2011/10/20 Pavel Lunin <[email protected]> > Folks, let me make a tiny semi-philosophical summarization on this :) > > Any layer of hierarchy in packet networks gives you another chance to > benefit from statistical multiplexing (trick, because of which packet > switching rules). The more flows from individual users/subscribers you > aggregate in a single link/box, the less dispersion of their insensitivity > and the denser you pack the packets on a line (the more it's like TDM), > thus > the bigger the benefits.
You could do the same by just adding more links in the same layer. If you have a core layer but only two links to it that is still your bottle neck. Also MPLS doesn't do statistical multiplexing or load-balancing the same way TDM would. Most flows will follow the same path from point A to point B so even though it's packet switched it has some of the constraints of circuit switched topologies. Statistical multiplexing within a box or within the queues in a box is a different discussion. > In addition if your core serves users from > different time-zones, its efficiency will be even higher because of the > 'natural TDM' human biology creates. > lol I'm pretty sure people still use their lines at night. Backup traffic has to go somewhere. > > However you won't earn anything if the streams are already well packed > (someone has already skimmed the cream off). As Mark has mentioned, there > is > no point in selling switched vll/vpn/anything to customers who fully fill > their last-miles of capacity close to that of your core-links. Well, at > least if the number of such customers is statistically significant. This is > what L1 multiplexing is invented for. > This depends on your pricing. Hopefully those customers that are allowed to saturate the PE links are paying enough to finance bandwidth/box upgrades. Hopefully, the financials work out so that profit is made if 100 customers fill the pipes or 10 or 2 for that matter. _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
