# Percona cluster Mulitcast

**URL:** <https://forums.percona.com/t/percona-cluster-mulitcast/6735>\
**Category:** Percona XtraDB Cluster 5.x\
**Created:** [December 11, 2018, 11:14am UTC](https://forums.percona.com/t/percona-cluster-mulitcast/6735 "2018-12-11T11:14:34Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![jazikh](https://avatars.discourse-cdn.com/v4/letter/j/8edcca/32.png) [@jazikh](https://forums.percona.com/u/jazikh)\
**Post date:** [December 11, 2018, 11:14am UTC](https://forums.percona.com/t/percona-cluster-mulitcast/6735/1 "2018-12-11T11:14:34Z")

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Hello,  
Sorry for asking a very basic question.  
Does percona recommends using multicast for data replication?  
And how do we use multicast on 3 nodes cluster, do i need to use the same multicast ip on all nodes? Or different multicast ip for each node?

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**Author:** ![jazikh](https://avatars.discourse-cdn.com/v4/letter/j/8edcca/32.png) [@jazikh](https://forums.percona.com/u/jazikh)\
**Post date:** [December 12, 2018, 12:01am UTC](https://forums.percona.com/t/percona-cluster-mulitcast/6735/2 "2018-12-12T00:01:49Z")

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[przemek](https://percona.vanillacommunities.com/profile/x/x/1329) can you pls share some thoughts on this?

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**Author:** ![jazikh](https://avatars.discourse-cdn.com/v4/letter/j/8edcca/32.png) [@jazikh](https://forums.percona.com/u/jazikh)\
**Post date:** [December 12, 2018, 1:56am UTC](https://forums.percona.com/t/percona-cluster-mulitcast/6735/3 "2018-12-12T01:56:48Z")

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Also should I use both gmcast.listen\_addr=tcp://0.0.0.0:4567 and gmcast.mcast\_addr=239.192.0.12 at the same time?

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**Author:** ![przemek](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/przemek/32/3_2.png) [@przemek](https://forums.percona.com/u/przemek)\
**Post date:** [December 12, 2018, 8:54am UTC](https://forums.percona.com/t/percona-cluster-mulitcast/6735/4 "2018-12-12T08:54:49Z")

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Hello,

Yes, same address needs to be used in that variable:  
[url][http://galeracluster.com/documentation-webpages/galeraparameters.html#gmcast-mcast-addr[/url]](http://galeracluster.com/documentation-webpages/galeraparameters.html#gmcast-mcast-addr%5B/url%5D)

Multicast address is not an individual host IP address, but rather a group address. Many hosts can subscribe to that group and communicate via it. You can find more details: [url][IP multicast - Wikipedia](https://en.wikipedia.org/wiki/IP_multicast#Overview%5B/url%5D)

So, it may be pretty useful to minimize the network traffic when you have many cluster nodes. You will find good article on that here:  
[url][https://www.percona.com/blog/2013/06/05/multicast-replication-in-percona-xtradb-cluster-pxc-and-galera/[/url]](https://www.percona.com/blog/2013/06/05/multicast-replication-in-percona-xtradb-cluster-pxc-and-galera/%5B/url%5D)

You will still need regular TCP/IP for SST and IST though.