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what is Unicast clustering ? what is multicast clustering ? Can i someone explain me the difference?

Posted on 2011-02-14
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what is Unicast clustering ? what is multicast clustering ? Can i someone explain me the difference? This is pertaining to weblogic.
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Question by:Gantagoru
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by:MajorBigDeal
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I've never used weblogic, but this is what it means in general.

1. Unicast means a that a piece of information is being forwarded to a single address. In this case, since we are at layer 2, that piece of information is a frame.  If we were talking about layer 3, we would be talking packets and IP addresses. But since we are at layer 2 we are talking frames and MAC addresses.  

2. Multicast  means that a single frame is being addressed to multiple NICs at a time.

3. Clustering is having multiple hosts connected in such a way that they share a workload.

4. Load-balancing is using the multiple hosts efficiently so that the work is distributed across them in a way that increases throughput.

Keep in mind that regardless of  which method is used, all the hosts in the cluster receive the request.  Now the cluster has to communicate inside itself to see which host will process a particular fraction of the work.

If each host has 2 NICs you can use unicast. One of the NICs will have the same MAC on all the hosts in the cluster. The other NIC will have a unique MAC so the hosts in the cluster can peer-to-peer.

If the hosts only have one NIC then you have to use multicast clustering.  Again, each host's NIC will have the same MAC address. So now when the hosts need to talk they can use multicast.

Unicast clustering is more efficient but it needs 2 NICs in each host so it is more expensive.

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by:Gantagoru
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The solution was partially correct
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