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Re: multi homing pressure
At 01:05 PM 10/19/2005, John Dupuy wrote:
It has been my experience that most needing to multihome wish to do so to avoid failures within an ISP, failures with a circuit to the ISP, and failures with routers.The key word is "might". In fact, I would posit that a Tier 2 with multiply redundant transit to all of the Tier 1s could theoretically have better connectivity than an actual Tier 1. The Tier 2 transit provides flexibility that the transit-free Tier 1s do not have. Just my opinion.For the customer with an Internet "mission critical app", being tied to a Tier 2 has it's own set of problems, which might actually be worse than being tied to a Tier 1.
I should think that with the recent L3/Cogent issue, it should be QUITE clear that multihoming requires linking to two separate backbones, or two separate regionals that buy transit from multiple backbones. Vagaries in backbone providers is high on the list, IMO, and rules out the "multihome to a single provider" approach.
The demand for multi-homing might not be as great as suspected. John