It is generally not a recommended practice to go from a heavier beer to a lighter beer when using the yeast cake. The yeast can carry things over from the heavier beer into the lighter one. More commonly those beers would be done in the other order, although the heavy hop bill of the IPA may also tend to influence the flavor of a Porter put on the cake.
Primary: German Hef, Belgian IPA, Scottish 80, Belgian Dubbel
On Tap: Oatmeal Stout, Vanilla Oatmeal Stout, Belgian Dark Strong, Munich Dunkel, Dunkel Weizen, Oktoberfest, Bock, IPA, Black IPA, English IPA, Pale Ale
Using the mind to look for reality is delusion. Using your senses to look for reality is awareness.
"One time I was so desperate for a beer I snuck into the football stadium and ate the dirt under the bleachers." Homer Simpson
Life, Liberty, and the Pursuit of Hoppiness