diff --git a/node/file_location_cache/src/file_location_cache.rs b/node/file_location_cache/src/file_location_cache.rs
index 6e278d6..b26b51f 100644
--- a/node/file_location_cache/src/file_location_cache.rs
+++ b/node/file_location_cache/src/file_location_cache.rs
@@ -161,9 +161,7 @@ impl FileCache {
     }
 
     /// Insert the specified `announcement` into cache.
-    fn insert(&mut self, announcement: SignedAnnounceFile) {
-        let tx_id = announcement.tx_id;
-
+    fn insert(&mut self, tx_id: TxID, announcement: SignedAnnounceFile) {
         let item = self.files.entry(tx_id).or_insert_with(|| {
             AnnouncementCache::new(
                 self.config.max_entries_per_file,
@@ -290,8 +288,12 @@ impl FileLocationCache {
             shard_id: announcement.shard_id,
             num_shard: announcement.num_shard,
         };
-        self.cache.lock().insert(announcement);
         self.insert_peer_config(peer_id, shard_config);
+
+        let mut cache = self.cache.lock();
+        for tx_id in announcement.tx_ids.iter() {
+            cache.insert(*tx_id, announcement.clone());
+        }
     }
 
     pub fn get_one(&self, tx_id: TxID) -> Option<SignedAnnounceFile> {
@@ -534,7 +536,7 @@ mod tests {
     }
 
     fn assert_file(file: &SignedAnnounceFile, tx_id: TxID, peer_id: PeerId, timestamp: u32) {
-        assert_eq!(file.tx_id, tx_id);
+        assert_eq!(file.tx_ids[0], tx_id);
         assert_eq!(PeerId::from(file.peer_id.clone()), peer_id);
         assert_eq!(file.timestamp, timestamp);
     }
@@ -551,11 +553,11 @@ mod tests {
         let tx1 = TxID::random_hash(1);
         let tx2 = TxID::random_hash(2);
 
-        cache.insert(create_file_2(tx1, peer1, now - 1));
+        cache.insert(tx1, create_file_2(tx1, peer1, now - 1));
         assert_eq!(cache.total_announcements, 1);
-        cache.insert(create_file_2(tx2, peer1, now - 2));
+        cache.insert(tx2, create_file_2(tx2, peer1, now - 2));
         assert_eq!(cache.total_announcements, 2);
-        cache.insert(create_file_2(tx1, peer2, now - 3));
+        cache.insert(tx1, create_file_2(tx1, peer2, now - 3));
         assert_eq!(cache.total_announcements, 3);
 
         assert_file(&cache.pop().unwrap(), tx1, peer2, now - 3);
@@ -573,18 +575,18 @@ mod tests {
         let now = timestamp_now();
 
         let tx1 = TxID::random_hash(1);
-        cache.insert(create_file_2(tx1, PeerId::random(), now - 7));
-        cache.insert(create_file_2(tx1, PeerId::random(), now - 8));
-        cache.insert(create_file_2(tx1, PeerId::random(), now - 9));
+        cache.insert(tx1, create_file_2(tx1, PeerId::random(), now - 7));
+        cache.insert(tx1, create_file_2(tx1, PeerId::random(), now - 8));
+        cache.insert(tx1, create_file_2(tx1, PeerId::random(), now - 9));
         assert_eq!(cache.total_announcements, 3);
 
         // insert more files and cause to max entries limited
         let tx2 = TxID::random_hash(2);
-        cache.insert(create_file_2(tx2, PeerId::random(), now - 1));
+        cache.insert(tx2, create_file_2(tx2, PeerId::random(), now - 1));
         assert_all_files(cache.all(tx1).unwrap_or_default(), vec![now - 8, now - 7]);
-        cache.insert(create_file_2(tx2, PeerId::random(), now - 2));
+        cache.insert(tx2, create_file_2(tx2, PeerId::random(), now - 2));
         assert_all_files(cache.all(tx1).unwrap_or_default(), vec![now - 7]);
-        cache.insert(create_file_2(tx2, PeerId::random(), now - 3));
+        cache.insert(tx2, create_file_2(tx2, PeerId::random(), now - 3));
         assert_all_files(cache.all(tx1).unwrap_or_default(), vec![]);
 
         assert_all_files(
diff --git a/node/file_location_cache/src/lib.rs b/node/file_location_cache/src/lib.rs
index 1636868..ff12c5e 100644
--- a/node/file_location_cache/src/lib.rs
+++ b/node/file_location_cache/src/lib.rs
@@ -16,7 +16,7 @@ pub struct Config {
 impl Default for Config {
     fn default() -> Self {
         Config {
-            max_entries_total: 4096,
+            max_entries_total: 256000,
             max_entries_per_file: 4,
             entry_expiration_time_secs: 3600,
         }
diff --git a/node/file_location_cache/src/test_util.rs b/node/file_location_cache/src/test_util.rs
index 6456e37..b43f6d2 100644
--- a/node/file_location_cache/src/test_util.rs
+++ b/node/file_location_cache/src/test_util.rs
@@ -35,7 +35,7 @@ impl AnnounceFileBuilder {
         let timestamp = self.timestamp.unwrap_or_else(timestamp_now);
 
         let msg = AnnounceFile {
-            tx_id,
+            tx_ids: vec![tx_id],
             num_shard: 1,
             shard_id: 0,
             peer_id: peer_id.into(),
diff --git a/node/network/src/lib.rs b/node/network/src/lib.rs
index f30ca3c..5cc8550 100644
--- a/node/network/src/lib.rs
+++ b/node/network/src/lib.rs
@@ -95,6 +95,8 @@ pub use peer_manager::{
 };
 pub use service::{load_private_key, Context, Libp2pEvent, Service, NETWORK_KEY_FILENAME};
 
+pub const PROTOCOL_VERSION: [u8; 3] = [0, 1, 0];
+
 /// Application level requests sent to the network.
 #[derive(Debug, Clone, Copy)]
 pub enum RequestId {
diff --git a/node/network/src/types/pubsub.rs b/node/network/src/types/pubsub.rs
index 6e476a4..13f6a60 100644
--- a/node/network/src/types/pubsub.rs
+++ b/node/network/src/types/pubsub.rs
@@ -130,7 +130,7 @@ pub struct FindChunks {
 
