Forcing forehand. Off the pull, the zone sets up with the disc in the middle of the field. With a forehand force, we are trapping to the forehand sideline. D1 sets up on the mark forcing forehand. D1 should play ~1 yard off to really prevent any throws to the break side. D2 plays close to D1's left side to cut off the IO break. D3 sets up in front of the thrower. D4 should be talking to D3 and either playing in the D2-D3 gap or playing to D3's left on the force side. The goal here is to take away only one half of the field and make it very easy and tempting to throw to the trap sideline.
If the disc is broken to the breakside, D1 stays on the mark and the defense remains mostly the same. D1 can play more of an Ice mark and the rest of the cup adjusts accordingly.
As the disc is swung across the field, the cup must move as a unit to try to prevent any large gaps from opening up.
When the disc is swung to the trap sideline (~5 yards or closer), D3 can make the call to set the trap. D3 then becomes the mark, keeping the forehand force. D3 can set up anywhere from directly facing the sideline (90 degrees) to more of a no-dump mark (45 degrees). D3 should play a bit off and really focus on taking away the around break. THERE SHOULD BE SOMEONE ON THE SIDELINE TO HELP POSITION D3. D2 plays on D3's left hip and takes away the IO break throw. D1 guards the dump. In this case, O2 is the closest and D1 would guard him, preventing an easy throw back to the middle. When guarding the dump, D1 should guard them cutting back, and force them to go upline. D4 now joins the cup and plays to D2's left side, taking away throws back to the middle of the field. D6 guards the sideline and takes away any throws down the sideline. D7 should pinch towards the trapside. D5 pinches in towards the middle of the field to guard O4/O5 and watches for hammers. In poor weather conditions, the set trap is very difficult to break.
The easiest way to break the trap is a hammer to O6 or O1. In windy/rainy conditions, this has a questionable success rate. If the trap has been set, there are a few offensive moves that can be made. O2 can cut back to try to get the dump, while O1 comes in closer to make an easier break throw. D1 should be guarding O2 and be preventing that dump backwards. O1 should aim for either the D3-D2 gap, or also go back to give O3 the around break throw. O1 and O2 are then essentially splitting D1. As O1 is coming in for the dump, someone on the sideline should be telling D3 how to position themselves, and the cup adjusts depending on how D3 is positioned. One of the poppers/wings can also come back and fill the D3-D2 gap. If D5 pinches down on them, then it opens up the middle of the field.
If O2 fails to receive the dump on a cut back, O2 can cut upline to draw D1 away and crash into the cup. This allows O1 to fill in behind O3 for an easy dump. D1 should release O2 as O2 cuts upline, and then guard O1 as O1 becomes the bigger dump threat.
Aside from O2 crashing, one of the wings/poppers such as O5 can crash as well. If the disc goes to someone on a crash, the trap can stay the same, although D1 has to identify the closest dump to guard.
It's okay to dump far back or almost directly backwards if the handler can then make a quick swing away from the sideline.
If the disc is swung away from the sideline, the trap is off and the defense resets.
Of course, the easiest way to play against a trap zone defense is simply to never allow them a chance to set the zone. One set involves the trapside handler, O3, setting up a little back of O2.
If the cup is a bit loose, O3 can crash directly into the cup for an easy reset to keep the disc in the middle of the field.
If the cup is playing tight...
O2 can cut back for a taco cut to create an open break throw to O1 or a wing.
You can also beat the trap through quick movement. If O3 can take advantage of being open and set up upfield, they can get a throw off before the trap is set.
When the pass is made, O3 should look to make a throw to the cutters back to the middle of the field.
If O3 can make the pass to O4 or O5, then open continue throws can be made to the other cutters/wings.
If the disc breaks through the cup, the downfield defenders, D4-D7 should focus on picking up cutters, and should not mark the disc. The cup should try to catch up to the disc.
If it looks like the defense is breaking down, D7 can call for a switch to a man defense, in which case everyone should find the most dangerous unguarded player. Communication is key. People need to be pointing and shouting so everyone knows who they have. From there, play regular man defense, keeping the original force.