for my $router (@routers) {
    my $retries = 0;
    while ($retries <= 3) {
        my $output = `expect -f show_running_config.exp $router->[$IP]`;
        write_config($output, "$router->[$NAME].cfg"), last if ($? == 0);
    } continue {
        sleep 5;
        $retries++;
    }

    if ($retries > 3) {
        print "Failed to get config for $router->[$NAME] at $router->[$IP]: $output\n";
    }
}