 #[derive(Debug, Clone, PartialEq, Eq, Hash, Encode, Decode)]
 pub struct AnnounceFile {
-    pub tx_id: TxID,
+    pub tx_ids: Vec<TxID>,
     pub num_shard: usize,
     pub shard_id: usize,
     pub peer_id: WrappedPeerId,
@@ -200,12 +200,14 @@ pub type SignedAnnounceFile = SignedMessage<AnnounceFile>;
 pub type SignedAnnounceShardConfig = SignedMessage<AnnounceShardConfig>;
 pub type SignedAnnounceChunks = SignedMessage<AnnounceChunks>;
 
+type SignedAnnounceFiles = Vec<SignedAnnounceFile>;
+
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub enum PubsubMessage {
     ExampleMessage(u64),
     FindFile(FindFile),
     FindChunks(FindChunks),
-    AnnounceFile(SignedAnnounceFile),
+    AnnounceFile(Vec<SignedAnnounceFile>),
     AnnounceShardConfig(SignedAnnounceShardConfig),
     AnnounceChunks(SignedAnnounceChunks),
 }
@@ -314,7 +316,8 @@ impl PubsubMessage {
                         FindChunks::from_ssz_bytes(data).map_err(|e| format!("{:?}", e))?,
                     )),
                     GossipKind::AnnounceFile => Ok(PubsubMessage::AnnounceFile(
-                        SignedAnnounceFile::from_ssz_bytes(data).map_err(|e| format!("{:?}", e))?,
+                        SignedAnnounceFiles::from_ssz_bytes(data)
+                            .map_err(|e| format!("{:?}", e))?,
                     )),
                     GossipKind::AnnounceChunks => Ok(PubsubMessage::AnnounceChunks(
                         SignedAnnounceChunks::from_ssz_bytes(data)
diff --git a/node/router/src/batcher.rs b/node/router/src/batcher.rs
new file mode 100644
index 0000000..fc7bf05
--- /dev/null
+++ b/node/router/src/batcher.rs
@@ -0,0 +1,117 @@
+use std::{
+    collections::VecDeque,
+    sync::Arc,
+    time::{Duration, Instant},
+};
+
+use ::metrics::{Histogram, Sample};
+
+/// `Batcher` is used to handle data in batch, when `capacity` or `timeout` matches.
+pub(crate) struct Batcher<T> {
+    items: VecDeque<T>,
+    earliest_time: Option<Instant>,
+    capacity: usize,
+    timeout: Duration,
+    metrics_batch_size: Arc<dyn Histogram>,
+}
+
+impl<T> Batcher<T> {
+    pub fn new(capacity: usize, timeout: Duration, name: &str) -> Self {
+        Self {
+            items: VecDeque::with_capacity(capacity),
+            earliest_time: None,
+            capacity,
+            timeout,
+            metrics_batch_size: Sample::ExpDecay(0.015).register_with_group(
+                "router_batcher_size",
+                name,
+                1024,
+            ),
+        }
+    }
+
+    fn remove_all(&mut self) -> Option<Vec<T>> {
+        let size = self.items.len();
+        if size == 0 {
+            return None;
+        }
+
+        self.metrics_batch_size.update(size as u64);
+        self.earliest_time = None;
+
+        Some(Vec::from_iter(self.items.split_off(0).into_iter().rev()))
+    }
+
+    pub fn add(&mut self, value: T) -> Option<Vec<T>> {
+        self.add_with_time(value, Instant::now())
+    }
+
+    fn add_with_time(&mut self, value: T, now: Instant) -> Option<Vec<T>> {
+        // push at front so as to use `split_off` to remove expired items
+        self.items.push_front(value);
+        if self.earliest_time.is_none() {
+            self.earliest_time = Some(now);
+        }
+
+        // cache if not full
+        let size = self.items.len();
+        if size < self.capacity {
+            return None;
+        }
+
+        // cache is full
+        self.remove_all()
+    }
+
+    pub fn expire(&mut self) -> Option<Vec<T>> {
+        self.expire_with_time(Instant::now())
+    }
+
+    fn expire_with_time(&mut self, now: Instant) -> Option<Vec<T>> {
+        if now.duration_since(self.earliest_time?) < self.timeout {
+            None
+        } else {
+            self.remove_all()
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use std::time::{Duration, Instant};
+
+    use super::Batcher;
+
+    #[test]
+    fn test_add() {
+        let mut batcher: Batcher<usize> = Batcher::new(3, Duration::from_secs(10), "test");
+
+        assert_eq!(batcher.add(1), None);
+        assert_eq!(batcher.add(2), None);
+        assert_eq!(batcher.add(3), Some(vec![1, 2, 3]));
+        assert_eq!(batcher.items.len(), 0);
+    }
+
+    #[test]
+    fn test_expire() {
+        let mut batcher: Batcher<usize> = Batcher::new(5, Duration::from_secs(10), "test");
+
+        let now = Instant::now();
+
+        // enqueue: 1, 2, 3, 4
+        assert_eq!(batcher.add_with_time(1, now + Duration::from_secs(1)), None);
+        assert_eq!(batcher.add_with_time(2, now + Duration::from_secs(2)), None);
+        assert_eq!(batcher.add_with_time(3, now + Duration::from_secs(4)), None);
+        assert_eq!(batcher.add_with_time(4, now + Duration::from_secs(5)), None);
+
+        // expire None
+        assert_eq!(batcher.expire_with_time(now + Duration::from_secs(6)), None);
+
+        // expire all
+        assert_eq!(
+            batcher.expire_with_time(now + Duration::from_secs(13)),
+            Some(vec![1, 2, 3, 4])
+        );
+        assert_eq!(batcher.items.len(), 0);
+    }
+}
diff --git a/node/router/src/lib.rs b/node/router/src/lib.rs
index 8685f5e..5cd21c7 100644
--- a/node/router/src/lib.rs
+++ b/node/router/src/lib.rs
@@ -1,6 +1,7 @@
 #[macro_use]
 extern crate tracing;
 
