cluster: document multiple clusters in same network

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

diff --git a/pvecm.adoc b/pvecm.adoc
index 36d18c2e55c7ff78eeef9793d1b7252d8bc641de..ca53e3cd7ba776e39cb2679fbd556260cd46cc8a 100644 (file)
--- a/pvecm.adoc
+++ b/pvecm.adoc
@@ -104,6 +104,20 @@ To check the state of your cluster use:
 
  hp1# pvecm status
 
+Multiple Clusters In Same Network
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+It is possible to create multiple clusters in the same physical or logical
+network. Each cluster must have a unique name, which is used to generate the
+cluster's multicast group address. As long as no duplicate cluster names are
+configured in one network segment, the different clusters won't interfere with
+each other.
+
+If multiple clusters operate in a single network it may be beneficial to setup
+an IGMP querier and enable IGMP Snooping in said network. This may reduce the
+load of the network significantly because multicast packets are only delivered
+to endpoints of the respective member nodes.
+
 
 Adding Nodes to the Cluster
 ---------------------------