[id='using-jgroups-default-stacks_{context}']
= Using the Default JGroups Stacks
{brandname} uses JGroups protocol stacks so nodes can send each other messages on dedicated cluster channels.

{brandname} provides preconfigured JGroups stacks for `UDP` and `TCP` protocols.
You can use these default stacks as a starting point for building custom cluster transport configuration that is optimized for your network requirements.

.Procedure

Do one of the following to use one of the default JGroups stacks:

* Use the `stack` attribute in your `infinispan.xml` file.
+
[source,xml,options="nowrap",subs=attributes+]
----
include::config_examples/jgroups_cluster_transport.xml[]
----

ifdef::embedded_caches[]
* Use the `addProperty()` method to set the JGroups stack file:
+
[source,java]
----
include::code_examples/ConfigureTransportDefault.java[]
----
endif::embedded_caches[]

ifdef::remote_caches[]
* Use the `cluster-stack` argument to set the JGroups stack file when {brandname} Server starts:
+
[source,sh,options="nowrap",subs=attributes+]
----
$ bin/server.sh --cluster-stack=udp
----
endif::remote_caches[]

.Verification

{brandname} logs the following message to indicate which stack it uses:

[source,options="nowrap",subs=attributes+]
----
[org.infinispan.CLUSTER] ISPN000078: Starting JGroups channel cluster with stack udp
----

//RH KCS article
ifdef::downstream[]
[role="_additional-resources"]
.Additional resources
* link:https://access.redhat.com/solutions/5608391[JGroups cluster transport configuration for {brandname} 8.x] ({RedHat} knowledgebase article)
endif::downstream[]
