# Enabling UDT When Creating a Network Topology

You can enable UDT (UDP-based data transfer) when creating network topology.

UDT enhances data transfer efficiency over long-distance network connections by using the UDT protocol on top of UDP. This can result in up to a 2x performance improvement on WAN links, particularly in high-latency environments. On local area networks (LANs), where latency is minimal, performance gains are generally negligible.

## Before You Begin

To use UDT, make sure UDP traffic is allowed between all source and destination clients.

## Procedure

1. From the Command Center navigation pane, go to Network > Network Topologies > Add Topology and then follow the usual steps of creating network topologies.

2. When you reach the Advanced tab, select the Enable UDT option and then click Submit.

3. Push the network configuration on the newly created topology.

4. Check the network configuration of the clients involved in the topology:

   It will show "enable_udt=1" in the [general] section and "transport=udt" in the [outgoing] section.

5. To verify if UDT is enabled:

   - Perform a service restart on all source and destination clients involved in the network topology.

   - In the cvfwd logs of the client making persistent connections, you will see the following messages:

         keyword1:

         54610 d5a8 06/23 12:15:07 ######## ######## Initialized epoll()-based I/O tracker for connecting BSD sockets

         54610 d5a8 06/23 12:15:07 ######## ######## Initialized UDT I/O tracker for connecting UDT sockets

         54610 d5a8 06/23 12:15:10 ######## ######## Initialized epoll()-based I/O tracker for receiving data from BSD sockets

         54610 d5a8 06/23 12:15:10 ######## ######## Initialized UDT I/O tracker for receiving data from UDT sockets

         54610 d5a8 06/23 12:15:10 ######## ######## Initialized epoll()-based I/O tracker for sending data via BSD sockets

         54610 d5a8 06/23 12:15:10 ######## ######## Initialized UDT I/O tracker for sending data via UDT sockets

         keyword2:

         PERSISTENT UDT tunnel from "client1" to "client2" via (ANY, IP2):

6. To disable UDT, do the following:

   - Navigate to the network topologies page.

   - Edit the existing network topology, and navigate to the Advanced Options tab.

   - De-select the Enable UDT option.

   - Push the network operation.

   - Restart services on all source and destination clients involved in the network topology.

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