一、组网需求:
网络中有一台SR6602路由器和两台S5120交换机对接。为了增加链路带宽,并实现链路冗余,将SR6602路由器的四个端口进行三层链路聚合,连接两台S5120交换机,在两台交换机上配置二层动态聚合组。 正常情况下SR6602路由器与交换机SW1进行以太网链路聚合对接,当SW1的两条链路断掉时,SR6602路由器会自动与交换机SW2进行以太网链路聚合。
设备及版本:SR6602路由器1台(版本为R3103P05)、S5120交换机2台(版本为2220P02)。
二、组网图:
三、配置步骤:
SR6602 配置 |
# interface Route-Aggregation 1 //创建一个路由聚合组,命名为1 link-aggregation mode dynamic // 将聚合组的工作方式设置为动态聚合 ip address 192.168.1.1 255.255.255.0 # lacp system-priority 1 //将SR6602路由器的系统LACP协议优先级改为1 # interface GigabitEthernet0/0 //将G0/0,G0/1,G0/2,G0/3加入聚合组中 port link-aggregation group 1 # interface GigabitEthernet0/1 port link-aggregation group 1 # interface GigabitEthernet0/2 port link-aggregation group 1 # interface GigabitEthernet0/3 port link-aggregation group 1 |
SW1 配置 |
# interface Bridge-Aggregation1 //创建二层聚合组,命名为1 link-aggregation mode dynamic //将聚合组的工作方式配置为动态聚合 # interface GigabitEthernet1/0/1 //将G1/0/1,G1/0/2加入到聚合组中 port link-aggregation group 1 # interface GigabitEthernet1/0/2 port link-aggregation group 1 |
SW2 配置 |
# interface Bridge-Aggregation1 //创建二层聚合组,命名为1 link-aggregation mode dynamic //将聚合组的工作方式配置为动态聚合 # interface GigabitEthernet1/0/3 //将G1/0/3,G1/0/4加入到聚合组中 port link-aggregation group 1 # interface GigabitEthernet1/0/4 port link-aggregation group 1 |
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四、功能测试:
1. 配置完成后,在SR6602路由器上使用display link-aggregation verbose命令查看链路聚合信息:
[H3C]dis link-aggregation v
Loadsharing Type: Shar -- Loadsharing, NonS -- Non-Loadsharing
Port Status: S -- Selected, U -- Unselected
Flags: A -- LACP_Activity, B -- LACP_Timeout, C -- Aggregation,
D -- Synchronization, E -- Collecting, F -- Distributing,
G -- Defaulted, H – Expired
Aggregation Interface: Route-Aggregation1
Aggregation Mode: Dynamic
Loadsharing Type: Shar
System ID: 0x1, 00e0-fc3a-0000
Local:
Port Status Priority Oper-Key Flag
-------------------------------------------------------------------------------
GE0/1 S 32768 1 {ACDEF}
GE0/2 U 32768 1 {AC}
GE0/3 U 32768 1 {AC}
GE0/0 S 32768 1 {ACDEF}
Remote:
Actor Partner Priority Oper-Key SystemID Flag
--------------------------------------------------------------------------------
GE0/1 1 32768 1 0x8000, 0023-893b-7085 {ACDEF}
GE0/2 6 32769 1 0x8000, 000f-e2b2-3417 {ACD}
GE0/3 5 32769 1 0x8000, 000f-e2b2-3417 {ACD}
GE0/0 2 32768 1 0x8000, 0023-893b-7085 {ACDEF}
由输出信息可知,SR6602路由器的G0/0与G0/1为选中端口与交换机SW1进行以太网链路聚合对接。
2. 当交换机SW1与SR6602路由器连接的两条链路断开时,SR6602路由器会自动与交换机SW2进行以太网链路聚合,这时查看链路聚合信息如下:
[H3C]dis link-aggregation v
Loadsharing Type: Shar -- Loadsharing, NonS -- Non-Loadsharing
