三层链路聚合：

[SWB]interface Route-Aggregation 1

[SWB-Bridge-Aggregation1]exit

[SWB]interface range G 1/0/21 to G 1/0/23

[SWB-if-range]port link-mode route

[SWB-if-range]port link-aggregation group 1

[SWB-if-range]exit

[SWB]interface route-Aggregation 1

[SWB-route-Aggregation1]ip address 192.168.1.1 24

[SWB-route-Aggregation1]undo shutdown