3/0/1 gigabitethernet
3/3/0/1 gigabitethernet 4/3/0/1
[Sysname-vlan3] quit
# 创建VLAN 接口3，并配置MAD IP 地址。
[Sysname] interface vlan-interface 3
[Sysname-Vlan-interface3] mad bfd enable
[Sysname-Vlan-interface3] mad ip address 192.168.2.1 24 member 1
[Sysname-Vlan-interface3] mad ip address 192.168.2.2 24 member 2
[Sysname-Vlan-interface3] mad ip address 192.168.2.3 24 member 3
[Sysname-Vlan-interface3] mad ip address 192.168.2.4 24 member 4
[Sysname-Vlan-interface3] quit
# 因为BFD MAD 和生成树功能互斥，所以在用于BFD MAD 检测的端口上关闭生成树协议。
[Sysname] interface gigabitethernet 1/2/0/1
[Sysname-gigabitethernet-1/2/0/1] undo stp enable
[Sysname-gigabitethernet-1/2/0/1] quit
[Sysname] interface gigabitethernet 2/3/0/1
[Sysname-gigabitethernet-2/3/0/1] undo stp enable
[Sysname-gigabitethernet-2/3/0/1] quit
[Sysname] interface gigabitethernet 3/3/0/1
[Sysname-gigabitethernet-3/3/0/1] undo stp enable
[Sysname-gigabitethernet-3/3/0/1] quit
[Sysname] interface gigabitethernet 4/3/0/1
[Sysname-gigabitethernet-4/3/0/1] undo stp enable
[Sysname-gigabitethernet-4/3/0/1] quit

(6) 配置中间设备Device E
Device E 作为中间设备来透传BFD 协议报文，协助IRF 中的成员设备进行多Active 检测，因此只需要保证BFD MAD 检测链路上的所有端口都处于同一个VLAN 内即可，该VLAN 应为BFD MAD专用。

(7) BFD MAD 故障检测
由于使用的是环形连接，因此当一条 IRF 链路出现故障后，IRF 拓扑将变为链型，不会发生分裂。现在假设Device A 和Device B，以及Device C 和Device D 之间的链路均发生故障，IRF 将分裂为两个IRF，分别由Device A 和Device C（以下简称为IRF1），以及Device B 和Device D 组成（以下简称为IRF2）。系统将输出IRF 链路状态错误提示，以及单板失效提示，以IRF1 的输出信息为例。
%May 6 15:10:05:477 2010 H3C MAD/1/MAD_COLLISION_DETECTED: Multi-active devices detected, please fix it.
# 由于IRF2 的Master 设备编号较大，因此在MAD 冲突后将变为Recovery 状态，成员设备上除保留端口之外的端口都会处于关闭状态。
# 此时需要您修复IRF 链路，当IRF 链路修复后，系统会提示出现IRF 合并现象，需要重启IRF 系统。
%May 6 15:12:52:935 2010 H3C STM/6/STM_LINK_STATUS_UP:
IRF port 1 is up.
%May 6 15:13:02:828 2010 H3C STM/4/STM_MERGE_NEED_REBOOT:
IRF merge occurs and the IRF system needs a reboot.
# 您可以登录到DeviceB 或DeviceD 的Console 口，重启IRF2。
<Sysname> reboot
Start to check configuration with next startup configuration file, please wait.
.........DONE!
This command will reboot the device. Continue? [Y/N]:y
#May 6 15:31:09:724 2010 H3C DEVM/1/REBOOT:
Reboot device by command.
%May 6 15:31:09:734 2010 H3C DEVM/5/SYSTEM_REBOOT: System is rebooting now.
# 在启动完成后，IRF2 将加入IRF1，您可以通过display irf topology 命令显示IRF 拓扑信息。
<Sysname> display irf topology
Topology Info
-------------------------------------------------------------------------
IRF-Port1 IRF-Port2
MemberID Link neighbor Link neighbor Belong To
1 UP 3 UP 2 00e0-fc0f-8c0f
2 UP 1 UP 4 00e0-fc0f-8c0f
3 UP 4 UP 1 00e0-fc0f-8c0f
4 UP 2 UP 3 00e0-fc0f-8c0f

IRF-LACP mad 方式的配置举例参看：