Port Status: S -- Selected, U -- Unselected
Flags: A -- LACP_Activity, B -- LACP_Timeout, C -- Aggregation,
D -- Synchronization, E -- Collecting, F -- Distributing,
G -- Defaulted, H -- Expired
Aggregation Interface: Route-Aggregation1
Aggregation Mode: Dynamic
Loadsharing Type: Shar
System ID: 0x1, 00e0-fc3a-0000
Local:
Port Status Priority Oper-Key Flag
--------------------------------------------------------------------------------
GE0/1 U 32768 1 {AC}
GE0/2 S 32768 1 {ACDEF}
GE0/3 S 32768 1 {ACDEF}
GE0/0 U 32768 1 {AC}
Remote:
Actor Partner Priority Oper-Key SystemID Flag
--------------------------------------------------------------------------------
GE0/1 1 32768 1 0x8000, 0023-893b-7085 {ACEF}
GE0/2 6 32769 1 0x8000, 000f-e2b2-3417 {ACDEF}
GE0/3 5 32769 1 0x8000, 000f-e2b2-3417 {ACDEF}
GE0/0 2 32768 1 0x8000, 0023-893b-7085 {ACEF}
由输出信息可以看出SR6602路由器已自动切换与交换机SW2进行以太网链路聚合。
3. 当交换机SW1 的两条链路恢复时,SR6602路由器也将会自动切换回交换机SW1进行链路聚合。查看链路聚合信息如下:
[H3C]dis link-aggregation v
Loadsharing Type: Shar -- Loadsharing, NonS -- Non-Loadsharing
Port Status: S -- Selected, U -- Unselected
Flags: A -- LACP_Activity, B -- LACP_Timeout, C -- Aggregation,
D -- Synchronization, E -- Collecting, F -- Distributing,
G -- Defaulted, H – Expired
Aggregation Interface: Route-Aggregation1
Aggregation Mode: Dynamic
Loadsharing Type: Shar
System ID: 0x1, 00e0-fc3a-0000
Local:
Port Status Priority Oper-Key Flag
-------------------------------------------------------------------------------
GE0/1 S 32768 1 {ACDEF}
GE0/2 U 32768 1 {AC}
GE0/3 U 32768 1 {AC}
GE0/0 S 32768 1 {ACDEF}
Remote:
Actor Partner Priority Oper-Key SystemID Flag
--------------------------------------------------------------------------------
GE0/1 1 32768 1 0x8000, 0023-893b-7085 {ACDEF}
GE0/2 6 32769 1 0x8000, 000f-e2b2-3417 {ACD}
GE0/3 5 32769 1 0x8000, 000f-e2b2-3417 {ACD}
GE0/0 2 32768 1 0x8000, 0023-893b-7085 {ACDEF}
五、配置关键点:
1. SR6602路由器侧聚合链路设备ID(系统LACP优先级+系统MAC)应该最小(数值越低,优先级越高)。动态链路聚合时,本端系统和对端系统会进行协商,根据优先级高的一端的设备的端口ID大小来决定两端端口的状态,SR6602路由器优先级高,则可在SR6602路由器端通过修改端口优先级控制端口状态。 修改系统LACP优先级可在系统视图下使用lacp system-priority命令。
2. 应该保证G0/0与G0/1端口的聚合优先级数值低于G0/2与G0/3端口的聚合优先级(数值越低,优先级越高),修改端口聚合优先级可在端口视图下使用link-aggregation port-priority命令。
默认情况下,系统会选择端口ID(端口ID=端口的LACP协议优先级+端口号)较小的端口作为参考端口,端口优先级默认为32768,所以优先级相同时端口号小的为参考端口。与参考端口属性配置和第二类配置一致且处于UP状态的端口,并且该端口的对端端口与参考端口的对端端口的配置也一致时,该端口才可能成为Selected状态。故在本案例中G0/0为参考端口,G0/1和G0/1的对端设备的配置与G0/0和其对端设备的配置一致,所以G0/0与G0/1为Selected端口。
3. 本案例交换机位置也适用于防火墙。
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