+mod batcher;
 mod libp2p_event_handler;
 mod metrics;
 mod peer_manager;
@@ -25,6 +26,15 @@ pub struct Config {
     pub libp2p_nodes: Vec<Multiaddr>,
     pub private_ip_enabled: bool,
     pub check_announced_ip: bool,
+
+    // batcher
+    /// Timeout to publish messages in batch
+    #[serde(deserialize_with = "deserialize_duration")]
+    pub batcher_timeout: Duration,
+    /// Number of files in an announcement
+    pub batcher_file_capacity: usize,
+    /// Number of announcements in a pubsub message
+    pub batcher_announcement_capacity: usize,
 }
 
 impl Default for Config {
@@ -37,6 +47,10 @@ impl Default for Config {
             libp2p_nodes: vec![],
             private_ip_enabled: false,
             check_announced_ip: false,
+
+            batcher_timeout: Duration::from_secs(1),
+            batcher_file_capacity: 1,
+            batcher_announcement_capacity: 1,
         }
     }
 }
diff --git a/node/router/src/libp2p_event_handler.rs b/node/router/src/libp2p_event_handler.rs
index 1ca73c0..05619b4 100644
--- a/node/router/src/libp2p_event_handler.rs
+++ b/node/router/src/libp2p_event_handler.rs
@@ -23,6 +23,7 @@ use sync::{SyncMessage, SyncSender};
 use tokio::sync::mpsc::UnboundedSender;
 use tokio::sync::{mpsc, RwLock};
 
+use crate::batcher::Batcher;
 use crate::metrics;
 use crate::peer_manager::PeerManager;
 use crate::Config;
@@ -94,6 +95,10 @@ pub struct Libp2pEventHandler {
     file_location_cache: Arc<FileLocationCache>,
     /// All connected peers.
     peers: Arc<RwLock<PeerManager>>,
+    /// Files to announce in batch
+    file_batcher: RwLock<Batcher<TxID>>,
+    /// Announcements to publish in batch
+    announcement_batcher: RwLock<Batcher<SignedAnnounceFile>>,
 }
 
 impl Libp2pEventHandler {
@@ -109,6 +114,18 @@ impl Libp2pEventHandler {
         file_location_cache: Arc<FileLocationCache>,
         peers: Arc<RwLock<PeerManager>>,
     ) -> Self {
+        let file_batcher = RwLock::new(Batcher::new(
+            config.batcher_file_capacity,
+            config.batcher_timeout,
+            "file",
+        ));
+
+        let announcement_batcher = RwLock::new(Batcher::new(
+            config.batcher_announcement_capacity,
+            config.batcher_timeout,
+            "announcement",
+        ));
+
         Self {
             config,
             network_globals,
@@ -119,6 +136,8 @@ impl Libp2pEventHandler {
             store,
             file_location_cache,
             peers,
+            file_batcher,
+            announcement_batcher,
         }
     }
 
@@ -190,7 +209,7 @@ impl Libp2pEventHandler {
         match request {
             Request::Status(status) => {
                 self.on_status_request(peer_id, request_id, status);
-                metrics::LIBP2P_HANDLE_REQUEST_STATUS.mark(1);
+                metrics::LIBP2P_HANDLE_STATUS_REQUEST.mark(1);
             }
             Request::GetChunks(request) => {
                 self.send_to_sync(SyncMessage::RequestChunks {
@@ -198,7 +217,7 @@ impl Libp2pEventHandler {
                     request_id,
                     request,
                 });
-                metrics::LIBP2P_HANDLE_REQUEST_GET_CHUNKS.mark(1);
+                metrics::LIBP2P_HANDLE_GET_CHUNKS_REQUEST.mark(1);
             }
             Request::DataByHash(_) => {
                 // ignore
@@ -241,8 +260,8 @@ impl Libp2pEventHandler {
                 debug!(%peer_id, ?status_message, "Received Status response");
                 match request_id {
                     RequestId::Router(since) => {
-                        metrics::LIBP2P_HANDLE_RESPONSE_STATUS.mark(1);
-                        metrics::LIBP2P_HANDLE_RESPONSE_STATUS_LATENCY.update_since(since);
+                        metrics::LIBP2P_HANDLE_STATUS_RESPONSE.mark(1);
+                        metrics::LIBP2P_HANDLE_STATUS_RESPONSE_LATENCY.update_since(since);
                     }
                     _ => unreachable!("All status response belong to router"),
                 }
@@ -251,8 +270,8 @@ impl Libp2pEventHandler {
             Response::Chunks(response) => {
                 let request_id = match request_id {
                     RequestId::Sync(since, sync_id) => {
-                        metrics::LIBP2P_HANDLE_RESPONSE_GET_CHUNKS.mark(1);
-                        metrics::LIBP2P_HANDLE_RESPONSE_GET_CHUNKS_LATENCY.update_since(since);
+                        metrics::LIBP2P_HANDLE_GET_CHUNKS_RESPONSE.mark(1);
+                        metrics::LIBP2P_HANDLE_GET_CHUNKS_RESPONSE_LATENCY.update_since(since);
                         sync_id
                     }
                     _ => unreachable!("All Chunks responses belong to sync"),
@@ -305,9 +324,18 @@ impl Libp2pEventHandler {
                 metrics::LIBP2P_HANDLE_PUBSUB_FIND_CHUNKS.mark(1);
                 self.on_find_chunks(msg).await
             }
-            PubsubMessage::AnnounceFile(msg) => {
+            PubsubMessage::AnnounceFile(msgs) => {
                 metrics::LIBP2P_HANDLE_PUBSUB_ANNOUNCE_FILE.mark(1);
-                self.on_announce_file(propagation_source, msg)
+
+                for msg in msgs {
+                    match self.on_announce_file(propagation_source, msg) {
+                        MessageAcceptance::Reject => return MessageAcceptance::Reject,
+                        MessageAcceptance::Ignore => return MessageAcceptance::Ignore,
+                        _ => {}
+                    }
+                }
+
+                MessageAcceptance::Accept
             }
             PubsubMessage::AnnounceChunks(msg) => {
                 metrics::LIBP2P_HANDLE_PUBSUB_ANNOUNCE_CHUNKS.mark(1);
@@ -382,7 +410,14 @@ impl Libp2pEventHandler {
         false
     }
 
