diff --git a/p2p/base/connection.cc b/p2p/base/connection.cc
index 28761b5..76652db 100644
--- a/p2p/base/connection.cc
+++ b/p2p/base/connection.cc
@@ -1583,7 +1583,7 @@
   // Set the related address and foundation attributes before changing the
   // address.
   local_candidate_.set_related_address(local_candidate_.address());
-  local_candidate_.set_foundation(Port::ComputeFoundation(
+  local_candidate_.set_foundation(port()->ComputeFoundation(
       PRFLX_PORT_TYPE, local_candidate_.protocol(),
       local_candidate_.relay_protocol(), local_candidate_.address()));
   local_candidate_.set_priority(priority);
diff --git a/p2p/base/p2p_transport_channel.cc b/p2p/base/p2p_transport_channel.cc
index 02d1f32..15b1cf6 100644
--- a/p2p/base/p2p_transport_channel.cc
+++ b/p2p/base/p2p_transport_channel.cc
@@ -894,6 +894,7 @@
 
 void P2PTransportChannel::MaybeStartGathering() {
   RTC_DCHECK_RUN_ON(network_thread_);
+  // TODO(bugs.webrtc.org/14605): ensure tie_breaker_ is set.
   if (ice_parameters_.ufrag.empty() || ice_parameters_.pwd.empty()) {
     RTC_LOG(LS_ERROR)
         << "Cannot gather candidates because ICE parameters are empty"
@@ -938,6 +939,7 @@
                                       ice_parameters_.ufrag,
                                       ice_parameters_.pwd);
     if (pooled_session) {
+      pooled_session->set_ice_tiebreaker(tiebreaker_);
       AddAllocatorSession(std::move(pooled_session));
       PortAllocatorSession* raw_pooled_session =
           allocator_sessions_.back().get();
@@ -954,6 +956,7 @@
       AddAllocatorSession(allocator_->CreateSession(
           transport_name(), component(), ice_parameters_.ufrag,
           ice_parameters_.pwd));
+      allocator_sessions_.back()->set_ice_tiebreaker(tiebreaker_);
       allocator_sessions_.back()->StartGettingPorts();
     }
   }
diff --git a/p2p/base/port.cc b/p2p/base/port.cc
index 6792939..dea18a4 100644
--- a/p2p/base/port.cc
+++ b/p2p/base/port.cc
@@ -101,8 +101,10 @@
                                     absl::string_view protocol,
                                     absl::string_view relay_protocol,
                                     const rtc::SocketAddress& base_address) {
+  // TODO(bugs.webrtc.org/14605): ensure IceTiebreaker() is set.
   rtc::StringBuilder sb;
-  sb << type << base_address.ipaddr().ToString() << protocol << relay_protocol;
+  sb << type << base_address.ipaddr().ToString() << protocol << relay_protocol
+     << rtc::ToString(IceTiebreaker());
   return rtc::ToString(rtc::ComputeCrc32(sb.Release()));
 }
 
diff --git a/p2p/base/port.h b/p2p/base/port.h
index a1377a8..d746f3d 100644
--- a/p2p/base/port.h
+++ b/p2p/base/port.h
@@ -386,10 +386,10 @@
   //   then the foundation will be different.  Two candidate pairs with
   //   the same foundation pairs are likely to have similar network
   //   characteristics. Foundations are used in the frozen algorithm.
-  static std::string ComputeFoundation(absl::string_view type,
-                                       absl::string_view protocol,
-                                       absl::string_view relay_protocol,
-                                       const rtc::SocketAddress& base_address);
+  std::string ComputeFoundation(absl::string_view type,
+                                absl::string_view protocol,
+                                absl::string_view relay_protocol,
+                                const rtc::SocketAddress& base_address);
 
  protected:
   virtual void UpdateNetworkCost();
diff --git a/p2p/base/port_allocator.cc b/p2p/base/port_allocator.cc
index d22b428..522f0be 100644
--- a/p2p/base/port_allocator.cc
+++ b/p2p/base/port_allocator.cc
@@ -68,7 +68,8 @@
       content_name_(content_name),
       component_(component),
       ice_ufrag_(ice_ufrag),
-      ice_pwd_(ice_pwd) {
+      ice_pwd_(ice_pwd),
+      tiebreaker_(0) {
   // Pooled sessions are allowed to be created with empty content name,
   // component, ufrag and password.
   RTC_DCHECK(ice_ufrag.empty() == ice_pwd.empty());
@@ -99,7 +100,8 @@
       max_ipv6_networks_(kDefaultMaxIPv6Networks),
       step_delay_(kDefaultStepDelay),
       allow_tcp_listen_(true),
-      candidate_filter_(CF_ALL) {
+      candidate_filter_(CF_ALL),
+      tiebreaker_(0) {
   // The allocator will be attached to a thread in Initialize.
   thread_checker_.Detach();
 }
@@ -199,6 +201,7 @@
     PortAllocatorSession* pooled_session =
         CreateSessionInternal("", 0, iceCredentials.ufrag, iceCredentials.pwd);
     pooled_session->set_pooled(true);
+    pooled_session->set_ice_tiebreaker(tiebreaker_);
     pooled_session->StartGettingPorts();
     pooled_sessions_.push_back(
         std::unique_ptr<PortAllocatorSession>(pooled_session));
@@ -206,6 +209,13 @@
   return true;
 }
 
