diff --git a/src/xrpld/app/misc/HashRouter.h b/src/xrpld/app/misc/HashRouter.h
index 580f9bddc44..a73720c05b0 100644
--- a/src/xrpld/app/misc/HashRouter.h
+++ b/src/xrpld/app/misc/HashRouter.h
@@ -186,7 +186,7 @@ class HashRouter
 
     /** Add a suppression peer and get message's relay status.
      * Return pair:
-     * element 1: true if the peer is added.
+     * element 1: true if the key is added.
      * element 2: optional is seated to the relay time point or
      * is unseated if has not relayed yet. */
     std::pair<bool, std::optional<Stopwatch::time_point>>
diff --git a/src/xrpld/overlay/detail/PeerImp.cpp b/src/xrpld/overlay/detail/PeerImp.cpp
index 0f853aac036..d771c77e702 100644
--- a/src/xrpld/overlay/detail/PeerImp.cpp
+++ b/src/xrpld/overlay/detail/PeerImp.cpp
@@ -32,6 +32,7 @@
 #include <xrpld/overlay/detail/PeerImp.h>
 #include <xrpld/overlay/detail/ProtocolMessage.h>
 #include <xrpld/overlay/detail/Tuning.h>
+#include <xrpld/overlay/detail/ProtocolMessage.h>
 #include <xrpld/overlay/predicates.h>
 #include <xrpld/perflog/PerfLog.h>
 #include <xrpl/basics/UptimeClock.h>
@@ -40,7 +41,6 @@
 #include <xrpl/basics/safe_cast.h>
 #include <xrpl/beast/core/LexicalCast.h>
 #include <xrpl/protocol/digest.h>
-// #include <xrpl/beast/core/SemanticVersion.h>
 #include <xrpl/protocol/digest.h>
 
 #include <boost/algorithm/string/predicate.hpp>
@@ -1620,6 +1620,12 @@ PeerImp::onMessage(std::shared_ptr<protocol::TMLedgerData> const& m)
             "Invalid Ledger/TXset nodes " + std::to_string(m->nodes_size()));
     }
 
+    auto const messageHash = sha512Half(*m);
+    if (!app_.getHashRouter().addSuppressionPeer(messageHash, id_))
+    {
+        return badData("Duplicate message: " + to_string(messageHash));
+    }
+
     // If there is a request cookie, attempt to relay the message
     if (m->has_requestcookie())
     {
@@ -1636,7 +1642,6 @@ PeerImp::onMessage(std::shared_ptr<protocol::TMLedgerData> const& m)
     }
 
     uint256 const ledgerHash{m->ledgerhash()};
-
     // Otherwise check if received data for a candidate transaction set
     if (m->type() == protocol::liTS_CANDIDATE)
     {
@@ -3057,7 +3062,8 @@ PeerImp::sendToMultiple(
             foundSelf = true;
         JLOG(p_journal_.debug())
             << "sendToMultiple: Sending " << cookies.size()
-            << " TMLedgerData messages to peer[" << peer->id() << "]";
+            << " TMLedgerData messages to peer[" << peer->id()
+            << "]: " << sha512Half(ledgerData);
         for (auto const& cookie : cookies)
         {
             // Unfortunately, need a separate Message object for every
diff --git a/src/xrpld/overlay/detail/ProtocolMessage.h b/src/xrpld/overlay/detail/ProtocolMessage.h
index 16672b190bc..2e9837ebacf 100644
--- a/src/xrpld/overlay/detail/ProtocolMessage.h
+++ b/src/xrpld/overlay/detail/ProtocolMessage.h
@@ -43,6 +43,12 @@ protocolMessageType(protocol::TMGetLedger const&)
     return protocol::mtGET_LEDGER;
 }
 
+inline protocol::MessageType
+protocolMessageType(protocol::TMLedgerData const&)
+{
+    return protocol::mtLEDGER_DATA;
+}
+
 inline protocol::MessageType
 protocolMessageType(protocol::TMReplayDeltaRequest const&)
 {
@@ -519,6 +525,29 @@ hash_append(Hasher& h, TMGetLedger const& msg)
         hash_append(h, msg.querydepth());
 }
 
+template <class Hasher>
+void
+hash_append(Hasher& h, TMLedgerData const& msg)
+{
+    using beast::hash_append;
+    using namespace ripple;
+    hash_append(h, safe_cast<int>(protocolMessageType(msg)));
+    hash_append(h, msg.ledgerhash());
+    hash_append(h, msg.ledgerseq());
+    hash_append(h, safe_cast<int>(msg.type()));
+    for (auto const& node : msg.nodes())
+    {
+        hash_append(h, node.nodedata());
+        if (node.has_nodeid())
+            hash_append(h, node.nodeid());
+    }
+    hash_append(h, msg.nodes_size());
+    if (msg.has_requestcookie())
+        hash_append(h, msg.requestcookie());
+    if (msg.has_error())
+        hash_append(h, safe_cast<int>(msg.error()));
+}
+
 }  // namespace protocol
 
 #endif