-    pub async fn construct_announce_file_message(&self, tx_id: TxID) -> Option<PubsubMessage> {
+    pub async fn construct_announce_file_message(
+        &self,
+        tx_ids: Vec<TxID>,
+    ) -> Option<SignedAnnounceFile> {
+        if tx_ids.is_empty() {
+            return None;
+        }
+
         let peer_id = *self.network_globals.peer_id.read();
 
         let addr = self.get_listen_addr_or_add().await?;
@@ -391,7 +426,7 @@ impl Libp2pEventHandler {
         let shard_config = self.store.get_store().flow().get_shard_config();
 
         let msg = AnnounceFile {
-            tx_id,
+            tx_ids,
             num_shard: shard_config.num_shard,
             shard_id: shard_config.shard_id,
             peer_id: peer_id.into(),
@@ -402,14 +437,14 @@ impl Libp2pEventHandler {
         let mut signed = match SignedMessage::sign_message(msg, &self.local_keypair) {
             Ok(signed) => signed,
             Err(e) => {
-                error!(%tx_id.seq, %e, "Failed to sign AnnounceFile message");
+                error!(%e, "Failed to sign AnnounceFile message");
                 return None;
             }
         };
 
         signed.resend_timestamp = timestamp;
 
-        Some(PubsubMessage::AnnounceFile(signed))
+        Some(signed)
     }
 
     pub async fn construct_announce_shard_config_message(
@@ -447,10 +482,11 @@ impl Libp2pEventHandler {
         // verify timestamp
         let d = duration_since(
             timestamp,
-            metrics::LIBP2P_HANDLE_PUBSUB_LATENCY_FIND_FILE.clone(),
+            metrics::LIBP2P_HANDLE_PUBSUB_FIND_FILE_LATENCY.clone(),
         );
         if d < TOLERABLE_DRIFT.neg() || d > *FIND_FILE_TIMEOUT {
             debug!(%timestamp, ?d, "Invalid timestamp, ignoring FindFile message");
+            metrics::LIBP2P_HANDLE_PUBSUB_FIND_FILE_TIMEOUT.mark(1);
             return MessageAcceptance::Ignore;
         }
 
@@ -460,14 +496,10 @@ impl Libp2pEventHandler {
                 if tx.id() == tx_id {
                     trace!(?tx_id, "Found file locally, responding to FindFile query");
 
-                    return match self.construct_announce_file_message(tx_id).await {
-                        Some(msg) => {
-                            self.publish(msg);
-                            MessageAcceptance::Ignore
-                        }
-                        // propagate FindFile query to other nodes
-                        None => MessageAcceptance::Accept,
-                    };
+                    if self.publish_file(tx_id).await.is_some() {
+                        metrics::LIBP2P_HANDLE_PUBSUB_FIND_FILE_STORE.mark(1);
+                        return MessageAcceptance::Ignore;
+                    }
                 }
             }
         }
@@ -477,12 +509,15 @@ impl Libp2pEventHandler {
             trace!(?tx_id, "Found file in cache, responding to FindFile query");
 
             msg.resend_timestamp = timestamp_now();
-            self.publish(PubsubMessage::AnnounceFile(msg));
+            self.publish_announcement(msg).await;
+
+            metrics::LIBP2P_HANDLE_PUBSUB_FIND_FILE_CACHE.mark(1);
 
             return MessageAcceptance::Ignore;
         }
 
         // propagate FindFile query to other nodes
+        metrics::LIBP2P_HANDLE_PUBSUB_FIND_FILE_FORWARD.mark(1);
         MessageAcceptance::Accept
     }
 
@@ -528,7 +563,7 @@ impl Libp2pEventHandler {
         // verify timestamp
         let d = duration_since(
             msg.timestamp,
-            metrics::LIBP2P_HANDLE_PUBSUB_LATENCY_FIND_CHUNKS.clone(),
+            metrics::LIBP2P_HANDLE_PUBSUB_FIND_CHUNKS_LATENCY.clone(),
         );
         if d < TOLERABLE_DRIFT.neg() || d > *FIND_FILE_TIMEOUT {
             debug!(%msg.timestamp, ?d, "Invalid timestamp, ignoring FindChunks message");
@@ -624,6 +659,9 @@ impl Libp2pEventHandler {
         propagation_source: PeerId,
         msg: SignedAnnounceFile,
     ) -> MessageAcceptance {
+        metrics::LIBP2P_HANDLE_PUBSUB_ANNOUNCE_FILE_ANNOUNCEMENTS.mark(1);
+        metrics::LIBP2P_HANDLE_PUBSUB_ANNOUNCE_FILE_FILES.mark(msg.tx_ids.len());
+
         // verify message signature
         if !verify_signature(&msg, &msg.peer_id, propagation_source) {
             return MessageAcceptance::Reject;
@@ -646,19 +684,22 @@ impl Libp2pEventHandler {
         // propagate gossip to peers
         let d = duration_since(
             msg.resend_timestamp,
-            metrics::LIBP2P_HANDLE_PUBSUB_LATENCY_ANNOUNCE_FILE.clone(),
+            metrics::LIBP2P_HANDLE_PUBSUB_ANNOUNCE_FILE_LATENCY.clone(),
         );
         if d < TOLERABLE_DRIFT.neg() || d > *ANNOUNCE_FILE_TIMEOUT {
             debug!(%msg.resend_timestamp, ?d, "Invalid resend timestamp, ignoring AnnounceFile message");
+            metrics::LIBP2P_HANDLE_PUBSUB_ANNOUNCE_FILE_TIMEOUT.mark(1);
             return MessageAcceptance::Ignore;
         }
 
