few big monolithic PEs vs many small PEs

[tarko at lanparty.ee (Tarko Tikan)]

hey,

> For availability I think it is best approach to do many small edge
> devices.

This is also great for planned maintenance. ISSU has not really worked 
out for any of the vendors and with two small devices you can upgrade 
them independently.

Great for aggregation, enables you to dual-home access devices into two 
separate PEs that will never be down at the same time be it failure or 
planned maintenance (excluding the physical issues like power/cooling 
but dual-homing to two separate sites is always problematic for eyeball 
networks).

-- 
tarko