This tab illustrates how to play 11th's on the bass.
11th's are simply 4th's an octave up.

example)

 |Root    4th     |Root    11th    |
 |Ab      Db      |Ab      Db      | 
G|————————————————|————————6———————|
D|————————————————|————————————————|
A|————————4———————|————————————————|
E|4———————————————|4———————————————|
 |1 + 2 + 3 + 4 + |1 + 2 + 3 + 4 + |

Notice how the 4th and the 11th are the same note.

There are two types of fourths in western music,
there is the perfect 4th (4) — 5 half steps (frets) away from the root.
and the sharp 4th (#4) — 6 half steps (frets) away from the root.
in this respect, that means there are two types of 11th's
The perfect 11th (11) and the sharp 11th (#11)

*if none of this is making sense, check out my intervals tab.*

11th's have a suspended sound meaning it has an open sound that wants to resolve.
it does not define if the chord is major or minor. (that's what the 3rd does)

—A Perfect 4th (4) or 11th (11) likes to resolve to a major or minor 3rd or 10th:
 (you can resolve up to the 5th (12th) but the resolution is not as strong)

example)

(the bass note is a C, the note above the tab is the 11th and 10th)

 |11th (F)        |major 10th (E)  |11th (F)        |minor 10th (Eb) |
G|10——————————————|9———————————————|10——————————————|8———————————————|
D|————————————————|————————————————|————————————————|————————————————|
A|————————————————|————————————————|————————————————|————————————————|
E|8———————————————|8———————————————|8———————————————|8———————————————|
 |1 + 2 + 3 + 4 + |1 + 2 + 3 + 4 + |1 + 2 + 3 + 4 + |1 + 2 + 3 + 4 + |

—A Sharp 4th (#4) or sharp #11th (#11) likes to resolve to the 5th or 12th.
 (you can resolve down to the 3rd (10th) but the resolution is not as strong)

example)

(the bass note is a C, the note above the tab is the #11th and 12th)

 |#11th (F#)      |12th (G)        |
G|11——————————————|12——————————————|
D|————————————————|————————————————|
A|————————————————|————————————————|
E|8———————————————|8———————————————|
 |1 + 2 + 3 + 4 + |1 + 2 + 3 + 4 + |

Here's a little progression that will help you move these intervals around:
I will label the chord, intervals and notes so you can get an idea of whats going on.

R=Root of the chord

  |D major                         |E minor                         |
  |R       10  R   11  10  R       |R       11 b10 b10 11   R       |
  |D       F#  D   G   F#  D       |E       A   G   G  A    E       |
G||————————11——————12——11——————————|————————14p—12——12h14———————————|
D|o————————————————————————————————|————————————————————————————————|
A|o————————————————————————————————|————————————————————————————————|
E||10——————————10——————————10————//|12——————————————————————12————//|
  |1 e + a 2 e + a 3 e + a 4 e + a |1 e + a 2 e + a 3 e + a 4 e + a |

 |G major                         |G major                         |
 |R       10  R #11   R   12      |R       10  R #11   R   12      |
 |G       B  G   C#   G   D       |G       B  G   C#   G   D       |
G|————————16—————18———————19——————|————————16——————18——————19//////||
D|————————————————————————————————|————————————————————————————————o|
A|————————————————————————————————|————————————————————————————————o|
E|15——————————15——————15——————————|15——————————15——————15——————————||
 |1 e + a 2 e + a 3 e + a 4 e + a |1 e + a 2 e + a 3 e + a 4 e + a |

I encourage you to come up with your own songs using these intervals.

i hope this has been helpful.
message me for questions.
thanks,

—Just3boyz