         // notify sync layer
-        self.send_to_sync(SyncMessage::AnnounceFileGossip {
-            tx_id: msg.tx_id,
-            peer_id: msg.peer_id.clone().into(),
-            addr,
-        });
+        for tx_id in msg.tx_ids.iter() {
+            self.send_to_sync(SyncMessage::AnnounceFileGossip {
+                tx_id: *tx_id,
+                peer_id: msg.peer_id.clone().into(),
+                addr: addr.clone(),
+            });
+        }
 
         // insert message to cache
         self.file_location_cache.insert(msg);
@@ -693,7 +734,7 @@ impl Libp2pEventHandler {
         // propagate gossip to peers
         let d = duration_since(
             msg.resend_timestamp,
-            metrics::LIBP2P_HANDLE_PUBSUB_LATENCY_ANNOUNCE_SHARD.clone(),
+            metrics::LIBP2P_HANDLE_PUBSUB_ANNOUNCE_SHARD_LATENCY.clone(),
         );
         if d < TOLERABLE_DRIFT.neg() || d > *ANNOUNCE_SHARD_CONFIG_TIMEOUT {
             debug!(%msg.resend_timestamp, ?d, "Invalid resend timestamp, ignoring AnnounceShardConfig message");
@@ -745,7 +786,7 @@ impl Libp2pEventHandler {
         // propagate gossip to peers
         let d = duration_since(
             msg.resend_timestamp,
-            metrics::LIBP2P_HANDLE_PUBSUB_LATENCY_ANNOUNCE_CHUNKS.clone(),
+            metrics::LIBP2P_HANDLE_PUBSUB_ANNOUNCE_CHUNKS_LATENCY.clone(),
         );
         if d < TOLERABLE_DRIFT.neg() || d > *ANNOUNCE_FILE_TIMEOUT {
             debug!(%msg.resend_timestamp, ?d, "Invalid resend timestamp, ignoring AnnounceChunks message");
@@ -774,6 +815,39 @@ impl Libp2pEventHandler {
             })
         }
     }
+
+    pub async fn publish_file(&self, tx_id: TxID) -> Option<bool> {
+        match self.file_batcher.write().await.add(tx_id) {
+            Some(batch) => {
+                let announcement = self.construct_announce_file_message(batch).await?;
+                Some(self.publish_announcement(announcement).await)
+            }
+            None => Some(false),
+        }
+    }
+
+    async fn publish_announcement(&self, announcement: SignedAnnounceFile) -> bool {
+        match self.announcement_batcher.write().await.add(announcement) {
+            Some(batch) => {
+                self.publish(PubsubMessage::AnnounceFile(batch));
+                true
+            }
+            None => false,
+        }
+    }
+
+    /// Publish expired file announcements.
+    pub async fn expire_batcher(&self) {
+        if let Some(batch) = self.file_batcher.write().await.expire() {
+            if let Some(announcement) = self.construct_announce_file_message(batch).await {
+                self.publish_announcement(announcement).await;
+            }
+        }
+
+        if let Some(batch) = self.announcement_batcher.write().await.expire() {
+            self.publish(PubsubMessage::AnnounceFile(batch));
+        }
+    }
 }
 
 #[cfg(test)]
@@ -895,7 +969,7 @@ mod tests {
                 Ok(NetworkMessage::Publish { messages }) => {
                     assert_eq!(messages.len(), 1);
                     assert!(
-                        matches!(&messages[0], PubsubMessage::AnnounceFile(file) if file.tx_id == expected_tx_id)
+                        matches!(&messages[0], PubsubMessage::AnnounceFile(files) if files[0].tx_ids[0] == expected_tx_id)
                     );
                 }
                 Ok(_) => panic!("Unexpected network message type received"),
@@ -1185,18 +1259,13 @@ mod tests {
         let tx_id = TxID::random_hash(412);
 
         // change signed message
-        let message = match handler
-            .construct_announce_file_message(tx_id)
+        let mut file = handler
+            .construct_announce_file_message(vec![tx_id])
             .await
-            .unwrap()
-        {
-            PubsubMessage::AnnounceFile(mut file) => {
-                let malicious_addr: Multiaddr = "/ip4/127.0.0.38/tcp/30000".parse().unwrap();
-                file.inner.at = malicious_addr.into();
-                PubsubMessage::AnnounceFile(file)
-            }
-            _ => panic!("Unexpected pubsub message type"),
-        };
+            .unwrap();
+        let malicious_addr: Multiaddr = "/ip4/127.0.0.38/tcp/30000".parse().unwrap();
+        file.inner.at = malicious_addr.into();
+        let message = PubsubMessage::AnnounceFile(vec![file]);
 
         // failed to verify signature
         let result = handler.on_pubsub_message(alice, bob, &id, message).await;
@@ -1212,7 +1281,11 @@ mod tests {
         let (alice, bob) = (PeerId::random(), PeerId::random());
         let id = MessageId::new(b"dummy message");
         let tx = TxID::random_hash(412);
-        let message = handler.construct_announce_file_message(tx).await.unwrap();
+        let message = handler
+            .construct_announce_file_message(vec![tx])
+            .await
+            .unwrap();
+        let message = PubsubMessage::AnnounceFile(vec![message]);
 
         // succeeded to handle
         let result = handler.on_pubsub_message(alice, bob, &id, message).await;
diff --git a/node/router/src/metrics.rs b/node/router/src/metrics.rs
index 282029b..03c3081 100644
--- a/node/router/src/metrics.rs
+++ b/node/router/src/metrics.rs
@@ -23,32 +23,55 @@ lazy_static::lazy_static! {
     pub static ref SERVICE_EXPIRED_PEERS_DISCONNECT_FAIL: Arc<dyn Histogram> = Sample::ExpDecay(0.015).register("router_service_expired_peers_disconnect_fail", 1024);
 
