diff --git a/src/autorouter/multilayer_autoroute.rs b/src/autorouter/multilayer_autoroute.rs
index fba4534..e93d280 100644
--- a/src/autorouter/multilayer_autoroute.rs
+++ b/src/autorouter/multilayer_autoroute.rs
@@ -56,7 +56,7 @@ impl MultilayerAutorouteExecutionStepper {
                 autorouter,
                 PlanarAutoroutePreconfigurerInput {
                     terminating_dot_map,
-                    ..configuration.planar
+                    ratlines: configuration.planar.ratlines,
                 },
                 options.planar,
             )?,
@@ -96,20 +96,20 @@ impl<M: AccessMesadata> Abort<Autorouter<M>> for MultilayerAutorouteExecutionSte
 }
 
 impl<M: AccessMesadata> Reconfigure<Autorouter<M>> for MultilayerAutorouteExecutionStepper {
-    type Configuration = AnterouterPlan;
+    type Configuration = MultilayerAutorouteConfiguration;
     type Output = Result<(), AutorouterError>;
 
     fn reconfigure(
         &mut self,
         autorouter: &mut Autorouter<M>,
-        plan: AnterouterPlan,
+        new_configuration: MultilayerAutorouteConfiguration,
     ) -> Result<(), AutorouterError> {
         self.planar.abort(autorouter);
+
+        // FIXME: this somehow corrupts internal state.
         autorouter.board.apply_edit(&self.anteroute_edit.reverse());
 
-        let mut anterouter = Anterouter::new(plan);
-        let mut anteroute_edit = BoardEdit::new();
-        anterouter.anteroute(autorouter, &mut anteroute_edit, &self.options.anterouter);
+        *self = Self::new(autorouter, new_configuration, self.options)?;
         Ok(())
     }
 }
diff --git a/src/autorouter/multilayer_reconfigurator.rs b/src/autorouter/multilayer_reconfigurator.rs
index 2bbfc75..15c17c2 100644
--- a/src/autorouter/multilayer_reconfigurator.rs
+++ b/src/autorouter/multilayer_reconfigurator.rs
@@ -45,6 +45,7 @@ impl MultilayerAutorouteReconfigurator {
         options: MultilayerAutorouteOptions,
     ) -> Result<Self, AutorouterError> {
         let preconfigurer = MultilayerPreconfigurer::new(autorouter, input.clone());
+
         let preconfiguration = MultilayerAutorouteConfiguration {
             plan: preconfigurer.plan().clone(),
             planar: PlanarAutoroutePreconfigurerInput {
@@ -52,7 +53,8 @@ impl MultilayerAutorouteReconfigurator {
                 terminating_dot_map: BTreeMap::new(),
             },
         };
-        let reconfigurer = MultilayerReconfigurer::new(autorouter, input.ratlines, &options);
+        let reconfigurer =
+            MultilayerReconfigurer::new(autorouter, preconfiguration.clone(), &options);
 
         Ok(Self {
             stepper: MultilayerAutorouteExecutionStepper::new(
@@ -72,11 +74,11 @@ impl MultilayerAutorouteReconfigurator {
     ) -> Result<ControlFlow<Option<BoardEdit>, MultilayerReconfiguratorStatus>, AutorouterError>
     {
         loop {
-            let Some(plan) = self.reconfigurer.next_configuration(autorouter) else {
+            let Some(configuration) = self.reconfigurer.next_configuration(autorouter) else {
                 return Ok(ControlFlow::Break(None));
             };
 
-            match self.stepper.reconfigure(autorouter, plan) {
+            match self.stepper.reconfigure(autorouter, configuration) {
                 Ok(_) => {
                     return Ok(ControlFlow::Continue(
                         ReconfiguratorStatus::Reconfigured(()),
diff --git a/src/autorouter/multilayer_reconfigurer.rs b/src/autorouter/multilayer_reconfigurer.rs
index 8f17fed..9a9eff7 100644
--- a/src/autorouter/multilayer_reconfigurer.rs
+++ b/src/autorouter/multilayer_reconfigurer.rs
@@ -2,45 +2,51 @@
 //
 // SPDX-License-Identifier: MIT
 
