Right now I have 1841 with an IP BASE IOS, major release 12.4, release number 12.4(1c)
Now if I want to upgrade the IOS to the 'Advanced IP Services' feature set, do I need to get the one for 12.4(1c) and only that one?
Because I do not see the Advanced IP Services IOS in that version.
Is there anything stopping me from getting, say, the 12.4(19b) release? I am just confused on all these release numbers, what they mean, and how they determine what I can and can't get.