Hi!
Either you have already a network management system that supports IP-SLA, or you write your own scripts.
A very simple implementation exists as freeware from Solarwinds at http://www.solarwinds.com/geek/geekguides/ip_sla_guide.aspx
and is called 'Free IP SLA Monitor'.
Cisco has quite good documentation about IP-SLA at
http://www.cisco.com/en/US/customer/technologies/tk648/tk362/tk920/technologies_white_paper09186a00802d5efe.html
Get the latest CISCO-RTTMON MIBs from ftp://ftp.cisco.com/pub/mibs/v2/ to get a complete view of variables available.
Either read it thru the MIB-files, or get a MIB-browser, such as the free snmpb at http://sourceforge.net/projects/snmpb/.
Use the SNMP utilities from http://www.net-snmp.org/ (or anything siliar) to get access to the IP-SLA variables of your Cisco device.
Use MRTG http://oss.oetiker.ch/mrtg/ or http://oss.oetiker.ch/rrdtool/ for graphing.
Any scripting language as glue logic might still be needed, such as Perl/Python/Ruby/Java/...
Hope, this helps.
Regards,
Chris