     // libp2p_event_handler
-    pub static ref LIBP2P_SEND_STATUS: Arc<dyn Meter> = register_meter("router_libp2p_send_status");
 
+    // libp2p_event_handler: peer connection
     pub static ref LIBP2P_HANDLE_PEER_CONNECTED_OUTGOING: Arc<dyn Meter> = register_meter_with_group("router_libp2p_handle_peer_connected", "outgoing");
     pub static ref LIBP2P_HANDLE_PEER_CONNECTED_INCOMING: Arc<dyn Meter> = register_meter_with_group("router_libp2p_handle_peer_connected", "incoming");
     pub static ref LIBP2P_HANDLE_PEER_DISCONNECTED: Arc<dyn Meter> = register_meter("router_libp2p_handle_peer_disconnected");
-    pub static ref LIBP2P_HANDLE_REQUEST_STATUS: Arc<dyn Meter> = register_meter("router_libp2p_handle_request_status");
-    pub static ref LIBP2P_HANDLE_REQUEST_GET_CHUNKS: Arc<dyn Meter> = register_meter("router_libp2p_handle_request_get_chunks");
-    pub static ref LIBP2P_HANDLE_RESPONSE_STATUS: Arc<dyn Meter> = register_meter_with_group("router_libp2p_handle_response_status", "qps");
-    pub static ref LIBP2P_HANDLE_RESPONSE_STATUS_LATENCY: Arc<dyn Histogram> = Sample::ExpDecay(0.015).register_with_group("router_libp2p_handle_response_status", "latency", 1024);
-    pub static ref LIBP2P_HANDLE_RESPONSE_GET_CHUNKS: Arc<dyn Meter> = register_meter_with_group("router_libp2p_handle_response_get_chunks", "qps");
-    pub static ref LIBP2P_HANDLE_RESPONSE_GET_CHUNKS_LATENCY: Arc<dyn Histogram> = Sample::ExpDecay(0.015).register_with_group("router_libp2p_handle_response_get_chunks", "latency", 1024);
+
+    // libp2p_event_handler: status
+    pub static ref LIBP2P_SEND_STATUS: Arc<dyn Meter> = register_meter("router_libp2p_send_status");
+    pub static ref LIBP2P_HANDLE_STATUS_REQUEST: Arc<dyn Meter> = register_meter("router_libp2p_handle_status_request");
+    pub static ref LIBP2P_HANDLE_STATUS_RESPONSE: Arc<dyn Meter> = register_meter_with_group("router_libp2p_handle_status_response", "qps");
+    pub static ref LIBP2P_HANDLE_STATUS_RESPONSE_LATENCY: Arc<dyn Histogram> = Sample::ExpDecay(0.015).register_with_group("router_libp2p_handle_status_response", "latency", 1024);
+
+    // libp2p_event_handler: get chunks
+    pub static ref LIBP2P_HANDLE_GET_CHUNKS_REQUEST: Arc<dyn Meter> = register_meter("router_libp2p_handle_get_chunks_request");
+    pub static ref LIBP2P_HANDLE_GET_CHUNKS_RESPONSE: Arc<dyn Meter> = register_meter_with_group("router_libp2p_handle_get_chunks_response", "qps");
+    pub static ref LIBP2P_HANDLE_GET_CHUNKS_RESPONSE_LATENCY: Arc<dyn Histogram> = Sample::ExpDecay(0.015).register_with_group("router_libp2p_handle_get_chunks_response", "latency", 1024);
+
+    // libp2p_event_handler: rpc errors
     pub static ref LIBP2P_HANDLE_RESPONSE_ERROR: Arc<dyn Meter> = register_meter_with_group("router_libp2p_handle_response_error", "qps");
     pub static ref LIBP2P_HANDLE_RESPONSE_ERROR_LATENCY: Arc<dyn Histogram> = Sample::ExpDecay(0.015).register_with_group("router_libp2p_handle_response_error", "latency", 1024);
-    pub static ref LIBP2P_HANDLE_PUBSUB_FIND_FILE: Arc<dyn Meter> = register_meter("router_libp2p_handle_pubsub_find_file");
-    pub static ref LIBP2P_HANDLE_PUBSUB_FIND_CHUNKS: Arc<dyn Meter> = register_meter("router_libp2p_handle_pubsub_find_chunks");
-    pub static ref LIBP2P_HANDLE_PUBSUB_ANNOUNCE_FILE: Arc<dyn Meter> = register_meter("router_libp2p_handle_pubsub_announce_file");
-    pub static ref LIBP2P_HANDLE_PUBSUB_ANNOUNCE_CHUNKS: Arc<dyn Meter> = register_meter("router_libp2p_handle_pubsub_announce_chunks");
-    pub static ref LIBP2P_HANDLE_PUBSUB_ANNOUNCE_SHARD: Arc<dyn Meter> = register_meter("router_libp2p_handle_pubsub_announce_shard");
 
