diff --git a/easytier/src/common/global_ctx.rs b/easytier/src/common/global_ctx.rs
index 670553b..5381581 100644
--- a/easytier/src/common/global_ctx.rs
+++ b/easytier/src/common/global_ctx.rs
@@ -142,6 +142,7 @@ impl GlobalCtx {
         let feature_flags = PeerFeatureFlag {
             kcp_input: !config_fs.get_flags().disable_kcp_input,
             no_relay_kcp: config_fs.get_flags().disable_relay_kcp,
+            support_conn_list_sync: true, // Enable selective peer list sync by default
             ..Default::default()
         };
 
diff --git a/easytier/src/peers/peer_ospf_route.rs b/easytier/src/peers/peer_ospf_route.rs
index 8694745..d294fa3 100644
--- a/easytier/src/peers/peer_ospf_route.rs
+++ b/easytier/src/peers/peer_ospf_route.rs
@@ -22,7 +22,6 @@ use petgraph::{
 use prefix_trie::PrefixMap;
 use prost::Message;
 use prost_reflect::{DynamicMessage, ReflectMessage};
-use serde::{Deserialize, Serialize};
 use tokio::{
     select,
     sync::Mutex,
@@ -40,8 +39,9 @@ use crate::{
         common::{Ipv4Inet, NatType, StunInfo},
         peer_rpc::{
             route_foreign_network_infos, route_foreign_network_summary,
-            ForeignNetworkRouteInfoEntry, ForeignNetworkRouteInfoKey, OspfRouteRpc,
-            OspfRouteRpcClientFactory, OspfRouteRpcServer, PeerIdVersion, RouteForeignNetworkInfos,
+            sync_route_info_request::ConnInfo, ForeignNetworkRouteInfoEntry,
+            ForeignNetworkRouteInfoKey, OspfRouteRpc, OspfRouteRpcClientFactory,
+            OspfRouteRpcServer, PeerIdVersion, RouteForeignNetworkInfos,
             RouteForeignNetworkSummary, RoutePeerInfo, RoutePeerInfos, SyncRouteInfoError,
             SyncRouteInfoRequest, SyncRouteInfoResponse,
         },
@@ -68,6 +68,7 @@ static UPDATE_PEER_INFO_PERIOD: Duration = Duration::from_secs(3600);
 static REMOVE_DEAD_PEER_INFO_AFTER: Duration = Duration::from_secs(3660);
 // the cost (latency between two peers) is i32, i32::MAX is large enough.
 static AVOID_RELAY_COST: usize = i32::MAX as usize;
+static FORCE_USE_CONN_LIST: AtomicBool = AtomicBool::new(true);
 
 type Version = u32;
 
@@ -233,49 +234,11 @@ impl From<RoutePeerInfo> for crate::proto::api::instance::Route {
     }
 }
 
-#[derive(Deserialize, Serialize, Clone, Debug, PartialEq)]
-struct RouteConnBitmap {
-    peer_ids: Vec<(PeerId, Version)>,
-    bitmap: Vec<u8>,
-}
-
-impl From<RouteConnBitmap> for crate::proto::peer_rpc::RouteConnBitmap {
-    fn from(val: RouteConnBitmap) -> Self {
-        crate::proto::peer_rpc::RouteConnBitmap {
-            peer_ids: val
-                .peer_ids
-                .into_iter()
-                .map(|x| PeerIdVersion {
-                    peer_id: x.0,
-                    version: x.1,
-                })
-                .collect(),
-            bitmap: val.bitmap,
-        }
-    }
-}
-
-impl From<crate::proto::peer_rpc::RouteConnBitmap> for RouteConnBitmap {
-    fn from(v: crate::proto::peer_rpc::RouteConnBitmap) -> Self {
-        RouteConnBitmap {
-            peer_ids: v
-                .peer_ids
-                .into_iter()
-                .map(|x| (x.peer_id, x.version))
-                .collect(),
-            bitmap: v.bitmap,
-        }
-    }
-}
+type RouteConnBitmap = crate::proto::peer_rpc::RouteConnBitmap;
+type RouteConnPeerList = crate::proto::peer_rpc::RouteConnPeerList;
+type PeerConnInfo = crate::proto::peer_rpc::route_conn_peer_list::PeerConnInfo;
 
