Example l2 doesn't work

[3d0c]

Hello. Faced strange problem — it doesn't work by default. As i could find, the problem is in core.go ConnectionUp method in dscFmod

    dscFmod := ofp10.NewFlowMod()
    dscFmod.Priority = 0xffff
    dscFmod.Match.DLType = 0xa0f1 // Link Discovery Messages
    dscFmod.AddAction(ofp10.NewActionOutput(ofp10.P_CONTROLLER))

If you disable this mod, everything will work as expected. Why so? This mod brings controllers very strange behavior, and causes the l2 example doesn't work.