hi, havent noticed any issues with having DHCP snooping enabled - performance wise the access layer seemed to be the same with or without it (its very quick and easy for these switches to see particular bits of packets). just ensure that your trunks are trusted (we too do the whole vlan range rather than only particular ones that a switch may actually handle - makes deployment easier and stops nasty gotchas like an edge port being put onto a vlan that has no snooping protection because the person who added it didnt then update the switch config...)
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