I just brought in a 3560 switch that has 12.2(25)SEB2 installed. Looking at the Cisco site I see that 12.2(25)SEC2 and 12.2(25)SEB4 are also available. It appears as though I am already running the latest release, but I am just curious what the SEC and SEB designations are for. I tried to find this on the Cisco site but I must not be looking in the right place.