I use my pointer finger to bar the top 3 strings and keep my ring finger planted on the 
D-string 11th fret.

e|-----------------------------9---------|
B|--------------10------9--------12------|
G|------9----9-----9------9--------------|
D|---11---11---------11-----11-----------|
A|---------------------------------------|
E|---------------------------------------|

e|--------------------------------------------|
B|--------------10------9-------10p9----------|
G|------9----9-----9------9---------11p9------|
D|---11---11---------11-----11----------------|
A|--------------------------------------------|
E|--------------------------------------------|

Repeat