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7750 link aggregation problem

Aigor
Occasional Visitor

7750 link aggregation problem

Hi, i buy one 7750 with one 3c16886 and two of 3c168916 12 port copper and 4 port fiber , i would like set up 4 lacp link with other's 3com device, when write some commad i can see lacp active but one for any link with other device.



My setup would be like this



Two 5500 stacked with special cable, one fiber interface from for example  interface 1/0/25 ( first fiber of firts switch on stack ) to one fiber , for example 2/0/13 of 7750, another link from interface 2/0/25 of 5500 stack unit 2 to interface 3/0/13 of the 7750



all interface are configured in the same way as read manual, same trunk type, same vlan-pass same pvid and so on.



When try to do this i can see lacp enable and relative group but i see 4 distinct group, insted 2 group with in the two interface from two blades.



As you can knows it's possible establish lacp link shared across blades?



Many thanks



2 REPLIES
Fred_Mancen_1
Super Advisor

Re: 7750 link aggregation problem

The 7750 switch does not support distributed link aggregation; in exception the 7758 when using redundant fabric modules, when the switch will support the distribution of aggregated links only in the ports available in these fabric modules.



HTH



Aigor
Occasional Visitor

Re: 7750 link aggregation problem

Many Thanks for answer, my workaround was using two fiber on the same blade in lacp link