-use std::{collections::BTreeSet, time::SystemTime};
+use std::{collections::BTreeMap, time::SystemTime};
 
 use specctra_core::mesadata::AccessMesadata;
 
 use crate::autorouter::{
-    anterouter::AnterouterPlan, multilayer_autoroute::MultilayerAutorouteOptions,
-    multilayer_preconfigurer::MultilayerPreconfigurer, ratline::RatlineUid, Autorouter,
+    multilayer_autoroute::{MultilayerAutorouteConfiguration, MultilayerAutorouteOptions},
+    planar_preconfigurer::PlanarAutoroutePreconfigurerInput,
+    Autorouter,
 };
 
 pub struct MultilayerReconfigurer {
-    original_ratlines: BTreeSet<RatlineUid>,
+    preconfiguration: MultilayerAutorouteConfiguration,
 }
 
 impl MultilayerReconfigurer {
     pub fn new(
-        autorouter: &Autorouter<impl AccessMesadata>,
-        ratlines: BTreeSet<RatlineUid>,
-        options: &MultilayerAutorouteOptions,
+        _autorouter: &Autorouter<impl AccessMesadata>,
+        preconfiguration: MultilayerAutorouteConfiguration,
+        _options: &MultilayerAutorouteOptions,
     ) -> Self {
-        Self {
-            original_ratlines: ratlines,
-        }
+        Self { preconfiguration }
     }
 
     pub fn next_configuration(
         &mut self,
-        autorouter: &Autorouter<impl AccessMesadata>,
-    ) -> Option<AnterouterPlan> {
-        let planner = MultilayerPreconfigurer::new_from_layer_map(
-            autorouter,
-            &self.original_ratlines,
-            self.original_ratlines
-                .iter()
-                .enumerate()
-                .map(|(_, ratline)| (*ratline, Self::crude_random_bit()))
-                .collect(),
-        );
+        _autorouter: &Autorouter<impl AccessMesadata>,
+    ) -> Option<MultilayerAutorouteConfiguration> {
+        let mut new_anterouter_plan = self.preconfiguration.plan.clone();
+        new_anterouter_plan.layer_map = self
+            .preconfiguration
+            .planar
+            .ratlines
+            .iter()
+            .enumerate()
+            //.map(|(i, ratline)| (*ratline, i % 2))
+            .map(|(_, ratline)| (*ratline, Self::crude_random_bit()))
+            .collect();
 
-        Some(planner.plan().clone())
+        Some(MultilayerAutorouteConfiguration {
+            plan: new_anterouter_plan,
+            planar: PlanarAutoroutePreconfigurerInput {
+                ratlines: self.preconfiguration.planar.ratlines.clone(),
+                terminating_dot_map: BTreeMap::new(),
+            },
+        })
     }
 
     fn crude_random_bit() -> usize {
diff --git a/src/bimapset.rs b/src/bimapset.rs
index 25a3693..6d70b2d 100644
--- a/src/bimapset.rs
+++ b/src/bimapset.rs
@@ -83,16 +83,16 @@ impl<K: Eq + Ord + Clone, V: Eq + Ord + Clone> BiBTreeMapSet<K, V> {
     /// Removes a value from the reverse map and the key from the forward map if
     /// it no longer has any values.
     pub fn remove_by_value(&mut self, value: &V) -> Option<K> {
-        if let Some(k) = self.value_to_key.remove(value) {
+        if let Some(key) = self.value_to_key.remove(value) {
             // Remove the value from the key's value set.
-            if let Some(set) = self.key_to_values.get_mut(&k) {
+            if let Some(set) = self.key_to_values.get_mut(&key) {
                 set.remove(value);
                 // Remove the key if it no longer has any values.
                 if set.is_empty() {
-                    self.key_to_values.remove(&k);
+                    self.key_to_values.remove(&key);
                 }
             }
-            Some(k)
+            Some(key)
         } else {
             None
         }