 impl RouteConnBitmap {
-    fn new() -> Self {
-        RouteConnBitmap {
-            peer_ids: Vec::new(),
-            bitmap: Vec::new(),
-        }
-    }
-
     fn get_bit(&self, idx: usize) -> bool {
         let byte_idx = idx / 8;
         let bit_idx = idx % 8;
@@ -285,9 +248,9 @@ impl RouteConnBitmap {
 
     fn get_connected_peers(&self, peer_idx: usize) -> BTreeSet<PeerId> {
         let mut connected_peers = BTreeSet::new();
-        for (idx, (peer_id, _)) in self.peer_ids.iter().enumerate() {
+        for (idx, peer_id_version) in self.peer_ids.iter().enumerate() {
             if self.get_bit(peer_idx * self.peer_ids.len() + idx) {
-                connected_peers.insert(*peer_id);
+                connected_peers.insert(peer_id_version.peer_id);
             }
         }
         connected_peers
@@ -474,26 +437,26 @@ impl SyncedRouteInfo {
     }
 
     fn update_conn_map(&self, conn_bitmap: &RouteConnBitmap) {
-        self.fill_empty_peer_info(&conn_bitmap.peer_ids.iter().map(|x| x.0).collect());
+        self.fill_empty_peer_info(&conn_bitmap.peer_ids.iter().map(|x| x.peer_id).collect());
 
         let mut need_inc_version = false;
 
-        for (peer_idx, (peer_id, version)) in conn_bitmap.peer_ids.iter().enumerate() {
+        for (peer_idx, peer_id_version) in conn_bitmap.peer_ids.iter().enumerate() {
             let connceted_peers = conn_bitmap.get_connected_peers(peer_idx);
             self.fill_empty_peer_info(&connceted_peers);
 
             self.conn_map
-                .entry(*peer_id)
+                .entry(peer_id_version.peer_id)
                 .and_modify(|(old_conn_bitmap, old_version)| {
-                    if *version > old_version.get() {
+                    if peer_id_version.version > old_version.get() {
                         *old_conn_bitmap = connceted_peers.clone();
                         need_inc_version = true;
-                        old_version.set(*version);
+                        old_version.set(peer_id_version.version);
                     }
                 })
                 .or_insert_with(|| {
                     need_inc_version = true;
-                    (connceted_peers, (*version).into())
+                    (connceted_peers, (peer_id_version.version).into())
                 });
         }
         if need_inc_version {
@@ -501,6 +464,49 @@ impl SyncedRouteInfo {
         }
     }
 
+    fn update_conn_peer_list(&self, conn_peer_list: &RouteConnPeerList) {
+        let mut need_inc_version = false;
+
+        for peer_conn_info in &conn_peer_list.peer_conn_infos {
+            let Some(peer_id_version) = peer_conn_info.peer_id else {
+                continue;
+            };
+            let connected_peers: BTreeSet<PeerId> =
+                peer_conn_info.connected_peer_ids.iter().copied().collect();
+            let (peer_id, version) = (peer_id_version.peer_id, peer_id_version.version);
+
+            self.fill_empty_peer_info(&connected_peers);
+
+            self.conn_map
+                .entry(peer_id)
+                .and_modify(|(old_conn_bitmap, old_version)| {
+                    if version > old_version.get() {
+                        *old_conn_bitmap = connected_peers.clone();
+                        need_inc_version = true;
+                        old_version.set(version);
+                    }
+                })
+                .or_insert_with(|| {
+                    need_inc_version = true;
+                    (connected_peers, version.into())
+                });
+        }
+        if need_inc_version {
+            self.version.inc();
+        }
+    }
+
+    fn update_conn_info(&self, conn_info: &ConnInfo) {
+        match conn_info {
+            ConnInfo::ConnBitmap(conn_bitmap) => {
+                self.update_conn_map(conn_bitmap);
+            }
+            ConnInfo::ConnPeerList(conn_peer_list) => {
+                self.update_conn_peer_list(conn_peer_list);
+            }
+        }
+    }
+
     fn update_foreign_network(&self, foreign_network: &RouteForeignNetworkInfos) {
         for item in foreign_network.infos.iter().map(Clone::clone) {
             let Some(key) = item.key else {
@@ -1185,7 +1191,7 @@ struct SyncRouteSession {
     my_peer_id: PeerId,
     dst_peer_id: PeerId,
     dst_saved_peer_info_versions: DashMap<PeerId, VersionAndTouchTime>,
-    dst_saved_conn_bitmap_version: DashMap<PeerId, VersionAndTouchTime>,
+    dst_saved_conn_info_version: DashMap<PeerId, VersionAndTouchTime>,
     dst_saved_foreign_network_versions: DashMap<ForeignNetworkRouteInfoKey, VersionAndTouchTime>,
 
