Rubens Kuhl Jr. wrote:
I have the understanding that catalyst line uses 48 bit access. Wonder where they got that from :-)There is another factor at play here which is memory bandwidth at the
lookup engine. If you have to look deeper into the packet than you can
accomplish by using single spin trough the thing that fetches x bit wide
words from the packet, youīll effectively half your packet rate.
Yes, that might explain the performance halving in some architetures (may be it's what happens with Sup 720, may be not), instead of longer lookup cycle.
So when forwarding to single end hosts, you might end up with one third of the performance of IPv4. However I have not confirmed this but you might want to bother your sales engineer.
I think they also put that in a public document, probably due to the fact that Cisco put theirs in first. I havenīt seen a document discussing structures either one uses for IPv6 but I have been told they are "different for performance reasons".Doing 8+1+1+1+1+... would seem wasteful for IPv6 with the current
address allocation scheme, are you sure thatīs whatīs used for IPv6 too?
I'm not. Juniper isn't very open about this matter, and I only got
confirmation of that for IPv4.
Pete
