What does the OpenAIS UDP port 5149 do?

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Issue

We can see (e.g. from lsof output) that in RHEL 5 cluster, OpenAIS (aisexec) is using UPD port 5149. Can you describe the usage of this port and if it's safe to filter it out on firewall?

Environment

Red Hat Enterprise Linux (RHEL) 5
Red Hat Enterprise Linux Cluster (RHCS) 5

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