     my_session_id: AtomicSessionId,
@@ -1209,7 +1215,7 @@ impl SyncRouteSession {
             my_peer_id,
             dst_peer_id,
             dst_saved_peer_info_versions: DashMap::new(),
-            dst_saved_conn_bitmap_version: DashMap::new(),
+            dst_saved_conn_info_version: DashMap::new(),
             dst_saved_foreign_network_versions: DashMap::new(),
 
             my_session_id: AtomicSessionId::new(rand::random()),
@@ -1246,7 +1252,7 @@ impl SyncRouteSession {
             // never send version 0 conn bitmap to dst peer.
             return true;
         }
-        self.dst_saved_conn_bitmap_version
+        self.dst_saved_conn_info_version
             .get(&peer_id)
             .map(|v| {
                 v.touch();
@@ -1293,15 +1299,46 @@ impl SyncRouteSession {
         conn_bitmap: &RouteConnBitmap,
         dst_peer_id: PeerId,
     ) {
-        for (peer_id, version) in conn_bitmap.peer_ids.iter() {
-            if *peer_id == dst_peer_id {
+        for peer_id_version in conn_bitmap.peer_ids.iter() {
+            if peer_id_version.peer_id == dst_peer_id {
                 continue;
             }
 
-            self.dst_saved_conn_bitmap_version
-                .entry(*peer_id)
+            self.dst_saved_conn_info_version
+                .entry(peer_id_version.peer_id)
                 .or_default()
-                .set_if_larger(*version);
+                .set_if_larger(peer_id_version.version);
+        }
+    }
+
+    fn update_dst_saved_conn_peer_list_version(
+        &self,
+        conn_peer_list: &RouteConnPeerList,
+        dst_peer_id: PeerId,
+    ) {
+        for peer_conn_info in &conn_peer_list.peer_conn_infos {
+            let Some(peer_id_version) = peer_conn_info.peer_id else {
+                continue;
+            };
+            if peer_id_version.peer_id == dst_peer_id {
+                continue;
+            }
+
+            self.dst_saved_conn_info_version
+                .entry(peer_id_version.peer_id)
+                .or_default()
+                .set_if_larger(peer_id_version.version);
+        }
+    }
+
+    fn update_dst_saved_conn_info_version(&self, conn_info: &ConnInfo, dst_peer_id: PeerId) {
+        match conn_info {
+            ConnInfo::ConnBitmap(conn_bitmap) => {
+                self.update_dst_saved_conn_bitmap_version(conn_bitmap, dst_peer_id);
+            }
+            ConnInfo::ConnPeerList(peer_list) => {
+                self.update_dst_saved_conn_peer_list_version(peer_list, dst_peer_id);
+            }
         }
     }
 
@@ -1330,7 +1367,7 @@ impl SyncRouteSession {
         if session_id != self.dst_session_id.load(Ordering::Relaxed) {
             tracing::warn!(?self, ?session_id, "session id mismatch, clear saved info.");
             self.dst_session_id.store(session_id, Ordering::Relaxed);
-            self.dst_saved_conn_bitmap_version.clear();
+            self.dst_saved_conn_info_version.clear();
             self.dst_saved_peer_info_versions.clear();
         }
     }
@@ -1340,9 +1377,9 @@ impl SyncRouteSession {
             .retain(|_, v| !v.is_expired());
         self.dst_saved_peer_info_versions.shrink_to_fit();
 
