I need do design a solution for load balance the DLSw traffic between 4 central routers and, if this 4 routers fail (oe wan fail) all peers and circuits need to be restablished on other site with other 4 routers.
To balance the traffic I will use the DLSw circuit count. To provide fault tolerance between sites I thinking to use backup peer.
My question is, "circuit count" will work togheter with "backup peer" ?
I would like to make sure that I understand the topology. The routers in remote sites have 4 DLSw peers defined. They also have 4 backup peers defined.
If this is the case, DLSw works.
However, I would like to raise some questions. What happens if only one of the DLSw peer disconnect. (i.e. 3 DLSw peer connections stay up. Another DLSw peer connection goes to a backup site) This may create a problem for you. How often do you sync the data the mainframe in the primary site and backup site? If the data in the mainframe are not in sync while you have an outage, end users will access inconsistent data.
In another scenario, all 4 peer connections disconnect. All end users will access data from the backup host. Is there an issue there?
1. Remote routers have 8 peer connections. The cost for A, B, C, and D are lower than that of E, F, G, and H. Normally, the circuits are distributed among A, B, C, and D. Even one or more than one of A, B, C, and D goes down, the rest will take the load. If all A, B, C, and D goes down, E, F, G, and H will take all the circuits.
2. Slightly different than 1. Instead of making E, F, G, and H are permanent DLSw peer connection, make E is a backup peer for A, F is a backup peer for B, and so on.
3. Just another idea. Have you considered SNASw using HPR/IP? It may take you a while to set up on the host. However, this is the way to go because IBM has stopped selling 3746/3745. All SNI link will eventually go to HPR/IP.
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