在最上面的交换机
interface Bridge-aggregation 1
quit
interface range gi 1/0/46 to gi 1/0/48
port link-mode bridge
port link-aggregation group 1
quit
interface Bridge-Aggregation 1
port link-type trunk
port trunk permit vlan all
原文：https://www.cnblogs.com/zx99/p/11940738.html