-        self.dst_saved_conn_bitmap_version
+        self.dst_saved_conn_info_version
             .retain(|_, v| !v.is_expired());
-        self.dst_saved_conn_bitmap_version.shrink_to_fit();
+        self.dst_saved_conn_info_version.shrink_to_fit();
 
         self.dst_saved_foreign_network_versions
             .retain(|_, v| !v.is_expired());
@@ -1441,7 +1478,7 @@ impl PeerRouteServiceImpl {
                 group_trust_map_cache: DashMap::new(),
                 version: AtomicVersion::new(),
             },
-            cached_local_conn_map: std::sync::Mutex::new(RouteConnBitmap::new()),
+            cached_local_conn_map: std::sync::Mutex::new(RouteConnBitmap::default()),
             cached_local_conn_map_version: AtomicVersion::new(),
 
             last_update_my_foreign_network: AtomicCell::new(None),
@@ -1634,23 +1671,33 @@ impl PeerRouteServiceImpl {
             .synced_route_info
             .conn_map
             .iter()
-            .map(|x| (*x.key(), x.value().1.get()))
+            .map(|x| PeerIdVersion {
+                peer_id: *x.key(),
+                version: x.value().1.get(),
+            })
             // do not sync conn info of peers that are not reachable from any peer.
-            .filter(|p| all_dst_peer_ids.contains(&p.0) || self.route_table.peer_reachable(p.0))
+            .filter(|p| {
+                all_dst_peer_ids.contains(&p.peer_id) || self.route_table.peer_reachable(p.peer_id)
+            })
             .collect::<Vec<_>>();
 
-        let mut conn_bitmap = RouteConnBitmap::new();
-        conn_bitmap.bitmap = vec![0; (all_peer_ids.len() * all_peer_ids.len()).div_ceil(8)];
-        conn_bitmap.peer_ids = all_peer_ids;
+        let mut conn_bitmap = RouteConnBitmap {
+            bitmap: vec![0; (all_peer_ids.len() * all_peer_ids.len()).div_ceil(8)],
+            peer_ids: all_peer_ids,
+        };
 
         let all_peer_ids = &conn_bitmap.peer_ids;
-        for (peer_idx, (peer_id, _)) in all_peer_ids.iter().enumerate() {
-            let Some(connected) = self.synced_route_info.conn_map.get(peer_id) else {
+        for (peer_idx, peer_id_version) in all_peer_ids.iter().enumerate() {
+            let Some(connected) = self
+                .synced_route_info
+                .conn_map
+                .get(&peer_id_version.peer_id)
+            else {
                 continue;
             };
 
-            for (idx, (other_peer_id, _)) in all_peer_ids.iter().enumerate() {
-                if connected.0.contains(other_peer_id) {
+            for (idx, other_peer_id_version) in all_peer_ids.iter().enumerate() {
+                if connected.0.contains(&other_peer_id_version.peer_id) {
                     let bit_idx = peer_idx * all_peer_ids.len() + idx;
                     conn_bitmap.bitmap[bit_idx / 8] |= 1 << (bit_idx % 8);
                 }
@@ -1692,8 +1739,9 @@ impl PeerRouteServiceImpl {
 
     fn build_conn_bitmap(&self, session: &SyncRouteSession) -> Option<RouteConnBitmap> {
         let mut need_update = false;
-        for (peer_id, local_version) in self.cached_local_conn_map.lock().unwrap().peer_ids.iter() {
-            if session.check_saved_conn_version_update_to_date(*peer_id, *local_version) {
+        for peer_id_version in self.cached_local_conn_map.lock().unwrap().peer_ids.iter() {
+            let (peer_id, local_version) = (peer_id_version.peer_id, peer_id_version.version);
+            if session.check_saved_conn_version_update_to_date(peer_id, local_version) {
                 continue;
             }
             need_update = true;
@@ -1706,6 +1754,46 @@ impl PeerRouteServiceImpl {
         Some(self.cached_local_conn_map.lock().unwrap().clone())
     }
 
