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> I mean peering speed between a single pair of ISPs at a single > exchange (or peering) point exceeds that of a single interface. > > And, if you need many, say 10, interfaces, l1 have all the > flexibilities Vadim want. > > > Layer 1 peering (or pooling, as it's more usually known) is great for > > interconnecting fiber networks, fast provisioning, and all that. > > You may say that we are not ready for full fiber networking, yet. > Any given interface is inherently rate limited. When demand exceeds the capacity, something must be done. Often this is done w/ "striping" or "muxing" where multiple "low-speed" channels are "bonded" into a single virtual path. L1 is not that different than L2 & L3 in these cases. The specific dynamics are unique per layer but the problem remains the same. --bill
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