printf("\nRouting Change Report from %s to %s (%d seconds)\nNetwork Name creat up min max del down min max chg\n", begin_time, end_time, log_end - log_start);
for(network in flappers) {
if (netname[network] == "") netname[network] = "UNREGISTERED";
# add up time to end of log, if network is still up
if (state[network] == "up") {
delta = (log_end - create[network]);
up[network] += delta;
if (delta > up_max[network]) up_max[network] = delta;