[Beowulf] Cluster Diagram of 500 PC
hahn at mcmaster.ca
Wed Jul 11 15:18:10 EDT 2007
>> my question is: do switches these days have smart protocols for mapping and
>> routing in such a configuration? I know that the original spanning
> That's 802.3ad. Quick pointer:
I don't think that's what I meant. imagine instead that you have
48pt GE switches, each of which has 4x 10G extra ports. now, take
5 such switches and fully connect them (each switch has a 10G link
to each of the other 4 switches). I don't think 802.3ad helps here,
since what you want is to _avoid_ a single spanning tree, which
would necessarily have one root.
802.3ad is exactly the right thing if you simply want to stack
two such switches and want 4x10Gb inter-switch bandwidth.
I noticed that d-link appears to use 10G links for stacking, but
has a route-discovery protocol that lets them structure the switches
into a ring. I'm not sure they use this to reduce hop-count, though -
perhaps just for reliability.
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