3Com Switch 7700 Configuration Manual page 51

Configuring Link Aggregation 43
[SW7700-Ethernet1/0/1] interface ethernet1/0/2
[SW7700-Ethernet1/0/2] port link-aggregation group 1
[SW7700-Ethernet1/0/2] interface ethernet1/0/3
[SW7700-Ethernet1/0/3] port link-aggregation group 1
3 Configure a dynamic LACP aggregation
Enable LACP at Ethernet ports Ethernet1/0/1 to Ethernet1/0/3.
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[SW7700] interface ethernet1/0/1
[SW7700-Ethernet1/0/1] lacp enable
[SW7700-Ethernet1/0/1] interface ethernet1/0/2
[SW7700-Ethernet1/0/2] lacp enable
[SW7700-Ethernet1/0/2] interface ethernet1/0/3
[SW7700-Ethernet1/0/3] lacp enable
Only when the three ports are configured with identical basic configuration, rate
and duplex mode, can they be added into a same dynamic aggregation group
after LACP is enabled on them, for load sharing.