WebLogic Server (WLS) Multicast Issues Support Pattern (Doc ID 1092037.1)

Last updated on APRIL 03, 2024

Applies to:

Oracle WebLogic Server - Version 6.1 and later
Information in this document applies to any platform.

Purpose

This document describes how to resolve problems associated with Multicast communication.

Problem Description

A WebLogic Server instance has problems listening to, receiving messages on, or being generally successful using multicast with Oracle WebLogic Server.

NOTE:
In WebLogic Server 10.0 and higher, Oracle recommends that you use unicast communication rather than multicast for communication within a cluster. Multicast should be used to maintain backward compatibility with earlier releases of WebLogic Server. See Communications in a Cluster for more details. This support pattern focuses only on multicast issues.

Problem Troubleshooting

Please note that not all of the following items would need to be done. Some issues can be solved by only following a few of the items.

Troubleshooting Steps

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In this Document

Problem Description

Problem Troubleshooting

Troubleshooting Steps

Why does the problem occur?

Multicast address/port issues

Physical problems/issues sharing address

Duplicate IP addresses

Testing multicast / erroneous communications

File descriptor issues

Nsswitch configuration

Multicast timeouts

Cluster heartbeat problems

Cluster multicast storm issues

Example scenario:

Background on multicast storms

Configure multicast buffer size

Multihoming configuration

AIX-specific issues

Background information

Debugging multicast

Debugging flags

Debug multicast

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