+    fn estimate_conn_bitmap_size(&self) -> usize {
+        let cached_conn_map = self.cached_local_conn_map.lock().unwrap();
+        cached_conn_map.bitmap.len()
+            + (cached_conn_map.peer_ids.len() * std::mem::size_of::<PeerIdVersion>())
+    }
+
+    fn build_conn_peer_list(
+        &self,
+        session: &SyncRouteSession,
+        estimated_size: &mut usize,
+    ) -> Option<RouteConnPeerList> {
+        let mut peer_conn_infos = Vec::new();
+        let cached_conn_map = self.cached_local_conn_map.lock().unwrap();
+        *estimated_size = 0;
+
+        for peer_id_version in cached_conn_map.peer_ids.iter() {
+            let (peer_id, local_version) = (peer_id_version.peer_id, peer_id_version.version);
+            if session.check_saved_conn_version_update_to_date(peer_id, local_version) {
+                continue;
+            }
+
+            let Some(connected) = self.synced_route_info.conn_map.get(&peer_id) else {
+                continue;
+            };
+
+            peer_conn_infos.push(PeerConnInfo {
+                peer_id: Some(*peer_id_version),
+                connected_peer_ids: connected.0.iter().copied().collect(),
+            });
+            *estimated_size += std::mem::size_of::<PeerIdVersion>()
+                + connected.0.len() * std::mem::size_of::<PeerId>();
+        }
+
+        if peer_conn_infos.is_empty() {
+            return None;
+        }
+
+        Some(RouteConnPeerList { peer_conn_infos })
+    }
+
     fn build_foreign_network_info(
         &self,
         session: &SyncRouteSession,
@@ -1750,16 +1838,51 @@ impl PeerRouteServiceImpl {
     fn build_sync_request(
         &self,
         session: &SyncRouteSession,
+        dst_peer_id: PeerId,
     ) -> (
         Option<Vec<RoutePeerInfo>>,
-        Option<RouteConnBitmap>,
+        Option<crate::proto::peer_rpc::sync_route_info_request::ConnInfo>,
         Option<RouteForeignNetworkInfos>,
     ) {
         let route_infos = self.build_route_info(session);
-        let conn_bitmap = self.build_conn_bitmap(session);
+        let conn_info = self.build_conn_info(session, dst_peer_id);
         let foreign_network = self.build_foreign_network_info(session);
 
-        (route_infos, conn_bitmap, foreign_network)
+        (route_infos, conn_info, foreign_network)
+    }
+
+    fn build_conn_info(
+        &self,
+        session: &SyncRouteSession,
+        dst_peer_id: PeerId,
+    ) -> Option<crate::proto::peer_rpc::sync_route_info_request::ConnInfo> {
+        // Check if destination peer supports selective peer list sync
+        let dst_supports_peer_list = self
+            .synced_route_info
+            .peer_infos
+            .get(&dst_peer_id)
+            .and_then(|p| p.feature_flag)
+            .map(|x| x.support_conn_list_sync)
+            .unwrap_or(false);
+
+        if !dst_supports_peer_list && !FORCE_USE_CONN_LIST.load(Ordering::Relaxed) {
+            // Destination peer doesn't support peer list, use bitmap format
+            return self.build_conn_bitmap(session).map(Into::into);
+        }
+
+        // Both formats are supported, choose the more efficient one
+        let mut conn_list_estimated_size = 0;
+        let peer_list = self.build_conn_peer_list(session, &mut conn_list_estimated_size);
+        let bitmap_size = self.estimate_conn_bitmap_size();
+
+        if conn_list_estimated_size < bitmap_size
+            || FORCE_USE_CONN_LIST.load(Ordering::Relaxed)
+            || peer_list.is_none()
+        {
+            peer_list.map(Into::into)
+        } else {
+            self.build_conn_bitmap(session).map(Into::into)
+        }
     }
 
     fn clear_expired_peer(&self) {
@@ -1848,9 +1971,10 @@ impl PeerRouteServiceImpl {
 
         let my_peer_id = self.my_peer_id;
 
-        let (peer_infos, conn_bitmap, foreign_network) = self.build_sync_request(&session);
+        let (peer_infos, conn_info, foreign_network) =
+            self.build_sync_request(&session, dst_peer_id);
         if peer_infos.is_none()
-            && conn_bitmap.is_none()
+            && conn_info.is_none()
             && foreign_network.is_none()
             && !session.need_sync_initiator_info.load(Ordering::Relaxed)
             && !(sync_as_initiator && session.we_are_initiator.load(Ordering::Relaxed))
@@ -1858,8 +1982,8 @@ impl PeerRouteServiceImpl {
             return true;
         }
 
