Help with Link Aggregation

[yahyaa.bham]

need some help getting this going..

I have 2 SG500 switches in L3 mode, stacked, that will act as my main router.

I then have several SG500 switches in L2 mode dotted around the business.

I'm looking to cable 2 ports from each of the L3 switches to the L2 switches for redundancy.

How would i go about setting this up? I have set the vlans on the L3, set up GVRP on both L3 and L2, put the 2 ports on the L3 in lag 1.

[Reza Sharifi]

Have never used the SG series before but if they are like any other Cisco switches, they should support Portchannel or EtherChannel for aggregating multiple physical links using LACP/PAGP or mode on. 

HTH