1、组网需求
四台服务器1、2、3、4做好端口聚合，并接入堆叠交换机，堆叠交换机再连接外网核心交换机聚合端口。服务器都配置属于vlan 83，接入交换机与核心交换机端口都配置Trunk口，核心和接入都通过聚合组18互联。
2、组网图
3、具体配置
1）接入交换机配置：
//创建链路聚合接口
interface Bridge-Aggregation1
port access vlan 83
#
interface Bridge-Aggregation2
port access vlan 83
#
interface Bridge-Aggregation3
port access vlan 83
#
interface Bridge-Aggregation4
port access vlan 83
#
interface Bridge-Aggregation18 //连接核心交换机
description To IDC-W-37
port link-type trunk
undo port trunk permit vlan 1
port trunk permit vlan 2 to 4094
//将端口加入到聚合组1
interface GigabitEthernet1/0/1
port access vlan 83
port link-aggregation group 1
#
interface GigabitEthernet2/0/1
port access vlan 83
port link-aggregation group 1
//将端口加入到聚合组2
interface GigabitEthernet1/0/2
port access vlan 83
port link-aggregation group 2
#
interface GigabitEthernet2/0/2
port access vlan 83
port link-aggregation group 2
//将端口加入到聚合组3
interface GigabitEthernet1/0/3
description A17 6-7U 83.4
port access vlan 83
port link-aggregation group 3
#
interface GigabitEthernet2/0/3
port access vlan 83
port link-aggregation group 3
//将端口加入到聚合组4
interface GigabitEthernet1/0/4
port access vlan 83
port link-aggregation group 4
#
interface GigabitEthernet2/0/4
port access vlan 83
port link-aggregation group 4
#
//将端口加入到聚合组18
interface GigabitEthernet1/0/49
description To 1#1-IDC-W 37
port link-type trunk
undo port trunk permit vlan 1
port trunk permit vlan 2 to 4094
port link-aggregation group 18
#
interface GigabitEthernet2/0/49
description To 1#1-IDC-W 38
port link-type trunk
undo port trunk permit vlan 1
port trunk permit vlan 2 to 4094
port link-aggregation group 18
2）核心交换机配置：
//创建链路聚合接口18
interface Bridge-Aggregation18
description To A15 Industrial safety sw
port link-type trunk
undo port trunk permit vlan 1
port trunk permit vlan 2 to 4094
//将端口加入到聚合组18中
interface GigabitEthernet4/0/37
port link-mode bridge
description To IDC-A15-3-W 49
port link-type trunk
undo port trunk permit vlan 1
port trunk permit vlan 2 to 4094
port link-aggregation group 18
#
interface GigabitEthernet4/0/38
port link-mode bridge
description To IDC-A15-3-W 49
port link-type trunk
undo port trunk permit vlan 1
port trunk permit vlan 2 to 4094
port link-aggregation group 18
#
疑问：接入交换机与核心交换机的链路聚合接口是否必须一样？能不能一个是5另外一个是18？