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shared features, meaning that their configurations can be shared across cluster
nodes during the joining process.
Clustering Modes
IPSO clusters have two modes of operation. Nokia provides this choice so that
IPSO clusters can work in any network environment:
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Voyager Reference Guide
In multicast mode each cluster node receives every packet sent to the
cluster and decides whether to process it based on information it receives
from the master node. If the node decides not to process the packet
(because another node is processing it), it drops the packet.
This mode usually offers better throughput because it uses the network
bandwidth more efficiently.
Multicast mode uses multicast MAC addresses for each of the nodes. If
you use this mode, routers and servers adjacent to the cluster (either
connected directly or through a switch or hub) must be able to accept
ARP replies that contain a multicast MAC address. Switches connected
directly to the cluster must be able to forward packets destined for a single
(multicast) MAC address out multiple switch ports. See
for Clustering"
for more information about the requirements for routers
and switches when using multicast mode.
Multicast clustering mode is not related to multicast routing. In fact, IPSO
clusters do not forward multicast routing traffic.
In forwarding mode the master cluster node initially receives all the
packets sent to the cluster and decides which node should process the
packet. If it decides that another node should handle the packet, it
forwards the packet to that node. Otherwise, the master processes the
packet itself.
Use forwarding mode if the routers and switches on either side of the
cluster do not support multicast MAC addresses.
"Considerations
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