-    pub static ref LIBP2P_HANDLE_PUBSUB_LATENCY_FIND_FILE: Arc<dyn Histogram> = Sample::ExpDecay(0.015).register("router_libp2p_handle_pubsub_latency_find_file", 1024);
-    pub static ref LIBP2P_HANDLE_PUBSUB_LATENCY_FIND_CHUNKS: Arc<dyn Histogram> = Sample::ExpDecay(0.015).register("router_libp2p_handle_pubsub_latency_find_chunks", 1024);
-    pub static ref LIBP2P_HANDLE_PUBSUB_LATENCY_ANNOUNCE_FILE: Arc<dyn Histogram> = Sample::ExpDecay(0.015).register("router_libp2p_handle_pubsub_latency_announce_file", 1024);
-    pub static ref LIBP2P_HANDLE_PUBSUB_LATENCY_ANNOUNCE_CHUNKS: Arc<dyn Histogram> = Sample::ExpDecay(0.015).register("router_libp2p_handle_pubsub_latency_announce_chunks", 1024);
-    pub static ref LIBP2P_HANDLE_PUBSUB_LATENCY_ANNOUNCE_SHARD: Arc<dyn Histogram> = Sample::ExpDecay(0.015).register("router_libp2p_handle_pubsub_latency_announce_shard", 1024);
+    // libp2p_event_handler: find & announce file
+    pub static ref LIBP2P_HANDLE_PUBSUB_FIND_FILE: Arc<dyn Meter> = register_meter_with_group("router_libp2p_handle_pubsub_find_file", "qps");
+    pub static ref LIBP2P_HANDLE_PUBSUB_FIND_FILE_LATENCY: Arc<dyn Histogram> = Sample::ExpDecay(0.015).register_with_group("router_libp2p_handle_pubsub_find_file", "latency", 1024);
+    pub static ref LIBP2P_HANDLE_PUBSUB_FIND_FILE_TIMEOUT: Arc<dyn Meter> = register_meter_with_group("router_libp2p_handle_pubsub_find_file", "timeout");
+    pub static ref LIBP2P_HANDLE_PUBSUB_FIND_FILE_STORE: Arc<dyn Meter> = register_meter_with_group("router_libp2p_handle_pubsub_find_file", "store");
+    pub static ref LIBP2P_HANDLE_PUBSUB_FIND_FILE_CACHE: Arc<dyn Meter> = register_meter_with_group("router_libp2p_handle_pubsub_find_file", "cache");
+    pub static ref LIBP2P_HANDLE_PUBSUB_FIND_FILE_FORWARD: Arc<dyn Meter> = register_meter_with_group("router_libp2p_handle_pubsub_find_file", "forward");
+    pub static ref LIBP2P_HANDLE_PUBSUB_ANNOUNCE_FILE: Arc<dyn Meter> = register_meter_with_group("router_libp2p_handle_pubsub_announce_file", "qps");
+    pub static ref LIBP2P_HANDLE_PUBSUB_ANNOUNCE_FILE_LATENCY: Arc<dyn Histogram> = Sample::ExpDecay(0.015).register_with_group("router_libp2p_handle_pubsub_announce_file", "latency", 1024);
+    pub static ref LIBP2P_HANDLE_PUBSUB_ANNOUNCE_FILE_TIMEOUT: Arc<dyn Meter> = register_meter_with_group("router_libp2p_handle_pubsub_announce_file", "timeout");
+    pub static ref LIBP2P_HANDLE_PUBSUB_ANNOUNCE_FILE_ANNOUNCEMENTS: Arc<dyn Meter> = register_meter_with_group("router_libp2p_handle_pubsub_announce_file", "announcements");
+    pub static ref LIBP2P_HANDLE_PUBSUB_ANNOUNCE_FILE_FILES: Arc<dyn Meter> = register_meter_with_group("router_libp2p_handle_pubsub_announce_file", "files");
 
+    // libp2p_event_handler: find & announce chunks
+    pub static ref LIBP2P_HANDLE_PUBSUB_FIND_CHUNKS: Arc<dyn Meter> = register_meter_with_group("router_libp2p_handle_pubsub_find_chunks", "qps");
+    pub static ref LIBP2P_HANDLE_PUBSUB_FIND_CHUNKS_LATENCY: Arc<dyn Histogram> = Sample::ExpDecay(0.015).register_with_group("router_libp2p_handle_pubsub_find_chunks", "latency", 1024);
+    pub static ref LIBP2P_HANDLE_PUBSUB_ANNOUNCE_CHUNKS: Arc<dyn Meter> = register_meter_with_group("router_libp2p_handle_pubsub_announce_chunks", "qps");
+    pub static ref LIBP2P_HANDLE_PUBSUB_ANNOUNCE_CHUNKS_LATENCY: Arc<dyn Histogram> = Sample::ExpDecay(0.015).register_with_group("router_libp2p_handle_pubsub_announce_chunks", "latency", 1024);
+
+    // libp2p_event_handler: announce shard config
+    pub static ref LIBP2P_HANDLE_PUBSUB_ANNOUNCE_SHARD: Arc<dyn Meter> = register_meter_with_group("router_libp2p_handle_pubsub_announce_shard", "qps");
+    pub static ref LIBP2P_HANDLE_PUBSUB_ANNOUNCE_SHARD_LATENCY: Arc<dyn Histogram> = Sample::ExpDecay(0.015).register_with_group("router_libp2p_handle_pubsub_announce_shard", "latency", 1024);
+
+    // libp2p_event_handler: verify IP address
     pub static ref LIBP2P_VERIFY_ANNOUNCED_IP: Arc<dyn Meter> = register_meter("router_libp2p_verify_announced_ip");
     pub static ref LIBP2P_VERIFY_ANNOUNCED_IP_UNSEEN: Arc<dyn Meter> = register_meter("router_libp2p_verify_announced_ip_unseen");
     pub static ref LIBP2P_VERIFY_ANNOUNCED_IP_MISMATCH: Arc<dyn Meter> = register_meter("router_libp2p_verify_announced_ip_mismatch");
+
+    // batcher
+    pub static ref BATCHER_ANNOUNCE_FILE_SIZE: Arc<dyn Histogram> = Sample::ExpDecay(0.015).register("router_batcher_announce_file_size", 1024);
 }
diff --git a/node/router/src/service.rs b/node/router/src/service.rs
index 11d04f9..938c2c3 100644
--- a/node/router/src/service.rs
+++ b/node/router/src/service.rs
@@ -95,7 +95,8 @@ impl RouterService {
     }
 
     async fn main(mut self, mut shutdown_sender: Sender<ShutdownReason>) {
-        let mut heartbeat = interval(self.config.heartbeat_interval);
+        let mut heartbeat_service = interval(self.config.heartbeat_interval);
+        let mut heartbeat_batcher = interval(self.config.batcher_timeout);
 
         loop {
             tokio::select! {
@@ -107,8 +108,11 @@ impl RouterService {
 
                 Some(msg) = Self::try_recv(&mut self.pruner_recv) => self.on_pruner_msg(msg).await,
 
