Smart Plug-in for WebLogic Server Reference Guide

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Chapter 1
Metric B081_ClsInMesFailRt
Instruction Text (contd.) If you choose to distribute a cluster over a WAN (or across multiple subnets),
you must plan and configure your network topology to ensure that multicast
messages are reliably transmitted to all servers in the cluster. Specifically, your
network must meet the following requirements:
1) The network must fully support IP multicast packet propagation. In other
words, all routers and other tunneling technologies must be configured to
propagate multicast messages to clustered instances.
2) The network latency must be sufficiently small as to ensure that most
multicast messages reach their final destination in 200 to 300 milliseconds.
3) The multicast Time-To-Live (TTL) value must be high enough to ensure that
routers do not discard multicast packets before they reach their final destination.
Note: Distributing a WebLogic Server cluster over a WAN may require network
facilities in addition to the multicast requirements described above. For
example, you may want to configure load balancing hardware to ensure that
client requests are directed to servers in the most efficient manner (to avoid
unnecessary network hops).
Action Operator-initiated graph
Area Cluster
Monitor Template Name WLSSPI_0081