but, scan.bro has some problem in by bro(2.1).
after added scan.bro, i do 'bro check', then it printed out some errors.
i think it is incorrect fields between bro2.1 and old bro(?).
anyone have a answer?

error in /usr/local/bro-20121017/share/bro/base/frameworks/metrics/./main.bro, lines 12-15 and /usr/local/bro-20121017/share/bro/site/./scan.bro, line 259: type clash (enum and Scan::id_addr_scan)
error in /usr/local/bro-20121017/share/bro/site/./scan.bro, line 259 and /usr/local/bro-20121017/share/bro/base/frameworks/metrics/./main.bro, lines 12-15: type mismatch (Scan::id_addr_scan and enum)
error in /usr/local/bro-20121017/share/bro/site/./scan.bro, lines 259-266: argument type mismatch in function call (Metrics::add_filter(Scan::id_addr_scan, [$log=F, $pred=Scan::addr_scan_predicate, $custom_check_threshold=Scan::check_addr_scan_threshold, $trigger_custom_check_threshold=1, $threshold_crossed=Scan::addr_scan_threshold_crossed, $break_interval=Scan::conn_failed_addr_interval, $default_threshold=Scan::default_addr_scan_threshold]))
warning in /usr/local/bro-20121017/share/bro/site/./scan.bro, line 266: expression value ignored (Metrics::add_filter(Scan::id_addr_scan, [$log=F, $pred=Scan::addr_scan_predicate, $custom_check_threshold=Scan::check_addr_scan_threshold, $trigger_custom_check_threshold=1, $threshold_crossed=Scan::addr_scan_threshold_crossed, $break_interval=Scan::conn_failed_addr_interval, $default_threshold=Scan::default_addr_scan_threshold]))
error in /usr/local/bro-20121017/share/bro/base/frameworks/metrics/./main.bro, lines 12-15 and /usr/local/bro-20121017/share/bro/site/./scan.bro, line 275: type clash (enum and Scan::id_port_scan)
error in /usr/local/bro-20121017/share/bro/site/./scan.bro, line 275 and /usr/local/bro-20121017/share/bro/base/frameworks/metrics/./main.bro, lines 12-15: type mismatch (Scan::id_port_scan and enum)
error in /usr/local/bro-20121017/share/bro/site/./scan.bro, lines 275-282: argument type mismatch in function call (Metrics::add_filter(Scan::id_port_scan, [$log=F, $pred=Scan::port_scan_predicate, $threshold_crossed=Scan::port_scan_threshold_crossed, $break_interval=Scan::conn_failed_port_interval, $default_threshold=Scan::default_port_scan_threshold]))
warning in /usr/local/bro-20121017/share/bro/site/./scan.bro, line 282: expression value ignored (Metrics::add_filter(Scan::id_port_scan, [$log=F, $pred=Scan::port_scan_predicate, $threshold_crossed=Scan::port_scan_threshold_crossed, $break_interval=Scan::conn_failed_port_interval, $default_threshold=Scan::default_port_scan_threshold]))

error in /usr/local/bro-20121017/share/bro/site/./scan.bro, line 375: unknown identifier Metrics::add_unique, at or near "Metrics::add_unique"