From: Michael Dillon <michael@memra.com>
It really is about time that some of the larger ISP's started following
the lead of folks like netaxs.com and become aggregate providers for
local ISP's in their cities. This way the aggregator can be doubly and
triply homed and deal with all the BGP4 nastiness. The ISP's gain the
benefit of that multihoming to their city and in addition can get some of
the redundancy-in-case-of-failure by buying a T1 and frame relay, or a T1
and ISDN dialup to their aggregate provider.

Every ISP wants to have a backup connection and right now most assume
that multi-homing is the only way to achieve this.

I believe that a middle-tier between the ISP and the NSP is the best way
to achieve this and could very well decrease global routing table size.

These are often called Metropolitan Exchanges. They have been proposed
repeatedly in the IETF context. Several of them are operational around
the US, but there need to be hundreds of them.

How about you? Have you created one in _your_ metro?

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