I am working on a project that requires high-availability and failover protection. I just finished reading the white paper on high availability and have some design questions.
1. In a mission critical scenario, where high-availability is required, is it better to have two 6500 switches, even though the required throughput will be low (>1.5Mb/sec), to start with, or can a single 6500 with dual supervisor modules and dual fabric-enabled 10/100 switch ports be a better starting point? Question boils down to what is the MTBF for an entire 6500 (specifically, the 6506), running dual-power supplies, dual supervisor modules, and dual Ethernet cards? Are there any specifications for failure of all components on a 6500? What about the backplanes? Can they all fail at once, or if one fails, do the other two (I believe that the documents indicated that there were three separate backplanes, but I maybe mistaken), pick up the load, at a reduced speed? Would it be better, remembering that money is always at issue, to have two 6506s both with dual supervisor cards, connected in a redundant uplink model (student guide, chapter 1, page 1-16).
2. If I am not running VLANs, just wanting to switch from a host to a router, for example, on the same network, do I need an MSFC? If I want faster performance (15 - 30Mpps), then I need the MSFC, or did I misunderstand the hardware configuration? Can you use an SFM without an MSFC to increase backplane bandwidth? or, is the MSFC required?
I appreciate the help and assistance with getting some answers to these questions. All a new area to me.
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