I'm I alone to find this a bit spammy?
It's a free tool that imports real router configs and apparently can
scale to simulate very large networks. That seems
seems right on-target to me.
for the record, renesys wrote the ssfnet (ssfnet.org) simulation
framework, so we respect people who do a good job of producing
high-quality simulation engines. it is most certainly not easy and if
this release is any good, i suspect it will be appreciated by those
networks large enough to still have a R&D staff to take advantage of