I have connectivity issue on my network. When I look on netsight I have seen "oversized" packets in increase. Is this will cause to slow ? Any idea why these oversized packets comming. Also, I wil try jumbo frames on those ports.
You should probably do some packet captures to figure out what the traffic is before starting to change settings. Setting jumbo frames on a "port" isn't going to fix anything, especially if you don't know what the traffic is.
If there are over sized packets the switch can do one of two things: It will either drop it or send back a request that the packet be fragmented. As Jeremy mentioned enabling jumbo frames will not help unless you know what traffic bis being considered over sized, especially if you do no enable jumble jumbo frames through the entire path the traffic is traveling.