code: private void replicateToPeers(Action action, String appName, String id,
                                    InstanceInfo info /* optional */,
                                    InstanceStatus newStatus /* optional */, boolean isReplication) {
          Stopwatch tracer = action.getTimer().start();
          try {
              if (isReplication) {
                  numberOfReplicationsLastMin.increment();
              }
              // If it is a replication already, do not replicate again as this will create a poison replication
              if (peerEurekaNodes == Collections.EMPTY_LIST || isReplication) {
                  return;
              }
  
              for (final PeerEurekaNode node : peerEurekaNodes.getPeerEurekaNodes()) {
                  // If the url represents this host, do not replicate to yourself.
                  if (peerEurekaNodes.isThisMyUrl(node.getServiceUrl())) {
                      continue;
                  }
                  replicateInstanceActionsToPeers(action, appName, id, info, newStatus, node);
              }
          } finally {
              tracer.stop();
          }
      }
docs: Replicates all eureka actions to peer eureka nodes except for replication
  traffic to this node.