-                // heartbeat
-                _ = heartbeat.tick() => self.on_heartbeat().await,
+                // heartbeat for service
+                _ = heartbeat_service.tick() => self.on_heartbeat().await,
+
+                // heartbeat for expire file batcher
+                _ = heartbeat_batcher.tick() => self.libp2p_event_handler.expire_batcher().await,
             }
         }
     }
@@ -324,12 +328,12 @@ impl RouterService {
                 }
             }
             NetworkMessage::AnnounceLocalFile { tx_id } => {
-                if let Some(msg) = self
+                if self
                     .libp2p_event_handler
-                    .construct_announce_file_message(tx_id)
+                    .publish_file(tx_id)
                     .await
+                    .is_some()
                 {
-                    self.libp2p_event_handler.publish(msg);
                     metrics::SERVICE_ROUTE_NETWORK_MESSAGE_ANNOUNCE_LOCAL_FILE.mark(1);
                 }
             }
diff --git a/node/shared_types/src/lib.rs b/node/shared_types/src/lib.rs
index 76e2903..11340c5 100644
--- a/node/shared_types/src/lib.rs
+++ b/node/shared_types/src/lib.rs
@@ -376,4 +376,16 @@ pub struct NetworkIdentity {
 
     /// The address of the deployed Flow contract on the blockchain.
     pub flow_address: Address,
+
+    /// P2P network protocol version.
+    pub p2p_protocol_version: ProtocolVersion,
+}
+
+#[derive(
+    DeriveEncode, DeriveDecode, Clone, Debug, Default, PartialEq, Eq, Serialize, Deserialize,
+)]
+pub struct ProtocolVersion {
+    pub major: u8,
+    pub minor: u8,
+    pub build: u8,
 }
diff --git a/node/src/config/convert.rs b/node/src/config/convert.rs
index c701474..dc0113b 100644
--- a/node/src/config/convert.rs
+++ b/node/src/config/convert.rs
@@ -8,7 +8,7 @@ use miner::MinerConfig;
 use network::NetworkConfig;
 use pruner::PrunerConfig;
 use rpc::RPCConfig;
-use shared_types::NetworkIdentity;
+use shared_types::{NetworkIdentity, ProtocolVersion};
 use std::net::IpAddr;
 use std::time::Duration;
 use storage::config::ShardConfig;
@@ -41,6 +41,11 @@ impl ZgsConfig {
         network_config.network_id = NetworkIdentity {
             chain_id,
             flow_address,
+            p2p_protocol_version: ProtocolVersion {
+                major: network::PROTOCOL_VERSION[0],
+                minor: network::PROTOCOL_VERSION[1],
+                build: network::PROTOCOL_VERSION[2],
+            },
         };
 
         if !self.network_disable_discovery {
diff --git a/run/config-testnet-standard.toml b/run/config-testnet-standard.toml
index fe6b311..867ee04 100644
--- a/run/config-testnet-standard.toml
+++ b/run/config-testnet-standard.toml
@@ -218,6 +218,21 @@ reward_contract_address = "0x0496D0817BD8519e0de4894Dc379D35c35275609"
 #
 # prune_batch_wait_time_ms = 1000
 
+#######################################################################
+###                   Router Config Options                         ###
+#######################################################################
+
+[router]
+
+# Timeout to publish file announcements in batch.
+# batcher_timeout = "1s"
+
+# Number of files in an announcement to publish in batch.
+batcher_file_capacity = 10
+
+# Number of announcements in a pubsub message to publish in batch.
+batcher_announcement_capacity = 100
+
 #######################################################################
 ###                   File Sync Config Options                      ###
 #######################################################################
@@ -272,7 +287,7 @@ auto_sync_enabled = true
 # When the cache is full, the storage position information with oldest timestamp will be replaced.
 
 # Global cache capacity.
-# max_entries_total = 4096
+# max_entries_total = 256000
 
 # Location information capacity for each file.
 # max_entries_per_file = 4
diff --git a/run/config-testnet-turbo.toml b/run/config-testnet-turbo.toml
index 625621a..44f48a7 100644
--- a/run/config-testnet-turbo.toml
+++ b/run/config-testnet-turbo.toml
@@ -230,6 +230,21 @@ reward_contract_address = "0x51998C4d486F406a788B766d93510980ae1f9360"
 #
 # prune_batch_wait_time_ms = 1000
 
+#######################################################################
+###                   Router Config Options                         ###
+#######################################################################
+
+[router]
+
+# Timeout to publish file announcements in batch.
+# batcher_timeout = "1s"
+
+# Number of files in an announcement to publish in batch.
+batcher_file_capacity = 10
+
+# Number of announcements in a pubsub message to publish in batch.
+batcher_announcement_capacity = 100
+
 #######################################################################
 ###                   File Sync Config Options                      ###
 #######################################################################
@@ -284,7 +299,7 @@ auto_sync_enabled = true
 # When the cache is full, the storage position information with oldest timestamp will be replaced.
 
 # Global cache capacity.
-# max_entries_total = 4096
+# max_entries_total = 256000
 
 # Location information capacity for each file.
 # max_entries_per_file = 4
diff --git a/run/config.toml b/run/config.toml
index 76309c7..ff6a472 100644
--- a/run/config.toml
+++ b/run/config.toml
@@ -232,6 +232,21 @@
 #
 # prune_batch_wait_time_ms = 1000
 
+#######################################################################
+###                   Router Config Options                         ###
+#######################################################################
+
+# [router]
+
+# Timeout to publish file announcements in batch.
+# batcher_timeout = "1s"
+
+# Number of files in an announcement to publish in batch.
+# batcher_file_capacity = 1
+
+# Number of announcements in a pubsub message to publish in batch.
+# batcher_announcement_capacity = 1
+
 #######################################################################
 ###                   File Sync Config Options                      ###
 #######################################################################
@@ -286,7 +301,7 @@
 # When the cache is full, the storage position information with oldest timestamp will be replaced.
 
 # Global cache capacity.
-# max_entries_total = 4096
+# max_entries_total = 256000
 
 # Location information capacity for each file.
 # max_entries_per_file = 4