-        tracing::debug!(?foreign_network, "sync_route request need send to peer. my_id {:?}, pper_id: {:?}, peer_infos: {:?}, conn_bitmap: {:?}, synced_route_info: {:?} session: {:?}",
-                       my_peer_id, dst_peer_id, peer_infos, conn_bitmap, self.synced_route_info, session);
+        tracing::debug!(?foreign_network, "sync_route request need send to peer. my_id {:?}, pper_id: {:?}, peer_infos: {:?}, conn_info: {:?}, synced_route_info: {:?} session: {:?}",
+                       my_peer_id, dst_peer_id, peer_infos, conn_info, self.synced_route_info, session);
 
         session
             .need_sync_initiator_info
@@ -1878,7 +2002,7 @@ impl PeerRouteServiceImpl {
             my_session_id: session.my_session_id.load(Ordering::Relaxed),
             is_initiator: session.we_are_initiator.load(Ordering::Relaxed),
             peer_infos: peer_infos.clone().map(|x| RoutePeerInfos { items: x }),
-            conn_bitmap: conn_bitmap.clone().map(Into::into),
+            conn_info: conn_info.clone(),
             foreign_network_infos: foreign_network.clone(),
         };
 
@@ -1934,8 +2058,9 @@ impl PeerRouteServiceImpl {
                     session.update_dst_saved_peer_info_version(peer_infos, dst_peer_id);
                 }
 
-                if let Some(conn_bitmap) = &conn_bitmap {
-                    session.update_dst_saved_conn_bitmap_version(conn_bitmap, dst_peer_id);
+                // Update session saved versions based on the connection info format used
+                if let Some(conn_info) = &conn_info {
+                    session.update_dst_saved_conn_info_version(conn_info, dst_peer_id);
                 }
 
                 if let Some(foreign_network) = &foreign_network {
@@ -2029,7 +2154,7 @@ impl OspfRouteRpc for RouteSessionManager {
         let from_session_id = request.my_session_id;
         let is_initiator = request.is_initiator;
         let peer_infos = request.peer_infos.map(|x| x.items);
-        let conn_bitmap = request.conn_bitmap.map(Into::into);
+        let conn_info = request.conn_info;
         let foreign_network = request.foreign_network_infos;
         let raw_peer_infos = if peer_infos.is_some() {
             let r = get_raw_peer_infos(&mut ctrl.get_raw_input().unwrap()).unwrap();
@@ -2046,7 +2171,7 @@ impl OspfRouteRpc for RouteSessionManager {
                 is_initiator,
                 peer_infos,
                 raw_peer_infos,
-                conn_bitmap,
+                conn_info,
                 foreign_network,
             )
             .await;
@@ -2293,7 +2418,7 @@ impl RouteSessionManager {
         is_initiator: bool,
         peer_infos: Option<Vec<RoutePeerInfo>>,
         raw_peer_infos: Option<Vec<DynamicMessage>>,
-        conn_bitmap: Option<RouteConnBitmap>,
+        conn_info: Option<crate::proto::peer_rpc::sync_route_info_request::ConnInfo>,
         foreign_network: Option<RouteForeignNetworkInfos>,
     ) -> Result<SyncRouteInfoResponse, Error> {
         let Some(service_impl) = self.service_impl.upgrade() else {
@@ -2327,9 +2452,9 @@ impl RouteSessionManager {
             need_update_route_table = true;
         }
 
-        if let Some(conn_bitmap) = &conn_bitmap {
-            service_impl.synced_route_info.update_conn_map(conn_bitmap);
-            session.update_dst_saved_conn_bitmap_version(conn_bitmap, from_peer_id);
+        if let Some(conn_info) = &conn_info {
+            service_impl.synced_route_info.update_conn_info(conn_info);
+            session.update_dst_saved_conn_info_version(conn_info, from_peer_id);
             need_update_route_table = true;
         }
 
@@ -2349,8 +2474,8 @@ impl RouteSessionManager {
         }
 
         tracing::debug!(
-            "handling sync_route_info rpc: from_peer_id: {:?}, is_initiator: {:?}, peer_infos: {:?}, conn_bitmap: {:?}, synced_route_info: {:?} session: {:?}, new_route_table: {:?}",
-            from_peer_id, is_initiator, peer_infos, conn_bitmap, service_impl.synced_route_info, session, service_impl.route_table);
+            "handling sync_route_info rpc: from_peer_id: {:?}, is_initiator: {:?}, peer_infos: {:?}, conn_info: {:?}, synced_route_info: {:?} session: {:?}, new_route_table: {:?}",
+            from_peer_id, is_initiator, peer_infos, conn_info, service_impl.synced_route_info, session, service_impl.route_table);
 