+void PortAllocator::SetIceTiebreaker(uint64_t tiebreaker) {
+  tiebreaker_ = tiebreaker;
+  for (auto& pooled_session : pooled_sessions_) {
+    pooled_session->set_ice_tiebreaker(tiebreaker_);
+  }
+}
+
 std::unique_ptr<PortAllocatorSession> PortAllocator::CreateSession(
     absl::string_view content_name,
     int component,
@@ -215,6 +225,7 @@
   auto session = std::unique_ptr<PortAllocatorSession>(
       CreateSessionInternal(content_name, component, ice_ufrag, ice_pwd));
   session->SetCandidateFilter(candidate_filter());
+  session->set_ice_tiebreaker(tiebreaker_);
   return session;
 }
 
diff --git a/p2p/base/port_allocator.h b/p2p/base/port_allocator.h
index 420560c..4635843 100644
--- a/p2p/base/port_allocator.h
+++ b/p2p/base/port_allocator.h
@@ -206,6 +206,10 @@
   const std::string& ice_pwd() const { return ice_pwd_; }
   bool pooled() const { return pooled_; }
 
+  // TODO(bugs.webrtc.org/14605): move this to the constructor
+  void set_ice_tiebreaker(uint64_t tiebreaker) { tiebreaker_ = tiebreaker; }
+  uint64_t ice_tiebreaker() const { return tiebreaker_; }
+
   // Setting this filter should affect not only candidates gathered in the
   // future, but candidates already gathered and ports already "ready",
   // which would be returned by ReadyCandidates() and ReadyPorts().
@@ -322,6 +326,9 @@
 
   bool pooled_ = false;
 
+  // TODO(bugs.webrtc.org/14605): move this to the constructor
+  uint64_t tiebreaker_;
+
   // SetIceParameters is an implementation detail which only PortAllocator
   // should be able to call.
   friend class PortAllocator;
@@ -374,6 +381,9 @@
                         const absl::optional<int>&
                             stun_candidate_keepalive_interval = absl::nullopt);
 
+  void SetIceTiebreaker(uint64_t tiebreaker);
+  uint64_t IceTiebreaker() const { return tiebreaker_; }
+
   const ServerAddresses& stun_servers() const {
     CheckRunOnValidThreadIfInitialized();
     return stun_servers_;
@@ -665,6 +675,9 @@
   // if ice_credentials is nullptr.
   std::vector<std::unique_ptr<PortAllocatorSession>>::const_iterator
   FindPooledSession(const IceParameters* ice_credentials = nullptr) const;
+
+  // ICE tie breaker.
+  uint64_t tiebreaker_;
 };
 
 }  // namespace cricket
diff --git a/p2p/client/basic_port_allocator.cc b/p2p/client/basic_port_allocator.cc
index 819bc51..5611403 100644
--- a/p2p/client/basic_port_allocator.cc
+++ b/p2p/client/basic_port_allocator.cc
@@ -1557,6 +1557,7 @@
   }
 
   if (port) {
+    port->SetIceTiebreaker(session_->ice_tiebreaker());
     // If shared socket is enabled, STUN candidate will be allocated by the
     // UDPPort.
     if (IsFlagSet(PORTALLOCATOR_ENABLE_SHARED_SOCKET)) {
@@ -1592,6 +1593,7 @@
       session_->allocator()->allow_tcp_listen(),
       session_->allocator()->field_trials());
   if (port) {
+    port->SetIceTiebreaker(session_->ice_tiebreaker());
     session_->AddAllocatedPort(port.release(), this);
     // Since TCPPort is not created using shared socket, `port` will not be
     // added to the dequeue.
@@ -1621,6 +1623,7 @@
       session_->allocator()->stun_candidate_keepalive_interval(),
       session_->allocator()->field_trials());
   if (port) {
+    port->SetIceTiebreaker(session_->ice_tiebreaker());
     session_->AddAllocatedPort(port.release(), this);
     // Since StunPort is not created using shared socket, `port` will not be
     // added to the dequeue.
@@ -1717,6 +1720,7 @@
       }
     }
     RTC_DCHECK(port != NULL);
+    port->SetIceTiebreaker(session_->ice_tiebreaker());
     session_->AddAllocatedPort(port.release(), this);
   }
 }
diff --git a/pc/jsep_transport_controller.cc b/pc/jsep_transport_controller.cc
index 95ab799..c3fc89a 100644
--- a/pc/jsep_transport_controller.cc
+++ b/pc/jsep_transport_controller.cc
@@ -62,6 +62,9 @@
   RTC_DCHECK(config_.ice_transport_factory);
   RTC_DCHECK(config_.on_dtls_handshake_error_);
   RTC_DCHECK(config_.field_trials);
+  if (port_allocator_) {
+    port_allocator_->SetIceTiebreaker(ice_tiebreaker_);
+  }
 }
 
 JsepTransportController::~JsepTransportController() {