diff --git a/python/sglang/srt/disaggregation/decode.py b/python/sglang/srt/disaggregation/decode.py
index 699de552416..fb0fef46485 100644
--- a/python/sglang/srt/disaggregation/decode.py
+++ b/python/sglang/srt/disaggregation/decode.py
@@ -28,13 +28,7 @@
 import torch
 from torch.distributed import ProcessGroup
 
-from sglang.srt.disaggregation.base import (
-    BaseKVManager,
-    BaseKVReceiver,
-    BaseKVSender,
-    KVArgs,
-    KVPoll,
-)
+from sglang.srt.disaggregation.base import BaseKVManager, BaseKVReceiver, KVArgs, KVPoll
 from sglang.srt.disaggregation.utils import (
     DisaggregationMode,
     KVClassType,
diff --git a/python/sglang/srt/disaggregation/mooncake/conn.py b/python/sglang/srt/disaggregation/mooncake/conn.py
index 062d43a5969..67159784d82 100644
--- a/python/sglang/srt/disaggregation/mooncake/conn.py
+++ b/python/sglang/srt/disaggregation/mooncake/conn.py
@@ -329,7 +329,7 @@ def _register_to_bootstrap(self):
             "role": "Prefill",
             "rank_ip": get_local_ip_by_remote(),
             "rank_port": self.rank_port,
-            "bootstrap_key": f"{bootstrap_server_url}_{self.kv_args.engine_rank}",
+            "engine_rank": self.kv_args.engine_rank,
         }
 
         try:
@@ -400,28 +400,29 @@ def __init__(
         self.session_id = self.kv_mgr.get_session_id()
         self.kv_mgr.update_status(bootstrap_room, KVPoll.Bootstrapping)
 
-        self.bootstrap_key = f"{self.bootstrap_addr}_{self.kv_mgr.kv_args.engine_rank}"
+        # NOTE: key distinguished by bootstrap_addr and engine_rank
+        bootstrap_key = f"{self.bootstrap_addr}_{self.kv_mgr.kv_args.engine_rank}"
 
-        if self.bootstrap_key not in self.kv_mgr.connection_pool:
+        if bootstrap_key not in self.kv_mgr.connection_pool:
             self.bootstrap_info = self._get_bootstrap_info_from_server(
-                self.bootstrap_key
+                self.kv_mgr.kv_args.engine_rank
             )
             if self.bootstrap_info is None:
                 logger.error(
                     f"Could not fetch bootstrap info for engine rank: {self.kv_mgr.kv_args.engine_rank}"
                 )
             else:
-                self.kv_mgr.connection_pool[self.bootstrap_key] = self.bootstrap_info
+                self.kv_mgr.connection_pool[bootstrap_key] = self.bootstrap_info
         else:
-            self.bootstrap_info = self.kv_mgr.connection_pool[self.bootstrap_key]
+            self.bootstrap_info = self.kv_mgr.connection_pool[bootstrap_key]
 
         assert self.bootstrap_info is not None
         self.kv_mgr.update_status(bootstrap_room, KVPoll.WaitingForInput)
 
-    def _get_bootstrap_info_from_server(self, bootstrap_key: str):
+    def _get_bootstrap_info_from_server(self, engine_rank):
         """Fetch the bootstrap info from the bootstrap server."""
         try:
-            url = f"http://{self.bootstrap_addr}/route?bootstrap_key={bootstrap_key}"
+            url = f"http://{self.bootstrap_addr}/route?engine_rank={engine_rank}"
             response = requests.get(url)
             if response.status_code == 200:
                 bootstrap_info = response.json()
@@ -556,28 +557,28 @@ async def _handle_route_put(self, request: web.Request):
         role = data["role"]
         rank_ip = data["rank_ip"]
         rank_port = int(data["rank_port"])
-        bootstrap_key = data["bootstrap_key"]
+        engine_rank = int(data["engine_rank"])
 
         # Add lock to make sure thread-safe
         if role == "Prefill":
-            self.prefill_port_table[bootstrap_key] = {
+            self.prefill_port_table[engine_rank] = {
                 "rank_ip": rank_ip,
                 "rank_port": rank_port,
             }
             logger.debug(
-                f"Registered Prefill bootstrap_key: {bootstrap_key} with rank_ip: {rank_ip} and rank_port: {rank_port}"
+                f"Registered Prefill boostrap: {engine_rank} with rank_ip: {rank_ip} and rank_port: {rank_port}"
             )
 
         return web.Response(text="OK", status=200)
 
     async def _handle_route_get(self, request: web.Request):
-        bootstrap_key = request.query.get("bootstrap_key")
-        if not bootstrap_key:
-            return web.Response(text="Missing bootstrap_key", status=400)
+        engine_rank = request.query.get("engine_rank")
+        if not engine_rank:
+            return web.Response(text="Missing rank", status=400)
 
         # Find corresponding prefill info
         async with self.lock:
-            bootstrap_info = self.prefill_port_table.get(bootstrap_key)
+            bootstrap_info = self.prefill_port_table.get(int(engine_rank))
 
         if bootstrap_info is not None:
             return web.json_response(bootstrap_info, status=200)
diff --git a/python/sglang/srt/disaggregation/prefill.py b/python/sglang/srt/disaggregation/prefill.py
index 408402c4f83..7ad548ccc3d 100644
--- a/python/sglang/srt/disaggregation/prefill.py
+++ b/python/sglang/srt/disaggregation/prefill.py
@@ -24,13 +24,7 @@
 
 import torch
 
-from sglang.srt.disaggregation.base import (
-    BaseKVManager,
-    BaseKVReceiver,
-    BaseKVSender,
-    KVArgs,
-    KVPoll,
-)
+from sglang.srt.disaggregation.base import BaseKVManager, KVArgs, KVPoll
 from sglang.srt.disaggregation.utils import (
     DisaggregationMode,
     KVClassType,