         session
             .dst_is_initiator
@@ -2715,9 +2840,9 @@ mod tests {
         peers::{
             create_packet_recv_chan,
             peer_manager::{PeerManager, RouteAlgoType},
-            peer_ospf_route::{PeerIdAndVersion, PeerRouteServiceImpl},
+            peer_ospf_route::{PeerIdAndVersion, PeerRouteServiceImpl, FORCE_USE_CONN_LIST},
             route_trait::{NextHopPolicy, Route, RouteCostCalculatorInterface},
-            tests::{connect_peer_manager, create_mock_peer_manager},
+            tests::{connect_peer_manager, create_mock_peer_manager, wait_route_appear},
         },
         proto::{
             common::NatType,
@@ -2773,8 +2898,11 @@ mod tests {
         assert!(rx1 <= max_rx);
     }
 
+    #[rstest::rstest]
     #[tokio::test]
-    async fn ospf_route_2node() {
+    async fn ospf_route_2node(#[values(true, false)] enable_conn_list_sync: bool) {
+        FORCE_USE_CONN_LIST.store(enable_conn_list_sync, Ordering::Relaxed);
+
         let p_a = create_mock_pmgr().await;
         let p_b = create_mock_pmgr().await;
         connect_peer_manager(p_a.clone(), p_b.clone()).await;
@@ -2845,8 +2973,11 @@ mod tests {
         .await;
     }
 
+    #[rstest::rstest]
     #[tokio::test]
-    async fn ospf_route_multi_node() {
+    async fn ospf_route_multi_node(#[values(true, false)] enable_conn_list_sync: bool) {
+        FORCE_USE_CONN_LIST.store(enable_conn_list_sync, Ordering::Relaxed);
+
         let p_a = create_mock_pmgr().await;
         let p_b = create_mock_pmgr().await;
         let p_c = create_mock_pmgr().await;
@@ -2976,8 +3107,10 @@ mod tests {
         }
     }
 
+    #[rstest::rstest]
     #[tokio::test]
-    async fn ospf_route_3node_disconnect() {
+    async fn ospf_route_3node_disconnect(#[values(true, false)] enable_conn_list_sync: bool) {
+        FORCE_USE_CONN_LIST.store(enable_conn_list_sync, Ordering::Relaxed);
         let p_a = create_mock_pmgr().await;
         let p_b = create_mock_pmgr().await;
         let p_c = create_mock_pmgr().await;
@@ -3019,8 +3152,10 @@ mod tests {
         }
     }
 
+    #[rstest::rstest]
     #[tokio::test]
-    async fn peer_reconnect() {
+    async fn peer_reconnect(#[values(true, false)] enable_conn_list_sync: bool) {
+        FORCE_USE_CONN_LIST.store(enable_conn_list_sync, Ordering::Relaxed);
         let p_a = create_mock_pmgr().await;
         let p_b = create_mock_pmgr().await;
         let r_a = create_mock_route(p_a.clone()).await;
@@ -3063,8 +3198,10 @@ mod tests {
         check_rpc_counter(&r_a, p_b.my_peer_id(), 2, 2);
     }
 
+    #[rstest::rstest]
     #[tokio::test]
-    async fn test_cost_calculator() {
+    async fn test_cost_calculator(#[values(true, false)] enable_conn_list_sync: bool) {
+        FORCE_USE_CONN_LIST.store(enable_conn_list_sync, Ordering::Relaxed);
         let p_a = create_mock_pmgr().await;
         let p_b = create_mock_pmgr().await;
         let p_c = create_mock_pmgr().await;
@@ -3150,8 +3287,10 @@ mod tests {
         .await;
     }
 
+    #[rstest::rstest]
     #[tokio::test]
-    async fn test_raw_peer_info() {
+    async fn test_raw_peer_info(#[values(true, false)] enable_conn_list_sync: bool) {
+        FORCE_USE_CONN_LIST.store(enable_conn_list_sync, Ordering::Relaxed);
         let mut req = SyncRouteInfoRequest::default();
         let raw_info_map: DashMap<PeerId, DynamicMessage> = DashMap::new();
 
