Let's start with Austria, because that part of the story is way more interesting.
The first question might be: Did Bismarck want to integrate Austria into Germany?
The answer is yeah, probably, but only up until 1866.
Some background: the dream of a unified Germany had been the objective of pretty much every German politician for all of the 19th century, because of a strong sense of romantic German nationalism. There were a bunch of Pan-Germanist philosophers and politicians, which led to a shaky--but economically effective---confederation between German-speaking states.
This Confederation pretty much prevented any kind of integration or meditization of Austria into Prussia from the Congress of Vienna (1815) onward.
But, the Austrians and the Prussians had a massive rivalry and had since the middle of the previous century. They had a lot of things to fight over, but the main thing became a tiny piece of land which adjacent to modern-day Denmark: Schleswig-Holstein. In 1864, Austria and Prussia teamed up in the Second Schleswig War to capture this land and the people (many of whom spoke German). They won handily and the next year signed the Gastein Convention to divide up the spoils. Bismarck, being a skilled negotiator, made it seem like Austria was getting the lion's share of the deal.
This agreement didn't really smooth things over. First of all, it was just between Prussia and Austria. There were a dozen other states in the Confederation that were supposed to get a vote in these things! Second, it pissed off the British (who felt this was giving German access to waters they had controlled) and the French (who saw this as more German aggression in the area) and pleased the Russians (who hated the Austrians and probably saw Bismarck as fooling them.) And third, the agreement followed a war in which the Prussians and the Austrians got to check out each other's military prowess.
The Prussians are annoyed about the the administration of Schleswig-Holstein so they try to convene a meeting, Bismarck is like "well, I guess we aren't a big German Confederation any more if you're doing this on your own" and boom, we have the Austrian-Prussian war.
Which is over in seven weeks, because Prussia has the greatest military strategist of the era Helmuth von Moltke the Elder, because Bismarck had made a deal with Italy to enter the war and divide Austria's forces, and because Bismarck had already set up alliances all over Europe to prevent anybody else from getting involved right away.
But, it's not like that was going to last forever. France or Russia or even England would have gotten involved, because a single unified Germanic state stretching from the North Sea to the Adriatic would be way too powerful. Austria ended up having to sign the Peace of Prague in 1866, which kept them out of the German confederation permanently. And the following year they teamed up with Hungary, which sealed the deal. No Austria in Germany until the 20th century.
What about Switzerland? The answer is pretty boring. The Swiss were recognized as permanently neutral by the Congress of Vienna. This was done not so much because they didn't want to choose sides, but because everybody seemed to agree they needed a buffer zone between France and Austria. Bismarck knew this and never tried to bring them in.
Sources:
The Seven Weeks' War: the Austro-Prussian Conflict of 1866, H. M. Hozier
Iron Kingdom: The Rise and Downfall of Prussia, 1600-1947, Christopher Clark