@@ -3177,8 +3316,10 @@ mod tests {
         assert_eq!(req, req2);
     }
 
+    #[rstest::rstest]
     #[tokio::test]
-    async fn test_peer_id_map_override() {
+    async fn test_peer_id_map_override(#[values(true, false)] enable_conn_list_sync: bool) {
+        FORCE_USE_CONN_LIST.store(enable_conn_list_sync, Ordering::Relaxed);
         let p_a = create_mock_peer_manager().await;
         let p_b = create_mock_peer_manager().await;
         let p_c = create_mock_peer_manager().await;
@@ -3230,9 +3371,10 @@ mod tests {
         p_b.get_global_ctx().config.remove_proxy_cidr(proxy);
         check_route_peer_id(p_c.clone()).await;
     }
-
+    #[rstest::rstest]
     #[tokio::test]
-    async fn test_subnet_proxy_conflict() {
+    async fn test_subnet_proxy_conflict(#[values(true, false)] enable_conn_list_sync: bool) {
+        FORCE_USE_CONN_LIST.store(enable_conn_list_sync, Ordering::Relaxed);
         // Create three peer managers: A, B, C
         let p_a = create_mock_peer_manager().await;
         let p_b = create_mock_peer_manager().await;
@@ -3325,4 +3467,21 @@ mod tests {
         )
         .await;
     }
+    #[rstest::rstest]
+    #[tokio::test]
+    async fn test_connect_at_different_time(#[values(true, false)] enable_conn_list_sync: bool) {
+        FORCE_USE_CONN_LIST.store(enable_conn_list_sync, Ordering::Relaxed);
+        // Create three peer managers: A, B, C
+        let p_a = create_mock_peer_manager().await;
+        let p_b = create_mock_peer_manager().await;
+        let p_c = create_mock_peer_manager().await;
+
+        // Connect A-B-C in a line topology
+        connect_peer_manager(p_a.clone(), p_b.clone()).await;
+
+        wait_route_appear(p_a.clone(), p_b.clone()).await.unwrap();
+
+        connect_peer_manager(p_b.clone(), p_c.clone()).await;
+        wait_route_appear(p_a.clone(), p_c.clone()).await.unwrap();
+    }
 }
diff --git a/easytier/src/proto/common.proto b/easytier/src/proto/common.proto
index e59be2e..e57df32 100644
--- a/easytier/src/proto/common.proto
+++ b/easytier/src/proto/common.proto
@@ -203,6 +203,7 @@ message PeerFeatureFlag {
   bool avoid_relay_data = 2;
   bool kcp_input = 3;
   bool no_relay_kcp = 4;
+  bool support_conn_list_sync = 5;
 }
 
 enum SocketType {
diff --git a/easytier/src/proto/peer_rpc.proto b/easytier/src/proto/peer_rpc.proto
index 61644a4..2aef0d7 100644
--- a/easytier/src/proto/peer_rpc.proto
+++ b/easytier/src/proto/peer_rpc.proto
@@ -39,6 +39,14 @@ message RouteConnBitmap {
   bytes bitmap = 2;
 }
 
+message RouteConnPeerList {
+  message PeerConnInfo {
+    PeerIdVersion peer_id = 1;
+    repeated uint32 connected_peer_ids = 2;
+  }
+  repeated PeerConnInfo peer_conn_infos = 1;
+}
+
 message RoutePeerInfos { repeated RoutePeerInfo items = 1; }
 
 message ForeignNetworkRouteInfoKey {
@@ -82,7 +90,10 @@ message SyncRouteInfoRequest {
   uint64 my_session_id = 2;
   bool is_initiator = 3;
   RoutePeerInfos peer_infos = 4;
-  RouteConnBitmap conn_bitmap = 5;
+  oneof conn_info {
+    RouteConnBitmap conn_bitmap = 5;
+    RouteConnPeerList conn_peer_list = 7;
+  }
   RouteForeignNetworkInfos foreign_network_infos = 6;
 }
 
diff --git a/easytier/src/proto/peer_rpc.rs b/easytier/src/proto/peer_rpc.rs
index 6a62715..f3203ec 100644
--- a/easytier/src/proto/peer_rpc.rs
+++ b/easytier/src/proto/peer_rpc.rs
@@ -38,6 +38,18 @@ impl PeerGroupInfo {
     }
 }
 
+impl From<RouteConnBitmap> for sync_route_info_request::ConnInfo {
+    fn from(val: RouteConnBitmap) -> Self {
+        Self::ConnBitmap(val)
+    }
+}
+
+impl From<RouteConnPeerList> for sync_route_info_request::ConnInfo {
+    fn from(val: RouteConnPeerList) -> Self {
+        Self::ConnPeerList(val)
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;